FORD 2012 E-450 - Manual (Page 216)

FUEL PUMP SHUT-OFF (EXCEPT STRIPPED CHASSIS)
In the event of a moderate to severe collision, this vehicle is equipped
with a fuel pump shut-off feature that stops the flow of fuel to the
engine. Not every impact will cause a shut-off.
Should your vehicle shut off after a collision due to this feature, you may
restart your vehicle by doing the following:
1. Turn the ignition switch to the off position.
2. Turn the ignition switch to the on position.
In some instances the vehicle may not restart the first time you try to
restart and may take one additional attempt.
WARNING: Failure to inspect and if necessary repair fuel leaks
after a collision may increase the risk of fire and serious injury.
Ford Motor Company recommends that the fuel system be inspected
by an authorized dealer after any collision.
FUEL PUMP SHUT-OFF SWITCH (STRIPPED CHASSIS VEHICLES
ONLY)
This device stops the electric fuel pump from sending fuel to the engine
when your vehicle has had a substantial jolt.
After an accident, if the engine cranks but does not start, this switch
may have been activated.
Roadside Emergencies
216
2012 Econoline (eco)
Owners Guide, 1st Printing
USA (fus)