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Old 05-06-2009, 05:00 PM
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Join Date: Jun 2007
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Default 5.7 vortec fuel pressure

I have a 98 z71 pickup, 5.7 vortec. can someone tell me what the fuel pressure should be? with key on engine off it is 56, with engine running it is at 52 for a few min then drops to 42 at which point it quits. fuel filter is new. Thanks, Russell
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Old 05-06-2009, 08:30 PM
Mike Sigmond's Avatar
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Location: Orange County, CA
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Could be a bad pressure regulator or pump. That 55psi pressure reading sounds about right when the motor is off then it cant keep up when running.

Just my 2 cents, lets see what the pros have to say.
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Old 05-07-2009, 03:28 PM
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Join Date: Jan 2009
Location: East Texas
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When I first got my truck the pump and regulator were bad. If it takes a while to crank, but kinda starts faster if you give it some gas, it's the regulator. If it starts fast, but the fuel pressure problem is still there, it is the pump. What problems are you experiencing that made you check the fuel pressure? The drop you are experiencing was the fuel pump for me. Is the dying part the only problem you've experienced so far? I say the pump is the problem. The Fuel pressure regulator (fpr) is cheaper though. About 50 at autozone or oreilly compared to a 300 dollar fuel pump.
1998 Chevrolet Silverado
Long bed Extended cab
5.0 V8
199,900 miles
19 mpg

2008 Ninja 500
8700 miles
consistent 55 mpg

The new Project. (complete)
2001 Dodge Ram 1500
Short bed single cab
3.9 V6
89,000 miles
19 mpg (hmm...weird...)

Originally Posted by EvansBlue View Post
lol oh ok. I misunderstood your false misunderstanding
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