F 250 4WD LD Pickup V8-281 4.6L VIN W EFI (1997)
Inertia Fuel Shutoff Switch: Description and Operation
Typical Inertia Fuel Shut-Off Switch
Description
The inertia fuel shutoff switch:
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is used in conjunction with an electric fuel pump.
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shuts off the fuel pump in the event of a collision.
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consists of a steel ball held in place by a magnet.
Operation
When a sharp impact occurs:
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the ball breaks loose from the magnet, rolls up a ramp and strikes a target plate which opens the electrical contacts of the inertia fuel shutoff
switch and shuts off the fuel pump.
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Once the inertia fuel shutoff switch is open, the inertia fuel shutoff switch must be manually reset before restarting the vehicle.
If a collision occurs:
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the electrical contacts in the inertia fuel shutoff switch open.
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the fuel pump automatically shuts off, even if the engine does not stop running.
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the engine will stop a few seconds after the fuel pump stops.
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it is impossible to restart engine until the inertia fuel shutoff switch, located on the LH side lower back panel in the luggage compartment, is
manually reset.
NOTE:In the reset position, the button can be pressed an additional 1.59 mm (0.0625 inch) against a spring. This is a normal condition.
WARNING: Do not reset the inertia fuel shutoff switch until the complete fuel system has been inspected for leaks or damage to vehicle or personal
injury may occur.