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.
The fuel pump is underneath the back seat, lift this seat up pull a black cap off on pass. side and you should be staring at it.
under the rear passenger side of the car, pretty easy to change.
In the drivers footwell , behind the kick panel ( there is an access hole )
Yes , the ELECTRIC fuel pump is inside the gas tank on a 1999 Mercury Mystique
Waiting for my answer
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
inside fuel tank,you can remove rear seat to access it
On a 1998 Mercury Mystique : To the left of your tachometer is the seatbelt reminder light and Under your fuel gauge is the airbag readiness light ( if the light stays on or flashes take your vehicle in to have the airbag ( Supplemental Restraint System , SRS ) system checked out / repaired
In a ( 1996 ) Mercury Mystique the fuel pump shut off switch ( inertia switch ) is in the drivers footwell behind the kick panel by your left foot . There is an access hole through the panel
try checking the fuel filter, it may have been installed backwards.
near fuel thank