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 Pump Shut-Off (Inertia) Switch
All models use an electrical interrupt switch in fuel system. During a collision or vehicle roll-over, electrical contacts within inertia switch open, shutting off fuel supply to electric fuel pump. Fuel supply is interrupted even when engine is running.
A reset button is located on switch assembly. If electrical circuit trips, vehicle will not re-start until switch is reset. Fuel system should be inspected before resetting switch.
On Aerostar models, inertia switch is located in right kick panel. On "E" Series models, inertia switch is located on right cowl panel, near front of door. On Bronco and "F" Series models, inertia switch is located on left toe board, near parking brake assembly. On Ranger and Explorer models, inertia switch is located on toe board, near right side of transmission hump.
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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.