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What trips the fuel shut off switch on a 2002 Ford Explorer?

The fuel shut-off switch on a 2002 Ford Explorer is primarily tripped by a severe collision. The system is designed as a safety feature to prevent fuel leaks and fires after an accident. The impact from a crash activates the inertial sensor (often called a crash sensor) which then engages the shut-off.

While a severe collision is the primary trigger, it's *theoretically* possible, though extremely rare and unlikely, for other things to cause it to malfunction and shut off:

* Faulty Inertial Sensor: A malfunctioning sensor could falsely detect a crash and engage the shut-off. This is less common, but a possibility.

* Wiring Issues: Damaged or shorted wiring related to the sensor or the fuel pump relay could interfere with the system.

* Low Voltage: Extremely low battery voltage might theoretically interfere with the system's proper operation, though this is generally not a primary cause of fuel shut-off.

It's important to note that if your Explorer's fuel system shuts off without a crash, you should have it professionally inspected to determine the cause. This is crucial for safety and proper vehicle operation. A simple electrical issue is likely more probable than a sensor spontaneously failing, but a mechanic needs to diagnose the root cause.