Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Fuel Pumps: Operation
In the event of a collision or vehicle roll-over, electrical contacts within the inertia switch shut off fuel supply to the electric fuel pump. Fuel supply will be interrupted even if the engine is still running. Switch contacts are normally closed, but open upon impact or roll-over. A reset button is located on the switch assembly. If the electrical circuit trips, it is not possible to re-start the vehicle unless the switch is reset by depressing the reset button. Anytime the switch opens, the fuel system should be inspected for damage prior to resetting.
On LTD Crown Victoria and Grand Marquis station wagon models, switch is located in left rear side storage compartment.
On Mustang, it is located near left taillight.
On Taurus and Sable station wagon models, switch is located behind access door in right rear cargo area.
On all other vehicles, inertia switch is located in trunk, on left hinge support or behind trim panel.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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