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Old 06-06-2021, 08:11 AM   #1
mike42
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Default Fuel problem on my '40

Thank God this isn't anything about BRAKES !!

Carb if over flowing and leaking at the bottom plate. Yesterday I was getting ready to take a ride and the car started to really run rough and finally stalled out. Fuel is leaking like hell at the carb base. Took the carb apart and checked to see if there was a stuck float valve. Cleaned it up and ran for a short time and then started put and sputtering and stalled. Leakage at carb base. Took it all apart and replace the small plunger with a steel one from the original (81 years old) Ford Script Carb....assembled....ran really great for a few minutes and stalled and leakage again.

I have a Holley Fuel Reg installed.....could that have a worn component inside that would allow more fuel flow than the 3psi needed ? The regulator is about 8 years old.

See....told you wasn't anything about ...BRAKES !!!

Thx....Mike
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Old 06-06-2021, 10:15 AM   #2
19Fordy
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Default Re: Fuel problem on my '40

Mike, If you are using the stock engine, 1/4 in fuel line and stock fuel pump you don't need a fuel regulator since the pump is designed to feed correct amount of fuel to engine. If you are using the stock OEM short flexible fuel line in the fuel line near the firewall that feeds the carb remove it and examine it to see if it is in good condition. Modern gas dissolves them. Plus, they dry out and crack. That is a common problem.

I am sure others will help you also.

Last edited by 19Fordy; 06-06-2021 at 10:27 AM.
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Old 06-06-2021, 11:17 AM   #3
mike42
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Default Re: Fuel problem on my '40

Ford……..I had the reg set for about 8 years and also had the fuel pump along with electric pump. I had a mess on my hands when the pump got bad from modern fuel. I had gas all over the engine compartment ! Scared the hell out of me and glad I was close to home. Took out regular pump and using the electric only. Fuel reg set at 2.5 psi and no probs until the other day. I checked the flow coming out of the regulator and it’s a very heavy flow ! That’s why I’m thinking the guts have gone bad. I use recreational fuel now and not the regular stuff.

Thx…..Mike
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Old 06-06-2021, 11:43 AM   #4
19Fordy
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Default Re: Fuel problem on my '40

Hi Mike, What is the pressure rating of your electric pump? Is it in the low range? Also, what pump are you using and what regulator are you using? I have found those "round dial style regulators" where you set the dial on a number to be problematic when using today's gas. However, if you have used one before and it worked well you might want to install a new one rather than redesigning your fuel delivery system. You've already had a long battle with your brakes. Buy 2 regulators and keep one as a spare.
https://www.summitracing.com/parts/MRG-9710?rrec=true

I use the Holley low pressure regulator and a FACET pump.. Here's some interesting info. on Facet pumps. Notice the low pressure pump # 40163.
https://www.aircraftspruce.com/catal...facetpumps.php

The bottom line is this. Since your fuel flow was fine prior to your regulator going bad it seems that you best bet would be to install a new regulator that will tolerate modern fuel. Call Summit and ask them if their regulators can tolerate modern gas. Also, add STABIL to your gas.

Last edited by 19Fordy; 06-06-2021 at 11:57 AM.
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Old 06-06-2021, 12:53 PM   #5
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Default Re: Fuel problem on my '40

I just bought a Holley 12-881 Chrome 6psi. It'll be here next week. I have a low pressure Carter and a second one as a spare which is an Air Tech or something like that. It pumps great, but a little TOOOO great !!! I turned it on and it just gushed out !!

Thanks for the info.
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Old 06-06-2021, 02:27 PM   #6
19Fordy
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Default Re: Fuel problem on my '40

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Hi Mike, That 12881 unit is preset to 6 psi.
https://documents.holley.com/199r11227.pdf

Did you see this Holley unit that provides 1-4 psi?
https://www.summitracing.com/parts/h...gaAkxlEALw_wcB
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Old 06-06-2021, 04:04 PM   #7
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Default Re: Fuel problem on my '40

My humble opinion: Your power valve took a dump. If you order one, be sure it fits your 3 bolt carburetor.
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Old 06-06-2021, 08:44 PM   #8
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Default Re: Fuel problem on my '40

