1997 F350 crew 4x4, 7.3 turbo fuel system
 

looking for help :-winkwith 1997 7.3 fuel system, after parking the truck at night the diesel fuel will transfer from rear tank to front tank! changed the FPR with a new one, and found a broken spring in the old FPR.
But is the frame rail tank switch/selector (front/rear) gone bad, or stuck? I'm thinking the diesel siphoned through the FPR and returned to the front tank. I'm in Alaska and the truck is parked in a gradge at night about 65 degrees. the tank selector would be on the front tank at night when this fuel tranfers to the front tank from the rear tank.

1994.5 - 1997 7.3L Power Stroke Diesel - Ford Truck Enthusiasts Forums You would probably be better posting your problem on this page. I would bet there are guys there that have had that problem.
Good luck.