Inertia Fuel Shutoff (IFS) Switch Operation
Inertia Fuel Shutoff (IFS) SwitchInertia Fuel Shutoff (IFS) Switch:
The inertia fuel shutoff (IFS) switch (Figure 87) is used in conjunction with electric fuel close valves. The purpose of the IFS switch is to close the fuel shut-off valves if a crash occurs. It 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 conical ramp and strikes a target plate which opens the electrical contacts of the switch and closes the electric fuel shut-off valve. Once the switch is open, it must be manually reset before restarting the vehicle. On some vehicles a fuel reset light illuminates. Refer to the Owner Guide for the location of the IFS.