Mike I read your post this morning and it really sounds light you have your suspicions of what the problem might be. I too use the Holley regulator and the picture I attached shows the gage I bought from speedway. With this I can see just how much pressure is going to the carburetor. Good luck
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Old 06-06-2021, 08:52 PM   #9
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Default Re: Fuel problem on my '40

Pressure should in the 2 or 3 psi range, 6 is way to high. That pressure regulator will not work with most Ford flathead carberators.
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Old 06-07-2021, 05:58 AM   #10
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Default Re: Fuel problem on my '40

Oh crap.....I thought I could adjust up to 6 psi. I'll cancel Amazon this morning. Glad I caught this from you guys. Thx !!!!!!!!!

Bo....do you mean power valve in Carb ??

Forty I'll check out Summit this morning and thx again !

Ken .....I also bought the gauge when I installed the Regulator. If I could ever learn how to post phots I'd show you my set up !!

Seery....I had my Reg set at 2.5psi for about 8 years and then all of a sudden I have a problem. Maybe it is the power valve. I'm going to check that you.

Have a fine day guys.....got to get online and cancel the 6psi Reg.

Thx all again....

Mike
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Old 06-07-2021, 06:04 AM   #11
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Default Re: Fuel problem on my '40

Fordy.....I was able to cancel in-time !!

Thx very much !
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Old 06-07-2021, 06:31 AM   #12
Terry,OH
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Default Re: Fuel problem on my '40

Use regular pump fuel 87 octane. no need for special fuels. Some guys like to add some MMO or Extend if necessary.
If you want to change the input valve change both pieces together, not just the needle. Before changing the input valve, tap the steel needle into the brass seat with a small hammer so the two seat properly.

It is possible the Carb. power valve diaphragm is ruptured, if so your engine oil will wind up with a lot of gas in it.

Last edited by Terry,OH; 06-07-2021 at 06:38 AM.
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Old 06-07-2021, 06:57 AM   #13
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Default Re: Fuel problem on my '40

Thx Terry !
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Old 06-07-2021, 08:18 AM   #14
19Fordy
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Default Re: Fuel problem on my '40

I have noticed that those pressure gauges (filled with glycerin) will not read accurately
due to the under the hood heat created by the engine. To solve the problem, I drained out the glycerin.
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Old 06-07-2021, 01:40 PM   #15
mike42
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Default Re: Fuel problem on my '40

Update...update.....pulled the carb for the 3rd time.....took out the power valve ....guess what....big hole blown through it. So....I have the original 1940 carb....just for the hell of it.....took it apart and installed that 81 year old power valve.....it still works, but engine runs rough, but it worked !!!! Can you imagine it still works !

Have a new valve ordered and flown in over night and that's the end of that tune.

Thx again.....Mike
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Old 06-07-2021, 01:58 PM   #16
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Default Re: Fuel problem on my '40

Were it me, sounds like a fuel pump & carburetor trip to the CharlieNY spa for a week or so long rejuvenation trip and remove that electric fuel pump and pressure regulator and install Charlie's handy work and you are golden!!!! AS Henry built it!! JMO, maybe not even $ .02 worth.
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Old 06-08-2021, 08:07 AM   #17
mike42
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Default Re: Fuel problem on my '40

Rock....understood. All comments appreciated. I've ordered a carb rebuild kit along with an extra power valve from Holley. We'll see how it all turns out.

Thx...Mike
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Old 06-08-2021, 08:12 AM   #18
19Fordy
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Default Re: Fuel problem on my '40

Mike, That's great news. Nice to see things are now getting better. Make sure power valve seats properly properly when you install it.
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Old 06-08-2021, 08:24 AM   #19
Terry,OH
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Default Re: Fuel problem on my '40

Better to use the rebuilding kit from Daytona than the Holley.
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Old 06-08-2021, 02:51 PM   #20
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Default Re: Fuel problem on my '40

As per Terry, be sure to check your crankcase for a load of gas from that leaking carb power valve.
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Old 06-08-2021, 11:31 PM   #21
mike42
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Default Re: Fuel problem on my '40

Oh crap……..pulled the dip stick and crank case has gas in it for sure. Do I just drain it and replace filter ? Anything special I need to do ? New power valve hasn’t shown up yet. So much for overnight delivery ! Other than the power valve…..is there anything else I need to replace while I got the carb apart ? Glad you guys mentioned something about gas in the oil.

