Question about 1992 Mercury Grand Marquis

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1989 mercury Grand Marquis fuel system

89' Merc G.Marq. rotates but wont start. no sound from the pump, straight wired the pump, pump runs but wont run when properly connected to harness at the tank. change fuse, where's the fuel pump relay on this car?

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  • 3 more comments 
  • Anonymous Mar 12, 2014

    the fuel gage quit working after I filled the tank

  • Anonymous Mar 12, 2014

    after a fill up my gas gage quit working

  • Anonymous Mar 22, 2014

    no power to the fuel pump on a 1989 wrangler

  • Anonymous Mar 25, 2014

    changed fuel pump,filter and relay but still acts like it runs out of gas ,but when I turn the key off and on runs fine for few minutes

  • Anonymous Mar 28, 2014

    it's slow acceleration, pulsates and shudders up hills, chokes and gags at 80mph which is its top speed. 4.6l mercury grand marq 96.

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  • Mercury Master
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The fuel pump relay is under the hood in the MAXI fuse box, it is a black box with a huge wiring bundle comming out of it.

Posted on Sep 04, 2008

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1 Answer

How would I test fuel pump I changed fuel filter 89 grand Marquis


    If your car died suddenly while driving, it is one thing, if it just didn't start one day, it is another, but given you have not given enough information, start here. Always check fuse first, this will tell you if pump is shot in most cases. Then check fuel pump relay located left fender under hood in fuse box. There are three relays as I recall, and if fuse was good, then more than likely it is relay, if I recall, two of relays are same type, so swap positions to diagnosis, you should be able to hear the fuel pump running, so get a gift wrap paper tube and put it near fuel pump location on gas tank and you should hear it easily, so this will further narrow down problem if you can't hear it run.

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