No Fuel 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 01-20-2008, 11:15 PM   #1
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Default No Fuel Pressure

My 92 SSE is giving me fits. For several weeks it would sometimes start hard, when cranking just giving it a little gas would fire it up and once it starts I need to rev it a little to keep it running. When running to town last night it sputtered a couple times and then died. Tried to start her back up but wouldn't go. I pushed in the valve stem where you check fuel pressure with my pocket knife and gas shot out. Pulled it home and put the battery charger on it, from all the cranking, for half an hour, hooked up the fuel pressure gauge. Turned key to on, had 44 psi, started right up and stayed around 44. This AM went out and turned the key to start, 44 psi, started up and the gauge dropped to 0 and it died. This afternoon tried turning the key to on, got 44 psi, but didn't try to start it. Checked it an hour and a half later and the gauge was still at 35 psi. This evening I hit the key got my 44 psi started it and died. Tried again and nothing. No pressure, can't hear the pump run. Since the pressure didn't drop, when I had it, I assume the FPR is good. Does this sound like the relay? Where is the relay? I put a new gas tank, fuel pump and filter in it less than a year ago. The crank sensor was replaced with in the last couple of years as well. Wasn't too excited about crawling around under it today, kinda chilly. Just trying to get a game plan for later this week when it warms up.
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Old 01-20-2008, 11:35 PM   #2
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First thing you'll have to do is put the year and trim level of your car in your sig. Did you pull the hose off the FPR while checking the fuel pressure? The pressure should rise to the 50'*. How'* your air filter? Throttle body? The relay is located under the dash, to the right of the passengers kick panel. Before messing with the relay you should test the fuel pump with the jumper switch thats behind the battery under your hood. It'* green. take some wire and connect it from the green jumper to the positive terminal on the battery and listen. If that doesn't work then check the relay. You can short terminals 1 and 4 to see if the pump turns on.
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Old 01-21-2008, 10:43 AM   #3
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Let'* clear the air here:


The hose he'* talking about is the VACUUM hose on the FPR. Get the gauge on the test valve and pull that line off at IDLE. Tell us what you get.

Air filter will have no bearing on this problem whatsoever.

Throttle body will have no bearing on this problem whatsoever.

The relay is not an issue as long as it stays energized. It'* obviously working, or you wouldn't get any fuel pressure. To test this, put an ohmmeter from the green connector to ground and turn the ignition on (not start). Watch it for awhile. See if it drops out each time after a 2-second prime on 'key on'. It'll be good.

It'* rare for a regulator to fail like that. It'* a mechanical device, and should be consistent in it'* mode of failure. I suspect your pump. But this doesn't rule out the FPR entirely without more testing.
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Old 01-21-2008, 11:49 AM   #4
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He had no fuel pressure a few times.
Remove the bolts & rubber boots from the battery cable ends. Clean the bolts, cable ends & any spacers with sandpaper or wire brush. Apply dielectric grease to everything and reassemble. In this cold weather you might need to warm the rubber boots with a hair dryer to ease disassembly/reassembly.

You also need to make sure the fuel pump has a good ground. Here'* a link to a Techinfo article on cleaning the ground buses.
http://www.bonnevilleclub.com/forum/...=article&k=102
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Old 01-24-2008, 12:12 AM   #5
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Removed the ground blocks, they looked like the day they were installed but I cleaned them up anyways. The positive battery terminal was pretty cruddy so I cleaned it up. Still the same. Turn key 44 psi, start car, runs a few seconds pressure drops to 0. Turn key again, the pump doesn't run. Now when I go out tomorrow AM I'm sure the process will repeat. Looks like the tanks gotta come out. Sure am glad I used stainless bolts the last time. Thanks for the suggestions guys.
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