Fuel pump leak test question

[Norris W.]

One of my cars appears to be making oil. It's way over full on the dipstick and I don't believe I over filled it. It's basically been cranked to move on and off trailer and in and out of show area and has probably only 25 or so miles since engine rebuild with new AC pump. The oil appears very clean and I don't see any signs of water, but I don't smell fuel either although that's what I suspect. Is there a simple way to test it for diaphram leak before I thin the oil and wipe out a lobe or worse?

[Joe L.]

Re: Fuel pump leak test question

One of my cars appears to be making oil. It's way over full on the dipstick and I don't believe I over filled it. It's basically been cranked to move on and off trailer and in and out of show area and has probably only 25 or so miles since engine rebuild with new AC pump. The oil appears very clean and I don't see any signs of water, but I don't smell fuel either although that's what I suspect. Is there a simple way to test it for diaphram leak before I thin the oil and wipe out a lobe or worse?

Norris-----


I don't know of any way to test the fuel pump diaphragm for the sort of leak that might result in oil contamination. However, if I were you I'd drain the oil. If there is significant gasoline in the oil, you'll be able to discern it by odor.

[Norris W.]

Re: Fuel pump leak test question

Thanks for the reply Joe. I was wondering if I plumbed a pressure guage to the output side of the pump and cranked the starter over if I would expect it to hold pressure or would it normally drop out instantly. (non return line fuel pump of course)