Ford Guy
Registered User
I have a 1987 6.9 diesel, that if you leave sitting over night when you go to start it, it cranks and fires, and feels like it starts but after a few seconds of running stalls and dies, and then it is extremely hard to start. I am sure it is air in the lines somewhere but what i need help with is trying to figure out where it is getting air at. The return caps are slightly leaky and there appears to be diesel in the valley pan, non related leak to the return caps. any ideas where the air might be intruding at, or possibly any other ideas as to what could cause this to happen? its got me stumped and it usually only does it after the engine has cooled and sets for at least 18 hours. Its got me stumped, any help would be greatly appreciated.