[redwood]

Fuel pumps and filter assembly are under a cover under the car in front of the pass. side rear wheel.
Cover needs to be removed first. 8mm plastic nuts.
You should familiarize yourself with this area so it will be easier when time to change filter.

I still recommend Proper dignostics, things like a faulty temp. sensor will all be told. Also examine that harness. There are a hundred discount MBZ sources on the web.