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At wit's end... fuel pump

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    #1

    At wit's end... fuel pump

    Okay, here's the story so far.

    Fuel pump quit in the Vic wagon. Dropped the tank, changed the pump (Also the FP relay and fuel filter) started up and it ran fine for 2 days.

    This morning, no FP noise and no start.

    Dropped the tank out, made up a new plug for the harness where it meets the fuel pump and the pump works. Car started and then quit.

    Got messing around under the hood and pulled the old hood lock/fuel pump?/ ignition cutoff? security system the car had on it when I bought it and spliced the wires back together. car started and ran.

    Soooo tank back in (had just dropped it a bit with the jack) started up and was coming back down off the ramps when it quit.

    Same as before, crank but no start. No power to the inertia switch, or fuel pump.

    Only thing left we haven't changed out is the actual wire between the front and the back of the car...

    Any thing else you can think of that I've missed?
    sigpic87 LTD Wagon
    Tags: None
    #2
    check the power to the relay under the hood. make sure that's got power before tearing everything else out to replace that wire. Then check that the ECM is actually switching the relay. If both are good... it's probably the wire from the relay out to the inertia switch.

    Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. -- Albert Einstein
    rides: 93 Crown Vic LX (The Red Velvet Cake), 2000 Crown Vic base model (Sandy), 2003 Expedition (the vacation beast)

    Originally posted by gadget73
    ... and it should all work like magic and unicorns and stuff.

    Originally posted by dmccaig
    Overhead, some poor bastards are flying in airplanes.

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      #3
      Do you hear ANY relay click when you turn the key to start it?
      If not, your PCM relay may be fubar as well. (If that is dead, anything the pcm controls ie: fuel pump, won't turn on either).

      Alex.

      Comment

        #4
        Turned out we had pinched the wiring harness to the fuel pump and it was grounding out. A little black tape and we were good to go.
        sigpic87 LTD Wagon

        Comment

          #5
          This is why fusible links are useless and should be replaced with fuses. A normal fuse would've popped. You got lucky and didn't melt any of the wiring.

          Comment

            #6
            Yeah, unlike my light blue car that melted all the wiring from the driver side kickplate all the way back to the rear seat. It also burnt out somewhere and now my fuel pump is running the defroster so I had to unplug the defroster until I can get the back seat out to replace the rest of the harness.
            ,
            Slicktop '91 GS HO 4.30 rear. '82 Mark VI Tudor HO, '90 F-150 XLT, '62 project Heep, '89 Arizona Waggin' and '88 donor in PA, getting combined.

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