Question about Pontiac Grand Prix

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99 PONTIAC GRAND PRIX GTP: Changed fuel pump.. Have no constant power to pump have initial prime and grounds are good... what would make it not have power..

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  • Pontiac Master
  • 22,095 Answers

The cause of this problem could be anything from a faulty pressure control switch to problem in the ECU ,best one here to avoid an expensive repair is to rewire the feed to the relay for the fuel pump,by which i mean firstly you need to find the permanant 12v feed with ignition off then the 12v supply from the ignition and run a wire from a 12v ignition switch supply in the fuse board and run this to the 12v ignition switchable supply ,this will by pass what ever is causing the problem and allow pump to run permanantly once the ignition is turned on ,cant remember exactly what numbers on the relay think it 37 and 80 are the operating pins and the other two are the permant feed and then the feed to the pump .

Posted on Jul 09, 2010

  • tqab Jul 09, 2010

    How do i find the #s 37 and 80... the fuse box is numbered in columns and rows and the numbers dont go that high.... there are no numbers on the pins

  • Colin Stickland
    Colin Stickland Jul 10, 2010

    the numbers are on the bottom of the relay,not on the fuse box,if you cannot find them use a teat light ,one of them cheap ones in the chinese shop is ideal

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