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Yes , the ELECTRIC fuel pump is inside the gas tank on a 1999 Mercury Mystique
in the gas tank. remove the gas tank and then remove the fuel pump from gas tank. replace with new fuel pump.
In the fuel tank
In the drivers footwell behind the kick panel ( there is an access hole in the panel ) according to the 1999 Mercury Mystique Owner Guide
near fuel thank
inside fuel tank,you can remove rear seat to access it
Mounted on top and inside the fuel tank. You must remove the fuel tank to replace the pump.
it is above the altenater next to the fuel pressure regulator. it is above the altenater next to the fuel pressure regulator.
On a 1999 Mercury Mystique : No , the fuel pump shut off switch ( inertia switch ) is a mechanical switch that opens the circuit so no power is going to the electric fuel pump * in the Power Distribution Box ( which is " live " ) located in the engine compartment ( # 9 is a 15 amp fuse for the fuel pump , and relay R1 is the fuel pump relay )
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In the drivers footwell , behind the kick panel , where the access hole is through the panel
The fuel pump fuse for a 1998 Mercury Mystique is located in the main fuse panel near the hood release. It prevents the fuel circuit from being overloading and damaging the pump.