Thx…..Mike
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Old 06-09-2021, 08:33 AM   #22
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Default Re: Fuel problem on my '40

I would just drain the oil and refill with new.
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Old 06-09-2021, 11:54 AM   #23
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Default Re: Fuel problem on my '40

Are you sure the fuel pump is not leaking as well? It is a more likely source of a lot of fuel in the crankcase.
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Old 06-09-2021, 01:14 PM   #24
19Fordy
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Default Re: Fuel problem on my '40

Mike, Mr. Seery makes a good point. A bad power valve would not dump gas into your crankcase. A fuel pump with a bad diafragam will allow gas to enter your crankcase.

Play it safe and rebuild the fuel pump along with your carburetor. Easy to do. Make an index mark on the top of the pump before you take it apart. BE CAREFUL NOT TO DROP ANYTHING INTO THE INTAKE WHEN YOU REMOVE AND REINSTALL THE FUEL PUMP & ROD.
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Old 06-09-2021, 05:38 PM   #25
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Default Re: Fuel problem on my '40

Seery and Ford …….I’m only running an electric Carter fuel pump. I have the other blocked off. The new power valve still hasn’t shown up !!!

Is there anything else that would cause fuel in the oil ? I bought oil and filter today and will change tomorrow.

Just for the hell of it I ordered another Holley Fuel Regulator. Could that internal pump be causing probs ? The rebuild kit has seal one made of neoprene. I also saw they have them in leather !

Thx…….Mike
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Old 06-09-2021, 05:40 PM   #26
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Default Re: Fuel problem on my '40

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PS - Gas was coming out of the base of the carb.
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Old 06-09-2021, 05:57 PM   #27
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Default Re: Fuel problem on my '40

How is you fuel line run? Does it totally by-pass the original fuel pump? Hard to see how you would get that much fuel into the oil pan from the carburetor. About the only route is past the rings and through any open valves. If there was that much fuel in the intake and cylinders I would think it would be very difficult to start or "Hydraulic" a cylinder and bend a rod.
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Old 06-10-2021, 05:04 AM   #28
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Default Re: Fuel problem on my '40

Seery …….from rear tank…..

Through a fuel filter and then to Carter Electric pump……to Holley Fuel Regulator and then to carb. I installed this set up in 2013 and have not had one problem since then until a week or so ago. Once I take the carb apart to check things out and I changed the power valve with one I had from the original carb it started and ran great so I could move from driveway to my barn. Then…all of a sudden it starts to cough and sputter and eventually stalls out. Base of carb is wet again. When it runs…..it’s like it always was…..it purrs !!
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Old 06-10-2021, 05:21 AM   #29
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Default Re: Fuel problem on my '40

Maybe the fuel reg is bad and putting through more fuel than necessary or the fuel pump is causing the problem. I ordered a new reg and have a new Airtex Electric I bought as a spare. Or…..the carb is bad in some way. I don’t think it’s a bent rod or valve because when it runs…..it runs smooth as hell !
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Old 06-11-2021, 02:25 AM   #30
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Default Re: Fuel problem on my '40

Installed new power valve and reassembled the carb. It started right up and ran perfect up and down the driveway. Fuel pressure at 2.5psi and steady. Shut it down and went to wash up and take it out for a spin. 20 minutes later will not start and gas dripping heavily from Throttle area at carb base. They overnight rebuild kit never showed up so I’m bitting the bullet and buying a new carb. I can’t keep working on this everyday like I did the brakes. Too much other work on the property.

Any recommendations on where to have mine rebuilt or buy new ?

