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10-12-2007, 09:37 AM
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Hey all...just had a quick question. This morning my brothers truck...blackbanshee.....would not start. The motor would trun over heartily...but no fuel. I primed the fuel filter and she fired off immediately. He has quite a few fueling mods and a recent headgasket replacement. Never had this problem before...usually cranks twice as fast as my truck. Was there just air in the line? Lift pump going out? Does it have anything to do with the headwork? thanks for the input. redwake
10-12-2007, 11:23 PM
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It sounds to me like there might have been some air in the line. I can't say if the lift pump is going bad or not because I haven't had any bad experiences with one. My truck was starting hard and I have my pump as far as I can take it. I went to pick up some funiture at one of my wifes cleaning clients house (with a freshly seal coated driveway) and noticed a puddle under my fuel tank. Lucky me I found out that I have a pin hole in my fuel line from the tank to the pump. Check the fuel lines to make sure that they are dry and all of the connections are tight. It ain't fun pulling out the fuel tank. Hopefully for you it's just a fluke.
Good luck Ryan
Good luck Ryan
10-13-2007, 01:06 AM
#3
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A diaphragm lift-pump going bad will allow fuel to drain back toward the tank, usually after the truck has sat for several hours.
It may still pump good pressure, when running, but will not hold the fuel in the lines.
It may still pump good pressure, when running, but will not hold the fuel in the lines.
10-15-2007, 07:36 PM
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aight...got the truck back...my mechanic tested the fuel pressure..0 psi...at idle...great...got a new lift pump...now it idles at 10psi...is this correct?...i thought it should have a little more pressure at idle...?..thoughts?
10-15-2007, 11:47 PM
#6
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A decent diaphragm lift-pump will hold around six/seven PSI, post-filter with a clean filter.
My piston lift-pump maintains a steady 14/15 PSI drawing from the two factory mounted tanks, and bumps up to 17/18 PSI when drawing from the auxilliary, which is mounted above the flat-bed and draws out of the top, then it is all down-hill from there, so I guess that explains the jump in fuel-pressure.
My piston lift-pump maintains a steady 14/15 PSI drawing from the two factory mounted tanks, and bumps up to 17/18 PSI when drawing from the auxilliary, which is mounted above the flat-bed and draws out of the top, then it is all down-hill from there, so I guess that explains the jump in fuel-pressure.
10-16-2007, 07:37 AM
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pretty sure it's post-filter...alrighty then...thanks again for the help gentlemen...now i feel comfortable with really putting her in the wind...BearKiller, some day i'm gonnna do a piston pump conversion or a high flow pump with a regulator and bypass system...
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