Engine/Transmission (1994 - 1998) 95 fuel pump eccentric

[CMadere]

Im working on a 95 with a fuel delivery issue. It has a 2 month old, factory lift pump. Came in running poorly to not at all. That turned into a no start. Fuel pressure is 0 . I tryed another pump, 0. Tryed hooking up my own fuel can. nothing. vacuum on the suction side is a flickering 1"hg. i think cam eccentric may be wore out but do not have specification. maybe I should just skip it and by electric. I dont know.

 

[Joe G.]

It's probably the fuel heater. The original pump is probably good.

 

[CMadere]

despite the fact the lift pump is only 2 months old. replacing it with another one fixed the problem. And for future reference cam lift was . 325.

 

[RMidgett]

Hi,
I'm having lift pump issues in my '96. When I connect my Mighty Vac to the input side of the lift pump, I can pull quite a vacuum on it, better than 15 in Hg. Operating the manual priming pump on the lift pump gets no vacuum. I run biodiesel, and replaced the lift pump 8 years ago after I buggered the check valves by mistake. (another story)
Wondering if you know what the proper vacuum pulled by the lift pump intake is supposed to be; that'd be helpful troubleshooting info for the future.
Thanks,
Robin

 

[LandShark]

I was trouble shooting a similar problem today. New fuel return line, overflow valve, lift pump and running fuel direct to the pump (totally bypassed the heater and screen) did not help. I cut into the fuel supply line at the frame rail (under driver footwell) and hooked up a small electric diesel fuel pump. The supply line did not leak any fuel when I cut into it (normal ??), but the output from the pump was frothy. I would guess about half air and half diesel. Tomorrow I will start checking the fuel supply line back to the tank and determine if I need to get into the tank. No obvious leaks.

Maybe I can figure out how to pressurize the line to help find the leak.

I don't expect much gunk in the tank as the prefilter screen was clean.