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Pontiac Grand Prix Fuel System



  • Has anyone delt with the level indicator going from full to empty and not reading anything in between? looking at the part (fuel pump) the sending unit is a part of the pump. I am currently going through the ignition switch replacement due to the heater fan and the console going out (thanks for the info. on this site) and was courious if some one else has had similar issues.
    2001 gtp
  • 2000 gtp error codes po203 (injector circuit open cylinder 3) and po303 (cylinder 3 misfire) i think i need to replace injector # 3 and was wondering if anyone has gone thru this procedure? looking at the chilton manual it seems possible to do on my own i am just a bit confused on if i need to remove the whole fuel rail assembly or can i just pull out injector # 3 by itself without taking off the fuel rail. if anyone has any info on this it would be greatly appreciated.
  • susy93susy93 Posts: 1
    I am having problems with my 2002 pontiac grand prix. I lose acceleration on hills when i push the gas pedal the rpms go up but i lose acceleration. Today coming home I slowed to turn on to my road off highway and it died. I got it started after a bit and got it almost home but had to slow down and it died again. I was thinking fuel pump or filter? Any suggestions?
  • billybillbillybill Posts: 2
    Hey man, I've had the same problem with my fuel gauge. When I start my 2000 Grand Prix GT, the fuel gauge shows completely full but with in a few minutes of it running, the gauge drops to empty & the low fuel warning comes on.
    I purchased & installed a OEM GM sending unit, but it still did the same thing. A few weeks after that my fuel pump went out so I replaced it with 1 from Auto Zone which come with a sending unit attached. I was really hoping this would fix my problem but it hasn't.
    So for months now I've been keeping up with my mileage so I dont run out of gas, but this is getting very difficult as HIGH as gas is now.
    If anyone can let me know what I need to do, PLEASE HELP ME OUT & DROP ME A LINE.
  • My wife has a 99 GTP, she has the same symptoms as your 2002. To make a long story shorter, I used to have a GTP of my own and that thing had one incedent where it wouldn't start..... took it to the sercvce dept installed fuel pump, regulator and it still wouldn't start.... finally I spoke with a vetran GM mechanic and he said it was the FUEL PUMP RESISTOR...... Indeed it was. Now my wife's car will start but it will die on occaision (non electrical) It is the Resistor again. Here is the kicker, the resistor is only on the GTP models and it seems like no parts stores can find it..... .GO TO A GM DEALER AND TELL THEM YOU NEED A FUEL PUMP RESISTOR, should be around 50 bucks and it is located in one of the fender wells inside the engine compartment. Can almost garantee thats what it is
  • mkchickmkchick Posts: 1
    My 2002 Pontiac Grand Prix GTP Supercharge was having some problems while driving this past week. It would cut out at 70mph then just kick back on or die. I would pull over and did not have any problem starting the car back up. I turned the AC off and anything else I had on and put the windows down. I notice the smell of nasty eggs. I knew it was my catalytic converter going out. I got on the phone and my husband told me that since the car was under 80,000 miles I was still covered it was just a matter of getting the car back to the dealership. I hauled it in on Saturday and get a call on Tuesday that my car would not start so they checked it and the fuel pump is almost gone. They said they had the hit the fuel pump just to get my car to start. They replaced the converter and I told them to not touch anything else. They wanted $850.00 tor replace the fuel pump. Can this really happen? Can my car go from starting fine to not starting at all? I am going to pick the car up so any one that has any advice I would sure appreciate it.
  • heavyphdheavyphd Posts: 1
    I have a 2002 GP GT. At 82500 miles I had a similar issue (I also had random misfires on the OBD II). Mine turned out to be a 'clogged' Catalytic converter. I got that changed out, as well as a tune up, and the issue went away.
  • ragellaragella Posts: 3
    Afternoon all! I have a 01 GP GT. The problem i'm having is that the fuel guage sticks(works when it wants to). I work for autozone, so I went ahead and picked up myself a new wiring harness (was told that the GM ones go bad) After waiting for the tank to be near empty, I dropped it. Boy was that a fun task. And, here is the best part - I start removing the old harness from the pump, and realize the pump, and the new harness aren't the same. So, I go back to work and do some homework - GM stuck a GTP fuel pump on my car. . . Any ideas as to why? :confuse:
  • I have an 04 GP 66k miles. My wife drives this car mostly. She told me it had a slight miss. I drove the car and it does have a slight miss and the check engine light came on. I replaced the front spark plugs. I could not get to the back three. The repair shop said the pigtail on #5 injector needed to be replaced. The code I get is P0205. The replaced pigtail did not fix the problem. So now it could be one of a few things. Plug wire on #5 Fuel injector, or coil. Any suggestions? I know at this point the most expensive fix will be replacing the fuel injector.
  • Dude or Dudet,

    it's your mass air flow sensor. Trust me, i've repaired a million already. Easy test is to just unplug the mass air see if it runs fine, if so replace mass air.
  • hey i am having same problem with my 2002 GP GT.just wondering if you have since fixed problem and what was problem hope to hear from you soon.anybody know how to fix this ??
  • No luck yet with the problem......
  • No luck yet either on my end. After dropping the tank down the first time to swap out fuel pumps, and noticed I have the fuel pump for the GTP. Go figure, GM trying to save money by using overflow parts. I travel about 280 miles between fill ups. thats my guage.
  • So Ragella you are still having the problem with your fuel gauge not reading correctly after replacing the, wiring harness for the fuel tank, fuel pump and sending unit assembly? I am reading the posts on the fuel gauge problem. I would have guessed the wiring harness would have fixed the problem?

    I have a 2000 Grandprix SE for my daughter.
    I am trying to trouble shoot the exact same problem with the fuel gauge reads full on engine startup and with a couple of minutes goes to empty with the low fuel light on! I even tried swapping out the tank fuel pump assembly with another good unit and still the same issue!
  • Fast Eddie.

    I gave up on the issue after the first time i dropped the tank down, to find out the fuel pumps are different. I work for Autozone, and I did some research. I have the same fuel pump, that goes with the GTP model. I picked up the unit for the GT. It was a pain in the royal, dropping the tank, to find this out. I use the odometer to keep an idea of how much fuel I have. I get roughly 280 miles on a tank. Let me know what you come up with.
  • I just wanted to share this information with all the Grand Prix owners. To access the fuel pump assembly on a 2000 model year & (Other model years), you do not need to drop the tank. In the trunk behind the rear passenger seat there is an access cover for the fuel pump under the trunk carpeting.

    I stopped by my local dealership today and asked about other possible causes for the fuel gage reading incorrectly. The next step after replacing the fuel sender unit and still having the gauge read incorrectly is to trace the wiring up to the front car. Looking for burned spots or animal chew spots in the wiring. The service manager did say they have a special tool to flash the gauge cluster to test for functioning. Cost is $25.00 I would imagine there would be an additional labor charge too.
  • at times while driving my car when accelerating my car jerks before the gear is released and also I can be at a stop sign and my car turns off. It accelerates on its own and decelerates while driving and especially parked and when stopped at a stop sign and light to where it either turns off completely or feels like it will turn off. Could this be my fuel pump or crakshaft?? please help. thanks
  • kamlkaml Posts: 1
    i have a 1993 grand prix 3.1L and it's not getting power to the fuel pump relay when the rest of the relays(AC comp., primary & secondary cooling fans) are getting power. Is there a kill switch or a fuel pump resistor i need to know about?
  • gtp00gtp00 Posts: 1
This discussion has been closed.