Should I hear the fuel pump run? Not getting pressure - 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 10-11-2005, 07:04 PM   #1
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Default Should I hear the fuel pump run? Not getting pressure

Folks, thanks all for the help. I have a problem with my 94 that I believe is the fuel pump, but I need your help to be sure. It will not run at all. Just turns over and fires once in a while. When I turn it over and hold the needle in on the nipple dealy, I don't get any fuel spraying out. What all should I look at to help narow it to the pump going bad in the tank? Is there a fuse somewhere to check? Also, would a bad fuel pressure regulator cause this? I will replace the filter tonight, but I really doubt this is the problem. Should I hear the fuel pump run when I first turn the key to on? Thanks all! First real problem with the car since buying it.
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Old 10-11-2005, 07:10 PM   #2
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I can't hear the pump on either of my Bvilles. If you suspect a pump or FPR, the best bet is to get a fuel pressure gauge on the rail. They cost $40 at Autozone (made by Actron).

Being that you live in MN with lots of local members, you may want to post on www.mnbonnevilleclub.com and see if anyone near you has a gauge.
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Old 10-11-2005, 07:11 PM   #3
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Have somebody lay under the car where the fuel tank is, and then turn on the key....If you don't hear the pump kick on, it'* either shot or you have a bad relay. Best thing to do is pick up a chiltons manual for your car, they'll have all the specs, I'm quite unsure where mine is right now. lol


G'luck
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Old 10-11-2005, 07:24 PM   #4
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Does anyone know where the relay is located? Is the Chilton'* good enough to trouble shoot with?
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Old 10-11-2005, 07:30 PM   #5
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Before you check any of that stuff look under you car and see if your pump/sending unit is plugged in all the way and has a green clip holding them together. I havd this problem on my bonne. Then from there work up from there with everything until you reach the fuel rail and pump fuse.
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Old 10-11-2005, 11:13 PM   #6
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Is there a lead in the engine compartment meant to be connected to power to run the pump manually to see if it'* working?
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Old 10-11-2005, 11:29 PM   #7
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Yes, there should be an empty green connector hanging out above the battery somewhere. Run a wire (8 guage or something near) from the battery positive to it. I can't remember if that lead goes through the relay or fuse at the moment though.

It should kick the pump on when you do that, key off.
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Old 10-12-2005, 01:39 AM   #8
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That wire will feed the pump and make it run with the ignition OFF (relay de-energized).

You can hook up an ohmmeter to that wire and ground and read the resistance of the pump motor windings with the ignition off, and it should read an open with the ignition on to verify the fuel pump relay changed states.
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Old 10-12-2005, 10:09 AM   #9
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if you want to rule out the fuel pump, you might want to try a direct wire. last week when I had a "no fuel" problem I got a 12v power source ( I used an extra battery or you could use a battery charger ) I unplugged the fuel tank harness where there are 4 wires, purple, gray, black & black w/ white stripe. hook + to gray and - to black. you should hear the pump run. If it doesn't... it looks like you're dropping the tank. If it runs, you'll have to look elsewhere for a power issue. My problem happened to be a bad ground under the drivers side carpet good luck
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Old 10-12-2005, 02:26 PM   #10
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Default OUT.........................STANDING!!!!!!

This forum is just great. I will get a chance to troubleshoot this weekend. Thanks for the input, I'll let everyone know how it turns out.
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