Question about 2001 Pontiac Sunfire

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2000 Pontiac Sunfire Fuel pump not working

OK here is the story. 1 1/2 year ago my car drove fine to work 20+ mile, but when I got off work the car would not start. Found that I was not getting any fuel, so I changed the fuel filter, check the relay and fuse and still could not get it to start. Had the car towed home and was just checking the engine harness when suddenly it started working again. not sure what i did if i did anything. anyway, 6 month later no problems, then there is the same problem again. did all the same checks and found nothing. was told to hit the tank with a hammer to see if the fuel pump would start working. after several good hits the pump started working and the car ran fine for the next entire year. Last night I went on a short drive, shut the car down for 10 min, went back to crank it and the problem has returned again. This problem has always had the exact same symptoms every time it happens. engine rotates, hits once or twice occasionally, and fuel pump dosen't operate. so I purchased a fuel pump to put in the car. pulled the old one out and for the sake of being certain I hooked up the new pump to make sure it would operated before I put it in the tank. The new pump DID NOT operate so that left me scratching my head. DId all the same checks as before. I measure 12 volts to all fuses in the box, relay clicks and was interchanged with the a/c relay. measured 12 volts at all fuses and realys in the engine compartment. Hooked up the Snap on scanner and found no codes. also could not get the pump to activate with the scanner. Tried hooking up another fuel pump and still does not operate. I will check for voltage at the pump harness when i tow it home tonight. this car really has me confused, I figure its either a short or open wire OR the computer is being really screwy. Also the fuel fump relay does operated when commanded to either by ignition or by the scanner. Any help would be appreciated.

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  • alizaeteen Mar 16, 2009

    I have this same problem. about every year it does this same thing but I haven't had the money to take it to the dealership. I don't know why it does it. Did you find out how to fix the problem because my car is still not working.

  • davdmad Sep 18, 2009

    Found the problem to be the fuel pump wiring. A good look at the schematics in a Haynes manual helped me to identify the correct wires. I spliced in a 12v wire from the fuse box and spliced in another ground. Put a toggle switch on the hot wire. Have had no problems running the car this way, I did not cut any wires on the factory harness.

  • fetchnfun
    fetchnfun Jul 11, 2013

    We found that the wiring right at the wiring harness was loose. There are 2 gray wires that connect and if they get loose at all they can cause intermittent problems. And of course this wiring harness just happens to be right where most drivers rest their left foot. Once we located the issue we soldered the wire right to the pin so that there was no way it could come loose and now the car runs great.


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Check and see if you have an emergency shut off in the trunk. it will be on either side of the finder wall. it is there in case you get in a accident. the button pops up. make sure the button is in all the way. that shut off might be your problem.

Posted on Mar 02, 2009

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After reviewing this site and one other similar site, I noticed many folks having problems with fuel pumps and erractic dying of the engine. My 01 Sunfire had similar problems. After the fuel pump was replaced, the car would run fine and then up and die while driving or while accelerating from a stop, or not start at all after cranking. I took it to the dealership after the engine died going 65 mph on the highway during rush hour. Thankfully, I did not get creamed. The car would not restart at that time. So it was towed to the dealership and no codes shown; the darn thing started up fine for them each time they tried during the three days they kept it. Finally, after much insisting and some luck - as they said it would be impossible to locate the gliche as too many possibilities, the engine did show some codes. They replaced something in the computer switchboard (sorry, guys this female braind does not rememeber those details - been a few years back; cost $300 is what I do remember) and the car has run perfectly since then. Knock on wood. Hope this helps.

Posted on Mar 19, 2009

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