Where you can find a fuel system diagram including the location of the filter?

Typically, car dealers (in their parts department) have access to diagrams for all sorts of systems (including fuel, wiring, ignition, brake, driveline, etc.). Usually it's as easy as pulling it up on the computer programs they have. They can even do this for older vehicles, though some dealers have limits for how far back they'll go. You should also be able to find one, with some extensive Googling.