Thx………Mike
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Old 06-11-2021, 06:38 AM   #31
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Default Re: Fuel problem on my '40

PM sent!!!
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Old 06-11-2021, 06:39 AM   #32
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Default Re: Fuel problem on my '40

Got it and thx Rock !
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Old 06-11-2021, 04:54 PM   #33
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Default Re: Fuel problem on my '40

Mike, are you still needing the rebuild? Or is it taken care of?
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Old 06-12-2021, 07:44 AM   #34
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Default Re: Fuel problem on my '40

Seery .....just got back from the barn.

I'm still waiting 6 days now for my "overnight mail" rebuild kit !!!! I did get the correct power valve....installed that and the car started right up and purred ! Drove up and down the driveway great and then went back 20 minutes later and it would not start and when it finally kicked over it ran rough as hell again. Gas started to flow at the base of the carb again. So....I ordered a new carb and it will be here Monday or Tuesday. Also a new Fuel Reg will be here today. This is so weird as it was running so well and smooth ! All suggestions are welcome !!

Thx....Mike
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Old 06-12-2021, 08:38 AM   #35
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Default Re: Fuel problem on my '40

Quote:
Originally Posted by rockfla View Post
Were it me, sounds like a fuel pump & carburetor trip to the CharlieNY spa for a week or so long rejuvenation trip and remove that electric fuel pump and pressure regulator and install Charlie's handy work and you are golden!!!! AS Henry built it!! JMO, maybe not even $ .02 worth.

Heartily concur. Another vote for a Charlie-NY restoration!
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Old 06-12-2021, 02:37 PM   #36
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Default Re: Fuel problem on my '40

Sounds like a stuck float valve, trash in that seat or a bad float valve and seat!!! A total cleaning and rebuild for sure is in order IMO!!
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Old 06-12-2021, 05:16 PM   #37
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Default Re: Fuel problem on my '40

Ant and Rock …….I thought having it rebuilt but decided to go new. I do plan on having the current one rebuilt as a backup. I’ve never had a fuel issue like this in the 9 years of ownership ! New fuel reg arrived today as well as the rebuild kit. Next Tuesday I’ll spend the day getting all the new stuff installed. The whole thing is strange as hell.

Thx for the comments.

Mike
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Old 06-12-2021, 07:05 PM   #38
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Default Re: Fuel problem on my '40

Glad to see the culprit was the power valve. If you ever need to replace the electric fuel pump, Facet, (Made by Purlolater in NY) as noted by 19Fordy, is solid state, and is self regulating. No regulator needed. There are several models, I use the one that has the lowest flow rate, at is 2-3 PSI. As 19Fordy reported, I get them from Aircraft & Spruce.
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Old 06-13-2021, 09:43 AM   #39
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Default Re: Fuel problem on my '40

Morning Guys......

So....I opened the rebuild carb kit that I got yesterday and proceeded to rebuild the old original 1940 carb I still. Replaced as much as I comfortable with. I did leave the leather plunger alone and i did not replace. I just put a small amount of oil on it ! It was dry as hell. Used all the new gaskets and a few other pieces as well as new .50 jets & needle valve that came with the kit. Used the new power valve I just bought also. Got everything back together and checked all fuel connections. All "A" Okay.....fired it up and the damn thing purred like a kitten. Let it run for about 5 minutes and turned it off. No leakage at the base and fired right up again after 20 minutes. There is only a slight hesitation when I hit the accelerator, but I'm thinking that may be the old plunger ! We'll see. An 81 year old carb too ! Geez....

The new carb will be here on Tuesday and will put that on and just save the old "40 unit since I rebuilt it and it works.

Going back out and try it again before I head out for a drive.

I just want to thank you guys again for all the comments and suggestions. Much appreciated !!

Thx.....Mike

PS - There just might be a Jack Daniels in my future after all this !! Just sayin'.....
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Old 06-13-2021, 10:58 AM   #40
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Default Re: Fuel problem on my '40

Mike, Glad your kitten is purring.

