Inertia Fuel Shutoff Switch: Description and Operation

ENGINE CONTROL COMPONENTS

Inertia Fuel Shutoff (IFS) Switch
The purpose of the IFS switch is to shut off the fuel pump if a collision occurs. It is located in the right hand side of the instrument panel and consists of a steel ball held in place by a magnet. When an impact occurs, the ball breaks loose from the magnet, rolls up a conical ramp and strikes a target plate opening the electrical contacts of the switch and turning off the electric fuel pump in the fuel conditioning module. Once the switch is open, it must be manually reset before restarting the vehicle. To reset the IFS switch, push the button on top of the switch down.