Urgent Fuel problem - need help - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 03-29-2005, 07:05 PM   #1
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Default Urgent Fuel problem - need help

FInally found my fuel pressure gauge to check out my "car running like doo-doo" problem. THe loss of power, bogging down, etc. Well checked pressure with key on engine off, about 40psi. Started the car and holy crud...rapid flucuation between 34-42psi. Revved it up and she just flucuates even higher, up to about 45psi. Then I put the guage on my mom'* 95 N/A Lesabre...40 psi KOEO, and steady at around 40 while engine running, going up slightly when revving up (as expected). The guage flucuation for my car is like bumble bee fast. So while running, on the SSEi, I pulled the vacuum hose off the fuel regulator. Pressure dropped to like a minimum of 32ish, but still going up near 40, needle still buzzing fast.

So what does this mean? I'm thinking regulator is bad, fuel flow is resrticted, or pump is bad. If the regualtor was bad, I'm thinking the excess fuel could be killing my plugs. I don't get spark knock anymore. It just feels like I'm running on less than 6 cyl under load. But today it was really bad.

Thoughts?

TIA
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Old 03-29-2005, 09:32 PM   #2
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The pump is dead. Replace it and I'll bet your problem is solved. As it'* electric, it should hardly fluctuate at all.

Use Gmpartsdirect.com. I've had good luck with them.
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Old 03-29-2005, 10:52 PM   #3
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I agree. Pump is fried.
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Old 03-29-2005, 11:41 PM   #4
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FPR would leak fuel out of the nipple when you pulled the vacuum hose if it was bad.

I'm with CSFiend and Bob Dillon, the pump is in it'* death throws.[/img]
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Old 03-30-2005, 12:30 AM   #5
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damn it, my N/A engine on my 92 does the same thing as DJ'* looks like its time for me too, GMparts direct it is,..............by the way.....DJ how many miles are on your bonne,

thanks,

nicky
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Old 03-30-2005, 06:34 AM   #6
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Quote:
Originally Posted by Ranger
FPR would leak fuel out of the nipple when you pulled the vacuum hose if it was bad.

I'm with CSFiend and Bob Dillon, the pump is in it'* death throws.[/img]
Not to sidetrack [much], but you do mean pulling the vacuum hose off the FPR while the engine is running, correct?...
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Old 03-30-2005, 08:48 AM   #7
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also i would look more into the PSI regulator and fuel filter
check vacumn at the Fuel regualtor
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Old 03-30-2005, 12:21 PM   #8
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Quote:
Originally Posted by neekolas
by the way.....DJ how many miles are on your bonne,

thanks,

nicky
112k miles.
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