AC fuel pump leaking from weep hole

[mngreen]

Hello:

My AC fuel pump is leaking from the weep hole below the diaphram. I bought a new diaphram, honed both mating surfaces for a good seal, put it back together and it STILL leaks from the weep hole. I know that it is generally said not to put any sealer in the pump. Perhap I can put a little flexible permatex between the two disks holding the diaphram center?

What say you all? Help, please! I don't want to have to drain that @#!$ tank again!!!

[columbiA]

If you have to put sealer between the 2 discs on the diaphram,then you have a defective one.When you assemble the pump ,always push the pump lever to pull the diaphram down before you tighten the screws.Since when do you have to drain the tank when the pump is higher than the tank?

[Mart]

What sort of car and engine are we talking about here? Is it a model A with the cowl tank?

Mart.

[ken ct]

Model "A"'s do not have FP's. ken ct.

[mngreen]

I have a Model A with a B block that has an AC fuel pump; sorry, I should have been more descriptive! My fuel shut off below the tank does not seal completely hence my having to drain the tank.

I just bought the diaphram from Snyders in OH; the part supposedly was a Ford licensed one. Comparing it to the one removed from the pump, it is thin solid rubber compared to the woven rubberized material of the old one.

[mngreen]

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What about putting two diaphrams in together? No good? I also scoured all of the previous posts on this forum board. I did push the pump lever while tightening the screws.

Any other help?

[Charlie ny]

mn,
May suggest using the reb kit from John Plaskan....813 713 5820. Not
cheap be forewarned. I just did a bunch of 'B' pumps using Johns kits....no problems.
If you don't have a disc sander try a piece of 60 grit sand paper stretched over
something flat to be absolutely sure both halves are true. Place them together and
hold them up to a light...no light should thru.
Charlie ny

[mngreen]

Charlie, I did sand both halves of the mating surfaces with 220 grit silicon carbide paper on a flat stone bench so they are true.

[mngreen]

Here is a scan of the new diaphram packaging, if anyone knows if these are good.

[Charlie ny]

mn,
Plaskan. The logo is good looking but....well....I dunno.
Charlie ny

[rotorwrench]

The company that packages parts may pay FoMoCo to put their logo on there but whether FoMoCo checks them for quality or not is in question. Modern fuels will deteriorate some diaphragm materials very quickly. Charlie ny has the right idea. If you know a good supplier that stands by their product with no warranty issues, go to them no matter how much it costs, especially if it has a head pressure on it continuously.

Kerby

[columbiA]

In 55,I needed a F-P for a B engine.I used a pump from a 37 & up FH Plymouth,Dodge etc & all I had to do was heat & bend the pump arm & with a little trial & error,I got it to work just fine.

[ken ct]

Mike,send me the pump,i'll do it up for postage and parts chg.only.We have been going around in circles with your problem for tooo long.Give me a shot at it.Wont be much. ken ct.

[JWL]

The fuel leaks which show at the weep holes are not the fault of defects in the flat, smooth mating faces on the castings. The weep hole leak occurs when fuel is transfered from the upper, fuel, chamber to the lower mechanical chamber of the pump. This fuel transfer can happen when the diaphram has a defect or the seal at the metal pancake which has the mechanical stem connection is incomplete. While it is important to have flat surfaces it is unnecessarily confusing to bring this into a question about weep hole leaks.

[richard crow]

ken ct offered you a good deal he will fix it right

[BILL WZOREK]

I wish I had a weeping pump I would take Ken up on that offer $$
Take him up on it before He reads his own Post. LOL

BILL W

[G.M.]

The diaphram is leaking in the material, around a screw or in the center where yhe pull rod go's through. You need to check the oil and make sure there is not gas in the oil. You also need to fix or get a new fuel tank shut off valve so you can turn the gas off when hot in use.. G.M.

[Mart]

Is it fuel that's leaking, or oil?

I had a motor with bad blowby and it used to leak oil through the fuel pump vent hole.

Just make sure you are trying to fix the right thing.

Mart.

[mngreen]

Thanks for all the replies and the kind offer by Ken Ct.

Like JWL says above, I believe that I had an incomplete seal between the pancake disks on the mechanical stem connection. I put a little permatex #2 in that area and dogged the nut down tight in a vise and all seems well. No leaking yet. Weather permitting I will tour around a bit more this weekend!

[Jim in Wisconsin]

It seems like it would be better to use a Model A fuel line from the shutoff to the carb and blank off the fuel pump hole in the casting. Or do you have a different carb setup?