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5.7 vortec fuel pressure

Rca1965's Avatar
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May 6th, 2009, 5:00 PM   #1  
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

Mike Sigmond's Avatar
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Orange County, CA

May 6th, 2009, 8:30 PM   #2  
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.

98white5.0's Avatar
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East Texas

May 7th, 2009, 3:28 PM   #3  
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.

Clifford Coen's Avatar
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February 22nd, 2017, 3:29 PM   #4  
Stumbling on accelerating

I have the same issue with my 2000 escalade. You put to your foot to the floor and it acts like it is has no fuel but as soon as you let off the gas it will pick back up till you touch the gas again,only you could bump it and it acts out. I also noticed it jerking and I get an occasional backfire but only on wot. I've been fighting this thing for months with no avail.
I've tried fpr,injectors. I'm doing a fp test tonight. So far at idle I get 50 psi and accelerating in park it goes to about 55-62. Any suggestions I'm really getting sick of this. I'm embarrassed tho drive it.

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