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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
mike42
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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
Ken hash
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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
JSeery
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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
mike42
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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
mike42
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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
mike42
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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
rockfla
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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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