As a side note, I used the Grose Jet set up to avoid needle and seat problems and it always worked fine and dandy. Consider it as a future possibility.

https://www.google.com/search?sxsrf=...w=1226&bih=836

https://jimsgarage.wordpress.com/200...the-grose-jet/

Last edited by 19Fordy; 06-13-2021 at 11:04 AM.
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Old 06-13-2021, 11:27 AM   #41
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Default Re: Fuel problem on my '40

Sounds great so far.
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Old 06-13-2021, 12:35 PM   #42
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Default Re: Fuel problem on my '40

Well.... I have to hold off on that friend of mine Jack Daniels ! Started it up and it ran great...headed out on our side road here and after about 3 or 4 minutes it started to sputter and spit again. You could smell the heavy oder of gas ! No leakage this time, as I used new gaskets. So.....I put in the new fuel regulator and it made no difference. I had it set at 2.5 psi. I'm going to wait until new carb shows up next week and hit it again and see what happens.

You know.....I think I may meet Jack in a few minutes anyhow.

Fordy..... I'll for sure look up what you sent.

Hope you guys had a good weekend.

Thx all....Mike
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Old 06-13-2021, 12:38 PM   #43
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Default Re: Fuel problem on my '40

Fordy...that's pretty slick ! Which model or part# do you buy for the '40 Ford ?

Thx !
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Old 06-13-2021, 02:43 PM   #44
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Default Re: Fuel problem on my '40

Quote:
Originally Posted by mike42 View Post
Fordy...that's pretty slick ! Which model or part# do you buy for the '40 Ford ?

Thx !
Mike, Since I have a 1953 Ford V8 in my 40 I used the the Gross jet for the carb that was on that engine. I think it was a Holley 94. I don't know what Gross Jet would fit the stock 40 carb but, I bet the vendor could tell you and match it. I know the Holley had # 51 jets.
I would think that the vendor would need to know the manufacturer and model number of your carb to provide correct part. I bet these folks could help too. Peruse this:
https://www.google.com/search?q=how+...hrome&ie=UTF-8
Read the post in the link below by ford38v8. It tells info. about your carb.
https://www.earlyfordv8.org/forum/pr...=14&Topic=9372

Last edited by 19Fordy; 06-13-2021 at 02:57 PM.
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Old 06-13-2021, 02:51 PM   #45
mike42
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Default Re: Fuel problem on my '40

Fordy thx I’ll call and ask.

Thx……Mike
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Old 06-13-2021, 03:29 PM   #46
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Quote:
Originally Posted by mike42 View Post
Fordy thx I’ll call and ask.

Thx……Mike
Mike: I just found my 1986 receipt for my Grose Jet that I
bought for my Holley. A 3 page listing of all the Gross Jets and what carbs they fit also came with the part.

The list shows that Ford 94 v8 and 6 cyl carbs have a .084 orifice with 5/16-24 threads The Grose Jet Part Number needed is HY-32. I THINK THAT IS WHAT YOU NEED.

To be sure, post your carburetor, make and model number along with any other numbers you find on your carb and I will look thru the list for you and let you know.

Also, here's the website info. for D and G Valve Manufacturing Co., in Stoneham, MA that makes the Grose Jet item you need along with their phone number. I am sure they will know the correct Grose jet for your carb.
Give them a call to be double sure it's HY-32. I paid $4.50 plus shipping in 1986.
https://valves-and-fittings-retailer...g-co-inc/4692/
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Old 06-14-2021, 12:07 AM   #47
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Default Re: Fuel problem on my '40

Hasn't this been an issue for power valves for 94s for years. Old archives are not available. The new ones don't seat without some milling. CharlieNY question and solution. Reason I like strom 97s
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Old 06-14-2021, 02:24 AM   #48
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Default Re: Fuel problem on my '40

Fordy thx I’ll check it out and let you know.

Tinker ……I ran across another Barn member who had this very same problem. His name is Ralph S in South Carolina. Sent him a PM and hoping he responds to see if he resolved his issue. Thx for the advice.

New carb gets here tomorrow !

Mike
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Old 06-14-2021, 11:48 AM   #49
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Default Re: Fuel problem on my '40

Mike, Just for the heck of it check the seating of your new power valve by marking the surface with a black marker to see how it fits surface on surface. Blue layout dye also works the best. Also visually examine the machined edge of the valve.
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Old 06-14-2021, 12:20 PM   #50
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Default Re: Fuel problem on my '40

Fordy....this is crazy as hell ! I replaced the pump with a new one and also new needle valve and seat. Changed the power valve with a new one I got in the rebuild kit.

