I have a 1995 f-350 7.3 with only 39K on it. It cranks over yet does not fire/start. Took to dealership and of course it started. Ran all checks and no codes. Replace the Cam sensor. Brought the truck home and guess what, it starts for about a week then you go to sgtart it and it will turn over but won't start. It doesn't matter what level it's on. Some days it will and others it won't. It doesn't even blow out smoke. It seems that something is cutting off the fuel flow... lost in North Carolina!

See if this link offers any ideas:

https://www.askmehelpdesk.com/cars-t...ml#post1415281

Be sure you have recently replaced both fuel filters.