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.
Cut-Off/Inertia Switch: Operation
Ford Motor Co. uses an inertial switch to shut off electric fuel pump in the event of collision or roll-over. Switch contacts are normally closed, but open on impact or roll-over. A reset button is located on the switch assembly. If the electrical circuit trips, the switch must be reset by depressing the button or vehicle will not re-start. Anytime the switch opens, the fuel system should be inspected for damage prior to resetting.
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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