Technical Fuel pump weep hole question.

On my 55 Plymouth, with the 241 Poly motor I've had an oil leak coming from the fuel pump and finally pulled it off To find that there is a weap hole that oil is getting out of. This Hole goes directly into Nothing but atmosphere as there is not a seal or anything. I imagine when I'm getting on and off The throttle the pressure in the crank case is pushing oil out of this. I do have the engine vented correctly. I should be able to just put some epoxy In this And it should be fine, correct?

 

Not if you want the pump to work. That hole provides a vent on the back side of the diaphragm. Otherwise the diaphragm will not work. Oil should not be in that cavity.

 

How much oil? Is it a steady drip or you are finding residue?

 

Well, oil is getting flung around off of the timing chain right there, so oil does get in the pump. Just pulled the bottom off of the new pump to check it out and sure enough it does what you say as a vent. Perhaps the old pump has a hole in the diaphragm. I'm gonna pull it apart now. You can see the paper clip tip in the photo that I stuck through the hole.

 

So I pulled the Old pump apart and there is a lot of oil inside of it. Perhaps I need to check my engine venting? .

 

Being that that hole does eventually vent into the crank case by way around the pivot. I imagine I could plug it. As it will still vent, but through the crank case.

 

The hole is actually there to let you know when the diaphragm let’s go. Look up marine fuel pumps. They press a small barb fitting in that area so a hose can be run to the air filter. In turn the engine either runs super fat or dies causing one to investigate what went wrong rather than a possible fire from raw fuel not being detected.

 

What about tightening up the opening around the arm with the gasket to act as a splash guard.

Even my girls Studebaker didn't leak from the vent hole, but it sure leaked past the pivot pin on both sides.

 

Well, I plugged the new one with a piece of rubber and tested it in a vise and it doesn't seem to pump as good, so perhaps there is a seal on the arm and on the old one that is letting the oil come through. I was.
Thinking about making the gasket bigger also.

 

There is an oil seal around the rod that connects the diaphragm to the lever. Looks like it’s failed or popped out.

 

Thanks oneball. Gonna swap on this new pump in a little while today. And as far as the oil leaking out of it, I believe it was just barely coming out. But the air from the fan blew it all over the side of the engine and frame

 

Small round black bit between the two valves.

 

Where’s @fuel pump when you need him?

 

But then, if that diaphragm ever ruptures, it’s going to fill the crank case full of gasoline.

 

You are correct, Kevin. I'm just going to install the new one and see what happens.

 

I've had pumps leak oil. Changed for a new pump, no oil leak. The fact that it's leaking oil is telling you that the pump needs to be replaced as it has experienced an internal seal failure.

 

Put the new pump on and went to rescue my girlfriend in her daily.her fuel pump went out.got her car back to my shop and piled in the Plymouth and made it a1000 feet .no fuel getting to the carb.turn on electric pump and still nothing. Pushed it back to the shop. No fuel getting to the engine. Got a ride home.now I gotta fix 2 fuel problems today

 

PCV system helps if you don’t already have one!

 

I do have a PCV system set up. So this morning, I took the fuel line that goes into the mechanical fuel pump off and turn on the electric pump and gas is coming out. No problem. So then I just hooked it straight to the fuel line after the mechanical pump and it runs fine. I tried to blow through the mechanical pump and nothing. This brand new pump is junk already. And I think I'll just end up using the electric pump from now on. As this is my third or fourth mechanical fuel pump in 8 months.lame

 

The rubber in some fuel pumps don't like ethanol. Oil and filter change might be an idea. The ruptured pump diaphragm sometimes allows gas inside the engine.

 

No gas in the oil. It almost seems like the arm isn't correct on the fuel pump itself as I can cycle it in a vise. But when it's on the motor it really doesn't do much.

 

Daft question; you have got the new pump hooked up right? What happens if try to blow through the pump the wrong way?

 

Dang, that’s some bad luck on fuel pumps.

 

+1

 

I was going to make a comment about fuel pumps but didn't want to muddy the waters. Since you're having trouble with new pumps I can comment. I've had trouble the last few years with mechanical pumps (dying early, leaking or over pressurizing), I've resorted to finding old made in USA rebuildable Carter pumps and buy a quality rebuild kit for it. I even went so far as to buy an old 80s Carter catalog. I have an old Carter performance fuel pump from the late 80's (I bought new), that's been on at least 4 cars over the years and still works great. I'm stocking up on other pumps now.

Studebakers have that problem with new Carter pumps, the arm isn't in the correct spot to get a full stroke from the eccentric.

 

It seems like it's not getting a full stroke.

 

Bad news, he's not around anymore.

 

Found on a review on a Studebaker pump from Amazon. The "R" is the stock pump and the "C" is the new "made in China" Carter.

 

Sounds like I need to find an nos one.just drove home on the electric pump after I bypassed the stock pump

 

where do you get a quality rebuild kit for these pumps?