Ford Expeditions generally
do not have a readily accessible, easily located fuel pump shut-off switch like some other vehicles. The fuel system is controlled electronically and shuts off automatically in various crash scenarios and when the ignition is off. There's no dedicated switch for manual override in most models.
Trying to disable the fuel pump yourself requires significant mechanical knowledge and is not recommended unless you are a qualified mechanic. Improperly accessing the fuel system can be dangerous.