Question about 1998 Mercury Grand Marquis

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Fuel pump switch overly sensitive is there a fix

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You can bypass the inertia switch or replace it. Bypassing the switch is NOT recommended since it is a safety switch to cut the fuel pump off in case of a rollover type accident.

Posted on Nov 06, 2014

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Where is the emergency fuel shut off switch located on a 1993 chevy suburban?


There is no emergency fuel shut off switch on your vehicle , ford vehicles have one , called inertia fuel shut off .
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If there is no pressure at the fuel injection manifold, it indicates that the fuel pump is not being activated when you turn the ignition switch to start. This condition may be caused by a blown fuse, a bad ignition switch or wiring to the fuel pump, or a failed fuel pump. Check the fuse, then check the fuel pump by disconnecting the electrical connection at the fuel pump and applying a 12V battery source to the fuel pump. If the pump works, check the ignition switch and the wiring.

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Some cars have an inertial shut-off switch for the electric fuel pump. That switch is sensitive to impact and is designed to shut off the fuel pump in case of collision.

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Most vehicles are equipped with what is called a fuel power inertia switch. It is a basic component that shuts down the fuel system during an accident to prevent fuel from being an factor during sensitive times. You may have to find and flip or replace this switch. I do not know the location of it on this particular model off hand, but if you consult your service manual you should be able to locate it quickly.

NOTE: on most vehicle it is located under the dash near the glove box. On some near the fuse box. On cars it is commonly in the trunk.

Thanks for using FixYa, if this solution does not work please feel free to come back and try again.

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I would first change the fuel filter could be clogged over time.
When you first turn the key in the ignition switch. Listen for the fuel pump in the tank should be turning on. You may have to get under the car and listen to the fuel pump coming on when some one else turns the key. The fuel pump should turn on a few seconds before trying to start. IF the fuel pump is coming on. The fuel pump itself is not holding the pressure anymore after sitting a while.
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