i have a 2008 f-550 6.4l and it was pouring fuel from the rear of the motor and on top of the tranny. it had a very very slight fuel leak on the 4 lines on the hpfp and the circle the lines are sitting in was filled with fuel so i couldnt get to the lines to tighten them. so after i did my egr delete i started the truck and it was pouring fuel out the back soooo i lifted the cab. the high pressure lines out of 4 there is 2 high pressure lines that go to the heads then the fuel rails, these lines were really loose. the truck ran great but was pouring fuel and i figured if the high pressure lines were leaking then it wouldnt run good.
but is there anywhere else i should look? im replacing all the 4 lines and washers. any help would be appreciated