fuel pump symptoms
Post Fiend
Joined: Dec 2009
Posts: 15,505
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From: Livoina,La
if you have a leak at the weep hole then the pump is going bad. not to sure about other problems but i would say if it's leaking then it's putting out it's full recommended pressure and my not be able to keep up with your eng. fuel demand
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Junior User
Joined: Apr 2003
Posts: 72
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it's not leaking. Here's my situation, my truck has a Frybrid WVO kit installed. Part of this installation involves tweaking the fuel flow, now the diesel is sucked through the filter instead of pushed,(this eliminates the WVO going into the stock filter) so the schrader valve had to be capped off. . So I bought a cheapy Harbor Freight fuel injection test kit and I've hooked up the pressure gauge with a "T" fitting between the output of the low pressure side of the pump and the high pressure side. I can start up and it seams to idle ok, but still has power issues when test driving, the HF test gauge reads under 10 PSI. I know the pressure when measured at the schrader valve would normally be 45-75 psi. Is the pressure at the schrader valve made by the low pressure side of the fuel pump? I don't know if the HF gauge is a POS, could I really only have <10 PSI and the problem be my fuel pump?
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Junior User
Joined: Apr 2003
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it feels like a fuel deprivation problem. At low rpm it feels okay, but as you increase load it starts to feel like a shudder, almost like when there is air in the line. When I first noticed the problem a few weeks ago, it only happened while running on diesel and when my tank was below 1/4 full, I thought perhaps it sucked some air. When it did first happen, it would stop doing it by the time I switched over to WVO. Then last weekend, it started to have power loss while on WVO. i pulled over, purged the WVO and was back on diesel which made it even worse, i did not even have enough power to climb a very slight grade. I switched back to WVO which was a bit better and managed to limp my way home. Right now I have the WVO system totally bypassed, I can't run that until the engine is up to temp anyway. Both diesel and WVO filters are new, they do share the same stock pump and only about 12 inches of common fuel line to the pump.
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