I just aquired a 2004. 5 with 6 speed and 73K miles. It will leave my 96 12 valve slushy box for dead but I have a bit of learning ahead of me on the fuel system. I understand the fuel pumps on these die at unpredictible times or starve the injector pump. I have searched the forums for fuel pump info and am confused about what is realy needed. I went to the Glacier diesel site-- they have the Air Dog --the Boss system and the Walbro. I am staying stock on horse power as I don't need the cost to feed any more. Do I NEED a different filter assembly also? Is air in the fuel a problem at stock power levels? The GFS392 seems to be the easy set up -- ??