|
Sponsored Links (Register now to hide all advertisements) |
|
|
Thread Tools | Display Modes |
|
02-07-2011, 02:09 AM | #1 |
Member
Join Date: May 2010
Location: So Cal
Posts: 84
|
Fuel pump oddity
When mounting the fuel pump to my 8CM, the rod seems to be about 1/2" too long because when the cam is as full rise, the pump sits about 1/4'1/2" off the intake manifold. The rod is seated in the receptacle of the pump. Is there something I'm missing here?
I got the engine disassembled but this is definitely the rod and pump that were on it before. The photo does not show the pump raised up but maybe there's something else obvious? |
02-07-2011, 05:31 AM | #2 |
Senior Member
Join Date: May 2010
Location: Tyler Texas
Posts: 226
|
Re: Fuel pump oddity
Hello Steve Is that with or without a gasket. One or two. It does seem odd that there is that much space. My dad use to use the gaskets (adding more for less fuel pressure) removing them for more pressure. Some of the old carburetors were pressure sensitive.I do not have a fuel pump rod pulled on my 53 8CM so I cannot give you a measurement. Lyle
|
Sponsored Links (Register now to hide all advertisements) |
|
02-07-2011, 05:33 AM | #3 |
Senior Member
Join Date: May 2010
Location: Tyler Texas
Posts: 226
|
Re: Fuel pump oddity
PS the A is my wife's car it is a 29 model the Wife is a 53 model
|
02-07-2011, 07:17 AM | #4 |
Senior Member
Join Date: May 2010
Location: Holland Mi
Posts: 643
|
Re: Fuel pump oddity
You say that the engine is dissassembled? Is the camshaft positioned properly?
|
02-07-2011, 07:51 AM | #5 |
Senior Member
Join Date: May 2010
Location: East Hartford, Ct
Posts: 5,898
|
Re: Fuel pump oddity
The correct pushrod is 10-1/16 inches long. When the lever cup is positioned on the rod you have to push the pump down into position to bolt it. (this is to overcome the the spring preload) Doesn't sound odd to me.
|
02-07-2011, 08:24 AM | #6 |
BANNED
Join Date: May 2010
Posts: 3,019
|
Re: Fuel pump oddity
Sponsored Links (Register now to hide all advertisements)
Do not be surprised if when you remove the FP the cup that traps the push rod is smaller than the pushrod. The small cup accomodates the '48 back push rod which is smaller in dia than the 8ba. The other thought is...are you just feeling the resistance of the spring and diaphram? I like to get the push rod at full height then install the pump and stand pushing it down with the heel of my hand until the stand smacks solid on the intake....with a fresh pump there is some resistance before the smack. Charlie ny |
02-07-2011, 08:43 AM | #7 | |
Senior Member
Join Date: May 2010
Location: North Dakota
Posts: 1,623
|
Re: Fuel pump oddity
Quote:
__________________
I dig coal, which provides motivation for EVs. |
|
02-07-2011, 09:58 AM | #8 |
Member
Join Date: May 2010
Location: Granbury, Texas
Posts: 66
|
Re: Fuel pump oddity
There is also a rod length difference between the aluminum and cast iron intake manifolds. I believe it is a full inch though if memory serves me. Joe
__________________
Joe. |
02-07-2011, 11:02 AM | #9 |
BANNED
Join Date: May 2010
Location: stratford,ct
Posts: 5,971
|
Re: Fuel pump oddity
Joe that only applys to 48 and older engines.Some one could have mistakenly installed the wrong cup arm on the pump as Charlie said. 49 up has a fatter rod and only 1 length 10+" ken ct.
|
02-07-2011, 02:16 PM | #10 |
Member
Join Date: May 2010
Location: Granbury, Texas
Posts: 66
|
Re: Fuel pump oddity
Ken, Thanks for the correction. Keep forgetting about those NEW flatmotors. By the way, that carb is working great on our 59AB that I put in the 40. Thanks again. Joe
__________________
Joe. |
02-07-2011, 01:10 PM | #11 |
Member
Join Date: May 2010
Location: So Cal
Posts: 84
|
Re: Fuel pump oddity
Thanks guys, first please note that in the photo above the pump is sitting flush because the camshaft lobe is down. When up, the fuel pump comes WAY up, probably 1/2". I just didn't take a photo of that when i had a chance.
