Inertia Fuel Shutoff Switch: Description and Operation

Engine Control Components

Inertia Fuel Shut-off (IFS) Switch

The IFS switch is used in conjunction with the electric fuel pump. The purpose of the IFS switch is to shut off the fuel pump if a collision occurs. It consists of a steel cone held in place by a magnet. When a sharp impact occurs, the cone breaks loose from the magnet, rolls up a conical ramp and strikes a target plate which opens the electrical contacts of the switch and shuts off the electric fuel pump. Once the switch is open, it must be manually reset before restarting the vehicle. Refer to the Owner's Literature, Roadside Emergencies for the location of the IFS switch.

Typical Inertia Fuel Shut-off (IFS) Switch:

Typical Inertia Fuel Shut-off (IFS) Switch