Fuel Filter/ Tyre Pressures

[braveheart]

Chaps, Am about to change the inline fuel filter on my 1986 350 s2,( the one next to the pump at the rear of car)and was wondering how to go about it considering the thing is under high pressure.I cant seem to find the area where the fuse is for the pump?Any suggestions would be grateful.Finally, what would be suggested tyre pressures front and back for this vehicle?Thanks

[braveheart]

Thanks for info