If The Engine Cranks But Does Not Start Or Does Not Start After A Collision; The Fuel Pump Shut-Off Switch - Ford Ranger Owner's Manual

To prevent electrical shock, do not use your heater with
ungrounded electrical systems or two-pronged (cheater)
adapters.
For best results, plug the heater in at least three hours before
you start your vehicle. Using the heater for longer than three
hours will not damage the engine, so you can plug it in at night
to start your vehicle the following morning.
NOTE: Be sure to disconnect the engine block heater before
driving your vehicle.
If the Engine Cranks but Does Not Start or
Does Not Start After a Collision

The Fuel Pump Shut-off Switch

If the engine cranks but does not start or does not start after a
collision, the fuel pump shut-off switch may have been
triggered. The shut-off switch is a device intended to stop the
fuel pump when your vehicle has been involved in a major jolt.
Once the shut-off switch is triggered, you must reset the switch
by hand before you can start your vehicle.
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