- The engine is back together and nearly ready to run, so the camshaft is in position. - The rod is a shade over 10" long. - The fuel pump has not been rebuilt yet. Also, I did make sure the rod would fit into the cup in the fuel pump, and the spring is not terribly strong so no problems overcoming it. |
02-08-2011, 06:24 PM | #12 |
Junior Member
Join Date: May 2010
Posts: 7
|
Re: Fuel pump oddity
Steve,
I am having the same problem with my 1950 8CM and an after market 2x2 intake. My pump with stand won't sit flat even with the push rod in it's lowest position. The rod is fitting well into the FP cup. I don't know what the problem is. I hope we can find out here. |
02-08-2011, 08:53 PM | #13 | |
Senior Member
Join Date: May 2010
Location: East Hartford, Ct
Posts: 5,898
|
Re: Fuel pump oddity
Quote:
|
|
02-09-2011, 09:19 AM | #14 |
Junior Member
Join Date: May 2010
Posts: 7
|
Re: Fuel pump oddity
51-MERC-CT,
It is an Offenhauser for the latter block. The engine was rebuilt before I bought it. The push rod is new, pump and stand are old. Are the 8CM and 8BA pumps interchangeable? DK |
02-09-2011, 12:52 PM | #15 | |
Senior Member
Join Date: May 2010
Location: East Hartford, Ct
Posts: 5,898
|
Re: Fuel pump oddity
Quote:
The 8BA pump will work in place of the 8CM double pumper. ( that's what I use) Something to try- Turn the engine to #6 cylinder TDC. Lining up the rotor to the cap is close enough (this puts the fuel pump pushrod at it's lowest point making it easier to install the pump) |
|
02-09-2011, 06:19 PM | #16 |
Junior Member
Join Date: May 2010
Posts: 7
|
Re: Fuel pump oddity
51-MERC-CT,
Thanks for the great info. and taking the time to demo. with pictures. I was able to mount the fuel pump with your directions. It helped to mount the base first and then attach the pump as in your photos. This is my first flathead experience. Thanks for taking the time. DK |
02-10-2011, 10:38 PM | #17 | |
Senior Member
Join Date: May 2010
Location: MN
Posts: 7,063
|
Re: Fuel pump oddity
Quote:
I doesn't look flush either in your picture. Is it warped? Oops I see it's a stock intake. Well then is it going through the bushing to the cam? Does it move up and down? ********"Offy intakes take a longer fuel pump rod. " Oooops again, yes 51 Merc-Ct you are correct. Shorter rod on a 59ab*************** Last edited by Tinker; 02-13-2011 at 09:14 AM. Reason: error, my bad |
|
02-11-2011, 07:26 AM | #18 |
Senior Member
Join Date: May 2010
Location: East Hartford, Ct
Posts: 5,898
|
Re: Fuel pump oddity
I am currently running an Offy intake and it does not take a longer fuel pump rod. It uses the stock 8BA pushrod. The only time the pushrod would be a different length is if you were using an earlier 59AB fuel pump/oil filler/breather setup. Then the pushrod would be shorter.
|
02-09-2011, 12:20 AM | #19 |
Member
Join Date: May 2010
Location: So Cal
Posts: 84
|
Re: Fuel pump oddity
My intake is labeled 8CM, same as the block, so I know that isn't my problem. But darned if I know what IS my problem! I'm not comfortable just cutting down the rod to fit. It came with this engine so it should work!
|
02-09-2011, 06:44 AM | #20 | |
Senior Member
Join Date: May 2010
Location: East Hartford, Ct
Posts: 5,898
|
Re: Fuel pump oddity
Quote:
You don't have a problem if all the parts are the same as you removed them. |
|
|
|
Sponsored Links (Register now to hide all advertisements) |
|