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I finally found the air leak on my van. It was the rubber hose running from the IP to the fuel filter housing. The hose didn't show any clear signs of being cracked and wasn't leaking externally, but replacing it solved everything. The truck only has 84 miles on it. Runs like a raped ape now.

Was just coming back here to follow up and say I traced the extra port to my heaters in the van body. They apparently cut the line to the heaters when they "dismantled" the heat and A/C. On the front/bottom/left corner of the van body directly above the port, you can see where the fuel line...

Thanks for the quick replies! Found a bunch of threads about a problem with a soldered joint in the pickup tube, so I'll check that out. The van just started leaking here a couple days ago after I moved it, so not sure what I disturbed there, but I'll post back. One of the vent line looking...

I'll second that question. I would also like to ask how exactly you applied 5psi to the fuel system, and where you are cracking a line at the injection pump. Are you talking about an injector line from the IP? I am currently battling problems on 2 different 855's. One has a weird slow leak from...