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Ford Explorer Community - Maintenance - Modifications - Performance Upgrades - Problem Solving - Off-Road - Street
Explorer Forum Covers the Explorer ST, Explorer Sport, Explorer Sport Trac, Lincoln Aviator, Mercury Mountaineer, Mazda Navajo, Ford Ranger, Mazda Pickups, and the Ford Aerostar
If you are in an accident it will shut off your fuel pump so that it does not keep pumping fuel and possibly start a fire. You just push the button to reset the fuel pump.
Yep- inertia switch. It has a spring inside. When the switch is jarred, as in an accident, it will release, and the button will pop up, preventing the fuel pump from running, so there isn't a massive fireball fed from fuel peing pumped into the engine compartment or onto the ground if the engine is still running after the accident. As tmds said, just push it to reset it (sometimes they go off if you hit a large Michigan pothole...