Question about 1998 Pontiac Grand Prix

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1998 Grand Prix 3.8 supercharged fuel pump wont run after starting engine. The pump runs for 2 or 3 seconds when the key is turned on but after starting the pump does not come back on.

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  • rjohnsonjr Jun 22, 2009

    Thats what I thought but I have replaced the pump and filter. Still the same. The fuel pump is not getting power to turn on after the engine is started.

  • rjohnsonjr Jun 25, 2009

    Tried that too I am starting to wonder about the pressure regulator but I can't find any information on location or checking the operation of it. Any Ideas?

  • rjohnsonjr Jul 24, 2009

    Well after a new fuel pump, filter, pressure regulator, and fuel pump relay I got the car to throw a code and had to replace the TPS. Engine still starts and dies within 30 seconds. I bypassed the relay right next to the fuel pump relay labled F/PMP SPD CONT when I did this the car ran perfect but I don't know what I am bypassing. Does anyone know what this relay does or what controlls it?

  • rjohnsonjr Jul 27, 2009

    diagjunkie, I found a pontiac tech that told me it was the resistor. Before spending $80.00 on a resistor I would like to read the old one out with a meter. Do you know where the resistor is located. My wiring diagram does not even show this circuit. Excelent advice by the way and many thanks. I am running the car with this bypassed right now hope that doesn't hurt anything. Again thank you for the help.

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It should be located on the outside of the frame rail,forward of the right front tire. It should look like a ceramic type ballist with a pigtail and one bolt holding it on. If the pigtail has a connector dont forget to check for water, rust, etc. also check for wire damage. It should be the culprit though since by jumping the relay you are in theroy bypassing the resistor. I hope this is correct I didnt have time to pull a diagram and look at it but I am pretty sure this is correct. Thank you for your vote and comment. I hope this helps, good luck my friend.

Posted on Jul 27, 2009

  • carl Jul 27, 2009

    It should be located on the outside of the frame rail,forward of the right front tire. It should look like a ceramic type ballist with a pigtail and one bolt holding it on. If the pigtail has a connector dont forget to check for water, rust, etc. also check for wire damage. It should be the culprit though since by jumping the relay you are in theroy bypassing the resistor. I hope this is correct I didnt have time to pull a diagram and look at it but I am pretty sure this is correct. Thank you for your vote and comment. I hope this helps, good luck my friend.

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That relay is the fuel pump speed control the pcm energizes and deenergizes it depending on fuel volume needed. I am assuming you have changed that relay if so you have a problem with the resister or wiring maybe even pcm. Sounds like before you jumped it there was not enough system voltage. I suggest if you are familliar with electric you get a good wiring diagram and specs to locate problem. When I go to work I will see if I can get a wiring diagram to better assist you there maybe a bad ground.

Posted on Jul 25, 2009

  • carl Jul 27, 2009

    wow first time I had to answer back somehow it deleted my original post and posted the new info twice. I wonder if there is a section where you can get a fixya solution expert to get a solution haha. Had to make a joke.

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It sounds like the fuel pump is shot. it might also be a plugged fuel filter but if it hasent been changed in a while it will wipe out the pump. the pumps are located inside the tank and sometimes there is an access panel located under the carpet in the trunk so you won't have to drop the tank

Posted on Jun 22, 2009

  • Joshua Schofield Jun 23, 2009

    It may also be the fuel pump relay and is located under the hood with all the other electric relays under a plastic cover

  • Joshua Schofield Jun 26, 2009

    The regulator should be on the end of one of the fuel rails with a vacuum hose attached to it. Its controlled by engine vacuum so I would check to see if its getting a vacuum signal. and check the lines that connect to it to make sure they are not cracked. Also the more I think about it, I would also check the key switch. I've seen where it doesnt make good contacts anymore and creates electrical gremlins pop up everywhere

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