F 350 2WD Super Duty V10-6.8L (2009)
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
