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should fuel pressure stay the same

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Old Jan 10, 2005 | 02:12 PM
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From: tn
Default should fuel pressure stay the same
should my fuel pressure stay at 58-60 psi from idle all the way through the rpm band also when at idle should it stay the same when it revs up? the problem i am having when at idle it reads at 58-60 psi but when i rev it up it drops down to 40psi i dont know what it is doing while driving because i havnt driven it with it doing this cause i dont want to mess anything up thanks for any help also i have a 2001 ls1 engine in a 93 chevy pickup truck with a 255lph fuel pump inline no intank pump
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Old Jan 10, 2005 | 04:11 PM
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Shouldn't drop below 52ish...somethings not right..did you install a return line? Regulator?
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Old Jan 10, 2005 | 04:54 PM
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mine drops to 52 psi in WOT when spraying the 150 wet shot, but it bounces back to 60 psi.
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Old Jan 10, 2005 | 08:23 PM
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i have a areomotive fuel reg and a return line. do you think my fuel pump is giving in it is a nos inline fuel pump
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Old Jan 11, 2005 | 02:49 AM
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From: Centrifugal City
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Your pumps aren't keeping up.
Whether it's dropping to 52psi or 40psi, you don't have enough flow.

40psi is motor popping bad tho.
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Old Jan 11, 2005 | 07:34 AM
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That pump is plenty big to feed your engine. I suspect that when you are accelerating your pickup is getting uncovered and your pressure is dropping.

Andrew
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Old Jan 11, 2005 | 11:56 AM
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I have a full tank of gas this is also at idle when i rev it up.
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Old Jan 11, 2005 | 12:44 PM
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Sorry, didn't note the 'at idle' comment. There should be a diff problem. Electrical? Bad pump?
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Old Jan 11, 2005 | 12:49 PM
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I just had the same problem. Turned out that the intank feed hose had a split in it. Have you ever pulled the intank pump?
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Old Jan 11, 2005 | 03:36 PM
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yes i pulled the intank pump out and replaced with a good size fuel hose. that tank is full so i guess my pump is going out it is whining really loud now.
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