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The Ford Ranger inertia switch does not have any known issues. What is an inertia switch and what does it do, you might ask. Inertia switches are commonly used in vehicle fuel systems to turn off the fuel pump in the event of a collision, reducing the risk of fuel leakage and fire. You may also be curious if an inertia switch can malfunction. Although rare, it is possible for the inertia switch to fail. If you are replacing a faulty fuel pump, the inertia switch should not be a concern unless it has been triggered by an accident, hitting a pothole, or a strong impact from another vehicle.
It appears that many Ford Ranger inertia switches for the fuel pump are malfunctioning, leading to the vehicle stalling.