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fuel leak out the pig tail

T

terry274

Member
Hi, I have a 1964 Super Dexta with the Simms mechanical governor fuel pump. When I pump the lift pump lever, fuel comes out of the pig tail vent tube. I did some research and it seemed like a ruptured diaphragm in the lift pump could be the issue.

However, after I removed the lift pump I could pump the lever and build pressure by blocking the outlet with my finger. The pressure holds, doesn't leak down. This makes me believe the lift pump is not the problem.

Where should I look now?
 
(quoted from post at 16:30:45 09/03/21) Holding pressure may not be the problem, you need to block the
intake with your finger and see how long it holds suction.
Click to expand...

Thanks Majorman. I will check that today. I received some advice on the Fordson site also, so I have a direction now!

Terry
 
I filled the lift pump with fluid and worked the lever. The pump holds vacuum at the inlet and pressure at the outlet. I also removed the five screws and examined the diaphragm. I saw no ruptures and under the diaphragm was dry.
I put the lift pump back on the injection pump and pumped up pressure. No drips of visible leaks.
I removed the deliver cover from the injection pump and again, no visible leak.
Started the tractor with the cover off. At first, everything looked dry. Then with the tractor running I saw small bubbles near the base of the plungers.
I suppose this means there is wear in the plungers.
The tractor still runs very well. Should I just leave it and allow it to get worse? Or is there some preventive maintenance that I should do at this point?
I did change the oil in the pump. It came out mostly diesel and had a shimmery brass look.


This post was edited by terry274 on 09/04/2021 at 08:16 am.
 
There is supposed to be leakage at the plungers and the bottom part
of the pump is supposed to have a certain amount of diesel in it to
lubricate the camshaft and plungers. Oil in the pump only
lubricates the mechanical governors not the whole pump. The pigtail
pipe is designed to hold that certain amount of diesel in the cam
box and to allow excess to drain off to the ground.

I think your pump is fine, do not worry.
 
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