My 04 f350 with the 6.0 engine won't start when hot and will shut down after running about 5 miles. It doesn't have good power when it is running. The fuel fliter cap did develop a crack but that has been replaced with a new one. The check engine light goes off as soon as it starts. Any suggestions? Oscar

Read this link, particularly Item 6:

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

Sounds like a tired, heat-soaked fuel pump.