It fired right up.....ran perfect for 10 minutes and no probs. Came back in 20 minutes to take for a short ride. WILL NOT START UP AGAIN !! The regulator shows 2.5 psi and I drained the glycerin from the gauge also.

New carb is to be here tomorrow. I'll be working on it again, but in the meantime I'll check out the power valve as you suggested.

More drama, but it's not my brakes anymore ! They are solid !

Thx.....Mike
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Old 06-14-2021, 01:08 PM   #51
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Default Re: Fuel problem on my '40

Did you check for spark when it would not start?
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Old 06-14-2021, 03:05 PM   #52
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Default Re: Fuel problem on my '40

Flat...yes it has spark. It fires but, I'm getting a heavy gas smell. It's strange....after I've taken the carb apart and it's dried out and I'm changing jets and pump and power valves, etc.....it starts right up and runs sweet ! After I turn it off and go back to take a ride.....it will not start except like it's flooded !

Years ago....I had Skip Haney redo 2 coils.....after I get the new carb tomorrow or Wednesday....if I still have the same prob I'm going to change the coil for the spare I had rebuilt. When I had coil probs about 8 years ago....the car would start and run great but after about a half hour when things heated up.....the coil would die and i had to wait for it to cool down. This won't restart after 20 minutes. If I was to take out the carb and drain it.....re-install....it would start right up and run great !

Very strange !

Thx.....Mike
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Old 06-14-2021, 04:15 PM   #53
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Default Re: Fuel problem on my '40

What's chances of a cracked or porous carb body casting? After a fresh assembly, everything is dry and proper and it runs fine; let it sit a while and the fuel seeps through somewhere and causes your problem. May also be a warped casting.

I'm grasping at straws here, but nothing else seemed to work. Next time you have t apart, closely inspect all of the components.
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Old 06-14-2021, 05:35 PM   #54
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Default Re: Fuel problem on my '40

Tub…….the new carb should be here tomorrow or Wednesday. That’ll be when I take it apart again. Thx for the tip and will check that out..

Mike
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Old 06-15-2021, 12:09 PM   #55
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Default Re: Fuel problem on my '40

Took out the carb and removed the power valve. It was a Holley and the rounded corner were possibly preventing a good seat. The gasket they sent me was regular gasket material and not neoprene. In fact there was 2 gaskets stuck together ! So I took the other power valve and that radius is not there so I installed that and reassembled everything. Fired right up and ran perfect for 20 minutes or so. Went into town for an hour and came back and started it up and it barely started and heavy rich fuel smell and very rough !

New carb comes today or tomorrow and we'll see what happens.

As the stomach turns......!

Thx.....Mike
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Old 06-15-2021, 01:10 PM   #56
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Default Re: Fuel problem on my '40

The more I hear about this, the less I think I was grasping at straws. A new carb should fix it.
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Old 06-15-2021, 02:47 PM   #57
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Default Re: Fuel problem on my '40

Mike, don't forget new parts do not necessarily mean good parts. I would make sure you change your oil everytime you smell the gas, if it's in your oil thats really bad and you will be doing bearings in your motor.

I think your fuel pump is staying on and your needle and seat is leaking, filling your motor with gas.

Can you remove the top of your float bowl and then turn on your fuel pump or do you have a sight plug in the bowl? Then you can check to make sure the needle and seat are working properly.
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Old 06-15-2021, 03:36 PM   #58
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Default Re: Fuel problem on my '40

Supertuner700
You took the thoughts right out of my brain.....was gonna ask IF he was sure his fuel pump was shutting down BUT he never complained about a low or run down battery!!!!




ALSO Mike42.....after the 20 mins sit time, before you start or attempt to start the car have you pulled a plug or three to see IF they are wet with fuel????
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Old 06-15-2021, 05:18 PM   #59
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Default Re: Fuel problem on my '40

Tub…..Super and Rock…….I’m hoping the new carb does do the trick. I’ve only driven the car one week since last early October ! Geez

I have a Carter electric pump and it seems to go off when I turn off the switch. Is it possible that it still pumps a bit after turn off ? I also have a Holley fuel reg set at 2.5 psi. No regular fuel pump. I have that blocked off. Never a run down battery. Always a strong start and runs great upon initial start up. After sitting is when the problem occurs. When it runs it runs really great and smooth. I have another new Airtex electric and will install that if the new carb doesn’t show results.

