Question about 1991 Buick Park Avenue

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Where exactly is the fuel pump relay and fuse? I have no fuel pressure at all, i don't really feel like its my fuel pump, (hoping not anyway, don't want to have to pull the tank). Im thinking its the crank shaft sensor (which i have, just haven't put it in yet). but would like to check the relay and the fuse. Anything else it could be besides the crankshaft sensor? The way it all happened is about 4 months ago, my wife called me, the car wouldn't start. So i met her and just reached across from the passenger side and started the car.. ? Well, yesterday she was on her way home from a garage sale, and the car just died while she was driving, hasn't started since, no fuel pressure at all, no noise from the gas tank when u first turn on the key, i even hit the tank with a rubber mallet while she was trying to start it to no avail...

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  • terry822 Feb 01, 2010

    I don't know if im adding this in the right place on not, but, no, no sound at all from the fuel pump in the tank, i had my wife turn on the key while i listened. I understand that the relay will only let it run for 2 seconds if the engine isn't started. And no, no pressure at all in the fuel line. if the fuel pressure regulator is shot, will the fuel pump still kick on or not? And what about the crank shaft sensor, if thats bad, will the fuel pump even kick on at all?

  • terry822 Feb 01, 2010

    so it's sounding like your leaning towards the fuel pump. I was gonna try the crank sensor as a couple of my friends and a mechanic friend told me stories of how the had the fuel pump replaced but it still didn't work till they replaced the crank sensor. Unfortunately i'm a computer tech and not a mechanic.. if i was as good a mechanic as a computer tech i'd be in like flynn...



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When you turn the key on you should hear the whine of the fuel pump building pressure up in the fuel line. Turn the key to the on position(but don't turn over the starter), turn it off and then repeat two or three times. Get out and see if you have any fuel pressure in the line. If not your fuel pump is either shot or your fuel pressure regulator needs replacing. Have you removed a spark plug to see what it looks like? If it's a light tannish, grey color then it is obviously a fuel problem and I would check as I said above. If its wet and dark colored then it is a spark problem.......or it could be the fuel pressure regulator is letting fuel by as the pump runs so it dumps in the cylinder. If that is the case you will have oil level higher then full and it will smell like gasoline.

Good Luck

Posted on Feb 01, 2010

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  • Brian Anderson Feb 01, 2010

    The fuel pressure regulator maintains a certain fuel pressure in the line and keeps the pressure from dropping when the car isn't running. It would not, however, keep the fuel pump from running when you turn the key on. The crank sensor affects it but only when the crankshaft is turning so if the pump is not coming on before you try and start the car then I am saying it is something else. YOu can check the fuse in the fuse panel that controls the fuel pump and it could be a bad relay but in my experience, more times then not it is your fuel pump. When you drop the tank, you can check the wiring and also make sure you have power going into the fuel pump.

    Good Luck

  • Brian Anderson Feb 01, 2010

    Crank sensors work when the crankshaft is turning. When you turn the key to the on position but don't try to start it, the fuel pump should come on for 2-3 seconds to build up pressure in the fuel line. If it does not run at that time, the crank sensor would have nothing to do with it since the crankshaft is not turning so theoretically should have not affect on if the fuel pump runs or not. when you drop the tank you can try to get power to the fuel pump to see if you can get it to kick on. Or if you can drop the tank enough that you can take off the wire that goes to it to see if you have a hot wire when you turn on the key for the time the pump kicks on priming the system to make sure.

    Or you could see if one of your mechanic buddies has a tester to see if the fuel pump relay is working properly. It will be a 1" by 1" black box in the fuse panel labeled as fuel pump relay on the lid of the fuse panel or else your owners manual.

  • Brian Anderson Feb 01, 2010

    I am leaning on it being the fuel pump. The crank sensor works as the crankshaft is turning and since you say the pump don't come on when you put the key to the on position, the crank sensor should have nothing to do with it since the crank is not turning. See if you got power going back to the line or if one of your mechanic buddies can test the fuel pump relay to eliminate that as your fault.

    Sorry if this is a repost. I had a reply typed up and for some reason my page updated and I couldn't tell if I posted something or not.

    Good luck



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I have a 2004 Daytona 600. It's been sitting for several years. I changed the battery, oil, gas, and spark plugs but it still won't start. Engine turns but don't know of it's not getting gas or fuel.

You should hear the pump in the gas tank turn on for 2 seconds when you turn the key to on, not start. A buzz or hum from the tank area? If yes, the pump is supposed to put enough pressure in the line to the engine and the injectors for the car to start. Maybe not enough pressure if it won't start. Change the fuel filter and try again. If no help, maybe a weak, tired pump. You will need the fuel pressure checked to compare to specs for your model . Autozone and others rent or loan fuel pressure testers.

If no noise from the pump, check the fuel pump fuse, under the hood in the power distribution center or fuse/relay box. In that same place is the fuel pump relay. Locate the pump relay from a diagram on the fuse/relay cover. Hold your finger lightly on this pump relay while someone cycles the ignition key from off to on. If the pump circuit is working right, you should feel the relay click. That should send power to the fuel pump to turn it on for that 2 second period. If you feel it click and the fuse is good, possibly the pump or the pump's ground wire is faulty. If you don't feel the relay click with key turned to on, the fuel pump circuit will have to be diagnosed. Good luck with your project. Let me know how you progress.

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1 Answer

I have no fuel pressure where do i start to find the problem

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