If it is 3.0 (not sure if same on 3.5) it is on top of the frame underneath backseat driver side. On the side of the frame you should see two bolts holding a bracket on to the filter to keep it in place.
I have a 2001 montero sport xls and I found out today it does have a plug in the bottom of the fuel tank
The fuel filter is located on the drivers
The fuel injectors on a 2001 Mitsubishi Montero Sport are located on the top, back side of the engine. They connect directly to the cylinder and provide fuel for combustion.
The fuel pump on a 2001 Montero Sport is located inside the fuel tank. Its position allows it to more easily transfer fuel by pushing it toward the engine rather than pulling.
THE FILTER IS LOCATED INSIDE THE GAS TANK.
The fuel filter is on the drivers side behind the rear wheel on top of the frame rail ner the gas tank.It is hard to get to unless you jackup the drivers rear side.
wright behind the full tank above the rear
The Montero was made by Mitsubishi
The fuel filter is in the gas tank, along with the pump. You will not be able to change this filter, unless you change the pump too.
It is inside the fuel tank.
Above the fuel tank on the inboard side.
is located down the car in the middle of the chassis near the differential between the front and rear doors.