Thread: Aftermarket fuel pump has different electrical connector, need to find stock one

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  1. #1 Aftermarket fuel pump has different electrical connector, need to find stock one 
    Donating Users NotEnoughGPs's Avatar
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    Was there ever a known issue with the stock 4 wire square electrical connector that goes to the fuel pump? I recently bought a '03 GTP with 187,000 miles, and I went to replace the fuel pump with a working pump from a '01 GTP. When I pulled the pump from the '03 and saw the aftermarket pump, I was stopped in my tracks. The owner had an awful Airtex brand pump installed, no wonder he had problems. Even the fuel sender is a different style and can't be replaced with a AC Delco one.
    Anyways, as I was researching fuel pumps for the GP's, one comment made was that a number of Grand Prix and other W-body owners had problems with the AC Delco fuel pump and it was due to the electrical connector design. I was like "uh", never heard of this.
    Now, I got to cut the stock connector off another GP, but can't locate any model years close to the 2003.
    What years used the same fuel pumps?
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  2. #2 Re: Aftermarket fuel pump has different electrical connector, need to find stock one 
    GTX Level Member industrialfish's Avatar
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    You can use the plug from a O2 sensor also.

    There is a TSB somewhere about the square plug design not making good connection and causing wires to melt. Because of this a lot of pumps, including OEM replacements come with the flat 4 plug on them and an included harness to splice in.
    2005 GTP - Graystone Metallic|SPO grills&spoiler/SE lip/Carbon Fiber INFERNO hood
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  3. #3 Re: Aftermarket fuel pump has different electrical connector, need to find stock one 
    Donating Users NotEnoughGPs's Avatar
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    Thanks for that info about TSB's. I knew they existed, but never really bothered researching them. I found a list of TSB's for the Pontiac Grand Prix, by year. Interesting that I have owned these cars since 1999 and really never bothered looking into these TSB's. I can consult with some local long time GM mechanics about some of the bulletins to see if they can help diagnose certain problems.

    http://www.pontiacproblems.com/tsbs/Grand_Prix/2002/

    Concerning the TSB on the square fuel pump electrical connector and the overheating problem on fuel pumps, I am going to remove the upgraded flat plug and install the 4-pins square plug as I have never had an issue with overheating with any electrical connector or any lack of power to the fuel pump on the Grand Prix's I have owned. Besides, I have a number of pumps from GP's that I know operate fine and I don't want them to go to waste.
    Last edited by NotEnoughGPs; 11-21-2017 at 04:15 AM.
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