Well I have completed the job. My helper was a no show so I did it alone, not hard getting down but GOT-TOW-MAWTY, putting it back was tough. My tank was diff, had a bolt on lid to the pick-up assembly, can't do the vent tube trick because they are steel inthis F-450 tank plus I couldn't even reach them without a screw driver. I used 3/8 inch fuel line from the tank to my WIX filter-separator and on to within 12 inches of the pump where I put a piece of 5/16 line( use 3/8 double barb, sanded down the end going in the 5/16 for a great fit). Double hose clampped all conections. Filled filter with diesel and that baby fired right off. No leaks so far. After 80 miles on a (now) full tank of fuel the engine has gotten quiter, not huge diff but noticeble.