Ford Mustang/Capri 1979-1988 Repair Guide

Fuel System Inertia Switch


See Figure 1

In the event of a collision, the electrical contacts in the inertia switch open and the fuel pump automatically shuts off. The fuel pump will shut off even if the engine does not stop running. The engine, however, will stop a few seconds after the fuel pump stops. It is not possible to restart the engine until the inertia switch is manually reset. The switch is located in the luggage compartment on the left hinge support of 2-door sedans or in the spare tire well of 3-door sedans. To reset, depress the button on top of the switch.

In the reset position, the button can be depressed an additional 1.5mm (1/16inch) against a spring. This is a normal condition.

Do not reset the inertia switch until the complete fuel system has been inspected for leaks.

Click image to see an enlarged view

Fig. Fig. 1: Inertia switch location