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Fuel Pump, 91 Explorer

tex6tex6 Member Posts: 96
edited March 2014 in Ford
Explorer, 4.0 fuel pump continues to run after ignition is turned off. Have to disconnect battery to stop fuel pump. Fuel pump making humming sound from gas tank.

Relay at fender has been changed with negative results. Appreciate any troubleshooting ideas. Thanks!


  • Mr_ShiftrightMr_Shiftright Member Posts: 64,481
    Well, if it continues to run normally after you turn off the ignition, you have an ignition switch problem more than likely. If it "sort of runs", stumbling and belching, you have a "post-ignition" or "dieseling" problem.

    I don't think the fuel pump is the cause of either of these problems. Disconnecting the battery disables the ignition. If you are "dieseling", disconnecting the battery shouldn't matter, since "dieseling" is actually a condition of ingiting fuel without ignition (which is what a diesel does).
  • teamhurstteamhurst Member Posts: 1
    I had the same problem with my 91 in 94. The relay did the trick. You may try a second new relay, if I remember correctly, there isn't much left between the two.


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