90 F250 Fuel problem

[dgh]

My 90 F250 7.3L has a problem on start up that I can't figure out. Engine starts but then dies within a few seconds. Restarting takes a while but then runs fine - figured fuel pump was failing so I replaced but problem remains. No leaks anywhere. It will restart fine if I have driven it within 24 hours or so but after two days for example problem appears.

[91diesel]

After sitting, air slowly leaks into your fuel system somewhere. Search around the forums, theres a lot of posts on air leaks.

[Snotzalot]

Most likely a bad return line cap O Ring, replace the complete set and lines if the first thing to do.