Hey all,
Been having some issues with the 6.9 I own, seems to be sucking air at times and when parked seems to lose prime. Just started a few months back already did injectors and the fuel lines look good. I just replaced the lift pump since it was leaking oil and I figured that was the problem. It ran great after I put the pump in then when I got fuel it started the surging/light smoking thing.(new fuel filter already didn't help) this problem is not constant, truck does not miss and the water separator has already been by passed. When I fill the tank I have to go slow on the nozzle or it "burps" out the neck, is there a breather valve on the fuel tank that could be clogged that could cause fuel starvation/air ingestion?

 

posable air in return lines.. i have new return lines and mine still does it

 

Already changed those after I bought it since they were leaking that was over a year ago, guesss I'll have to do some more chasing. Just looking for ideas on where to start.

 

you already nailed all the normal culpruts. have no idea now.

 

Hellbilly, got mine narrowed down to between the tank and filter housing, think its one of the metal lines plan on working on it in a few weeks I'll keep you posted

 

I replaced all the fuel lines with Gates Bio- diesel line... truck runs freekin awesome...

 

might be fuel feed pump

 

does it do it on both tanks or just one ?

 

mine was only doing it on the rear tank... but I replace all the fuel lines with boi-diesel line .... now she dont miss a beat... and I'm killin P.S. trucks with turbos.... mine is a N/A..... I think that is just awesome..