Inertia Fuel Shutoff (IFS) Switch

Inertia Fuel Shutoff (IFS) Switch

Figure 67: Pulse Damper:

The fuel rail pulse damper (Figure 67) located on the fuel rail reduces fuel system noise caused by the pulsing of the fuel injectors. The vacuum port located on the damper is connected to manifold vacuum to avoid fuel spillage in the event the pulse damper diaphragm were to rupture. (The pulse damper should not be confused with a fuel pressure regulator, it does not regulate fuel rail pressure.)

Inertia Fuel Shutoff (IFS) Switch

Figure 68: Inertia Fuel Shutoff (IFS) Switch:

The inertia fuel shutoff (IFS) switch (Figure 68) 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 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 shuts off the electric fuel pump. Once the switch is open , it must be manually reset before restarting the vehicle . Refer to the Owner Guide for the location of the IFS.