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Old 11-30-2011, 05:44 PM
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Low fuel pressure

Well I just put a new pump on my 95 and she runs great just as when I had the leaky pump on there, and just like when I had the bad pump my pressure gauge is all over the place bouncing at all times between 20 and 60 psi, when I first put on the pump it was at a fairly steady 40 psi at idle. This new pump is not leaking as I can see but this is the 3rd pump since Saturday and the other 2 were leaking from the weep hole within a few hours, could this pump be leaking also but on the push rod and diesel going into the motor? I need help with this as I love this truck and the body style, and never want another truck again. Thanks in advance all.
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Old 11-30-2011, 06:09 PM
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Have you inspected the Fuel Pressure Regulator spring and plunger to make sure there are no issues (such as kinked spring, scored bore/spool)? Also, check the orifice screen between the FPR block and filter bowl joint to make sure it is not clogged. Is your pressure gauge a liquid-filled type (liquid-filled dampen, but not totally get rid of the pulses due to the mechanical nature of the pump being run off the cam)? Cheers!
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Old 11-30-2011, 06:25 PM
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I had rebuilt my fuel bowl about 2 months ago due to fuel leaks, the spring and bore looked great, I also cleaned both the screen and the small filter on the side of the bowl, and no it's just a cheap fuel pressure gauge that I have for testing, I understand about the liquid filled gauge but when was it much smoother right after the pump I stall? Could it be because their was still some air in the system? I'm baffled on what to do.
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