no leaks, but my 7.3 won't start

[86ford7.3]

[1986 F350 XL Single Cab Dually, 7.3 IDI non-turbo, 5-spd man.]

My truck all of a sudden started idling really rough about a month ago, then didn't do it again till a few days ago, now it won't stay running longer than about 10-15 seconds

I replaced all the O-rings on the fuel injectors and a couple bad return lines... no leaks there; I even added a in-line electronic fuel pump made for diesel (by mr. gasket, bought from Advance Auto)

while i do suspect the lift pump is bad, the electronic pump is definitely sending fuel to the filter..

so no leaks and fuel is definitely getting to the engine...

any suggestions ???

 

[BigRigTech]

Fuel to the filter is good but depending on how the return side is plummed it could still be sucking air....It happened to me on my 92 when I replaced the 460 with the 6.9....My advice - replace all the return lines everywhere on the engine. In the short term some clear vinyl line on the in/out lines at the fuel filter while let you see if you have air intrusion....Worked for me....When it die's after 10-15 seconds is the fuel filter empty???

 

[jonathan]

also check your fuel haeter for wetness

 

[86ford7.3]

Fuel to the filter is good but depending on how the return side is plummed it could still be sucking air....It happened to me on my 92 when I replaced the 460 with the 6.9....My advice - replace all the return lines everywhere on the engine. In the short term some clear vinyl line on the in/out lines at the fuel filter while let you see if you have air intrusion....Worked for me....When it die's after 10-15 seconds is the fuel filter empty???

yeah, usually when i pull it off, the fuel level in the filter is around the bottom