When I can get it started it’s like the choke is closed and exhaust pipe smokes like hell of gassy fumes and I shut it off right away.

Rock…..never pulled any plugs right after I stop it, but have checked a plug or two when cooled down and they are pitch black !

I’ll report back after the new carb is installed tomorrow.

Thx…..Mike
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Old 06-15-2021, 05:57 PM   #60
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Default Re: Fuel problem on my '40

Do you guys think the electric fuel pump is faulty ? I mean…….that’s the only thing left that haven’t changed !
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Old 06-15-2021, 11:29 PM   #61
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Default Re: Fuel problem on my '40

Quote:
Originally Posted by mike42 View Post
Do you guys think the electric fuel pump is faulty ? I meanÖÖ.thatís the only thing left that havenít changed !
Very well could be, thatís why I would check to see if your float is working.
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Old 06-16-2021, 01:53 AM   #62
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Default Re: Fuel problem on my '40

New carb is being delivered today and we’ll find out if that’s the fix. If not….the pump is the last item to change and I’ve got a new one ready to go. More later !

Thx
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Old 06-16-2021, 06:35 AM   #63
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Default Re: Fuel problem on my '40

Mike
My question was "AFTER" it sits for the magic "20 minute" period, NOT right after you start it and it runs fine and you shut it off. IF your plugs are both sooted over AND "WET WITH FUEL" after 20 minutes of sitting "AFTER" it ran good, I'd be looking to see "WHY" they are all wet when it hasn't been running for 20 minutes!!!! Just to clarify
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Old 06-16-2021, 06:42 AM   #64
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Default Re: Fuel problem on my '40

Gotcha Rock……..I’ll have the carb this afternoon..UPS sez it’s out for delivery.
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Old 06-16-2021, 07:14 AM   #65
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Default Re: Fuel problem on my '40

Hope it works for you!!!! Fingers crossed!!!


Mike, just another thought....my frame of reference (so to speak) comes from our 32 and the Detroit Lubricator carb we had on it. It would perform and run the car beautifully BUT every time after and car sat for a week or three, the float was stuck and when you would go and start the car.....I would have to open the hood and stand and watch it because fuel would start pouring out of the carb. You could take a wrench or handle of a screwdriver and tap on the top of the bowl cover and that would free the float back up and everything worked as it should!!!! BUT that "stuck" float was the issue!!! OR before we would start the car we would tap the cover of the bowl to avert the above scenario.

Last edited by rockfla; 06-16-2021 at 07:26 AM.
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Old 06-17-2021, 03:27 AM   #66
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Default Re: Fuel problem on my '40

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Rock……..new carb showed up from UPS late last night so I’ll be installing around 5am this morning. Will advise once I fire it up. I tried tapping on the float area also but no luck. I’ve also got the new Airtex Electric Pump ready to install in case I still have probs. There’s not much else to change !!

Thx……Mike
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Old 06-17-2021, 05:50 AM   #67
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Default Re: Fuel problem on my '40

et al.....Installed the new Dennis Carpenter Carb early this morning.....and other than forgetting to hook up the fuel line from the fuel regulator ...which won't get into....she fired right up and ran perfect for 15 minutes at 500 rpm. Just went back after hour and a half and hit the button and fired right up and purred like a kitten again. NO smell of fuel at all ! Took it for a short ride and put back in the barn and will try again in an hour or so, but the drama appears over. The Reg shows 2.8 psi and I'm going to take that to 2.5 psi today. It's amazing what $ 500 bucks will do huh ? But hey....I want to drive my car and at this point I could care less.

Just want to thank all for comments and suggestions during this ordeal. Much appreciated.

