CM870 won’t start when engines hot

[Bengy88]

Any check engine light? Seen everything from injectors to an oring on a davco cause this. I would probably start by making sure there isnt an issue at the davco ( assuming you have one). Check for fuel leaks, verify fuel pressure when cranking, running, and while giving the problem, check for air in fuel……. That is if you are 100% positive that it is a fuel problem.

Also are the fuel filters new as in you put them on yesterday and your trucks taking a shi#t on you today? Or new as in you changed them after the issue began? May be somewhere you wanna check.