6.4l hpfp fuel leak HELP! - Ford Powerstroke Diesel Forum
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Old 04-23-2011, 08:09 PM
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Exclamation 6.4l hpfp fuel leak HELP!

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

Last edited by charlie-2; 04-23-2011 at 08:11 PM. Reason: fuel rails
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Old 04-24-2011, 06:45 AM
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bummmmmmp!
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Old 04-24-2011, 08:55 AM
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The supply and return lines to the HPFP are very weak in the banjo fitting area, ford started with copper washers and then switched to viton and the torque spec changed to a lesser number. alot of times when the lines are undone and then reinstalled if you look at these lines they will be oval and not flat. before you drop the cab and install the shield over the lines fire the fuel pump on the rail and let it run for 10 min. this will find any leak on the supply side and also help prime the system. good luck
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