Sable V6-3.0L VIN U (1999)
Inertia Fuel Shutoff Switch: Description and Operation
Fuel Charging and Controls
Inertia Fuel Shutoff Switch
The Inertia Fuel Shutoff Switch (IFS 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.
When a sharp impact occurs, 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. This shuts off the fuel pump. Once open, it must be manually reset before restarting the engine.
