Question about 1992 Mercury Grand Marquis

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After driving, parked 2 hours, won't start, sounds like fuel starvation, turns over strongly, changed plugs, disconnected fuel filter and crank little or no fuel flow....could it be fuel pump or something else? Thanks !!

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There is a safety switch in the trunk. It is called an Inertia switch and sometimes when a door or trunklid is slammed it will trip. The location of the switch-its on the driver side of the trunk and there is a small cutout in the side carpet.

If you have Air ride the Inertia switch is usually mounted next to it. There is a reset button on it and you just press and hold the button down for a few seconds. The other switch for the Air ride will have an Off/On switch and it is not the switch you want. Before closing the trunklid, turn the Ignition key to the Run position. You should hear a little whirring sound, then try to start your car.

You can then shut your trunklid and do what you want. Its fixed. The switch has a Magnetic ball inside which makes contact for the fuel pump to work. On impact, the Magnetic is knocked loose and the power to the fuel pump is cut.

Posted on Nov 10, 2010

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