Thx...Mike
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Old 06-17-2021, 08:19 AM   #68
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Default Re: Fuel problem on my '40

Great news. It had to be float related, you can keep testing on a bench for your own knowledge on the old carb.
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Old 06-17-2021, 08:37 AM   #69
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Default Re: Fuel problem on my '40

I'm still betting it was a cracked, porous, or ill-fitting carb body. When and if you get enough time, it might be instructive to disassemble your old carb and give it a thorough inspection and see what you find.
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Old 06-17-2021, 09:37 AM   #70
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Default Re: Fuel problem on my '40

It would be interesting to find out how much fuel pressure it really takes to "overpower" a needle and seat on your carb. I ask this because if your fuel pump has a max output of 3 psi, why would you need a regulator at all?

I know that on my Holley 4 barrel it's about 7 psi. The fewer components you have in your fuel line eliminates potential component failure and aggravation.
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Old 06-17-2021, 09:39 AM   #71
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Default Re: Fuel problem on my '40

Rock....plugs are getting clean, but there was no wetness when I pulled a couple plugs before the new carb.

Super and Tub.....I plan on keeping the old carb and doing as suggested to check it all out. I did hold the float under water once to check for bubbles and there was none.

Just got back from a 10 mile run. It stumbled a bit 3 or 4 times going up some hills, but other than that it was smooth as glass !

Thx.....Mike
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Old 06-17-2021, 09:42 AM   #72
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Default Re: Fuel problem on my '40

Fordy..... I put on the reg from a suggestion here on the Barn. For 9 years I had NO probs until 3 weeks ago ! I've it set for 2.5 psi right now and seems to run fine. I was told 4 psi may be too much, so that's why I reduced it.

Right now my car is drivable and I plan on enjoying it !

Thx....Mike
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Old 06-17-2021, 09:44 AM   #73
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Default Re: Fuel problem on my '40

Good news!!! Go enjoy!!!
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Old 06-17-2021, 09:53 AM   #74
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Default Re: Fuel problem on my '40

Mike: When you get time it's interesting to read about and visually see how fuel pressure affects flow based on demand.
https://www.offshoreonly.com/forums/...me-vs-psi.html

Peruse these links.
https://www.google.com/search?q=how+...hrome&ie=UTF-8

https://www.youtube.com/watch?v=nAe_5YwWoV0

Also, since you now have your old carb to play with, go thru it piece by piece so as to fully check it out and practice rebuilding it yourself. I bet you will be successful unless the casting is porous as has been mentioned earlier.

Last edited by 19Fordy; 06-17-2021 at 10:19 AM.
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Old 06-17-2021, 11:18 AM   #75
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Default Re: Fuel problem on my '40

Fordy …….. I plan on doing that check all the pieces to see if I can spot anything. I’ll follow up at another time.

Rock ……pulled two more plugs on the left bank and running much cleaner ! Thx for the tip.

I just took a run around our lake which is 18 miles. Perfect and didn’t stumble at all this time.

When I got home I pulled the plugs and was wiping everything down and checking for leaks. None at all, but I did find that the larger upside down screw that holds the float bowl to the carb base was never tightened !! Was able to use my angle screwdriver and tighten that little bugger up !!

Have a good weekend guys. I am…….!

Thx……Mike
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Old 06-17-2021, 01:23 PM   #76
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Default Re: Fuel problem on my '40

Congratulations ! ! !
Paul in CT
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Old 06-17-2021, 02:46 PM   #77
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Default Re: Fuel problem on my '40

I think finding that leaking screw will void the porous casting possibility.

Now, patiently rebuild your old carb like the pros do.
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Old 06-17-2021, 03:14 PM   #78
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Quote:
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I think finding that leaking screw will void the porous casting possibility.

Now, patiently rebuild your old carb like the pros do.
The way I read his post is that the loose screw was on the new carb, not the "leaker". Why else would he have to use his "angle screwdriver" to tighten it?
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Old 06-17-2021, 05:18 PM   #79
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Default Re: Fuel problem on my '40

Tub ……yes on the new carb and not on the old one.

Took another run around the lake and all is well. It’s great having my car back. Washed and polished it today. Smoked a cigar and had a couple Jack Daniels. Life is gooooood ! LOL

Mike
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