7.3 idi starts up then dies

[1978FrankenFord]

Hello i have a 7.3 idi with factory turbo kit and I recently replaced the engine in it. I have been driving it around for about 2 weeks with no issues and then one day I was at a buddys house and the truck was parked sort of at an incline with the nose facing upwards and I went to start it after probably 6 or 7 hours of sitting there and it started up like normal and then after probably 5 seconds it died. I didnt know what the issue was so I towed it home that weekend and I bled the lines and found out I have air in the system. It has been doing this ever since then. I go to start it in the morning and it dies after 5 seconds, it only does this after sitting for a long period of time like 8 hours. i know it was leaking from the injector caps so I replaced the o rings and caps on the ones that were leaking and thought I fixed the problem but I havent. I was just curious as to what else it may be, Any help is appreciated!

 

[Thewespaul]

You have air getting in that is aloeing fuel to drain back on your supply side. I would install a check valve on the rubber line by the frame/lift pump and see if you get any improvement

 

[1978FrankenFord]

Ill try that. It wouldnt be the return lines at all?

 

[1978FrankenFord]

I found a couple o rings that needed replaced so I replaced them an i also found it was leaking from the return line from the filter to the IP. Ill find out if this was it in the morning