2000 chevy c3500 dump truck 6.5L
 

I have a 2000 chevy c3500 dump truck the truck has 38,000 just started having problems it would only run for 10 mins then shut off. I put a new pcm and relocated it and put a new lift pump and fuel filter. It now will run for 20 to 30 mins then start to studder but it won't shut off.
It also have a new front tank and sending unit.
Any help would be appreciated thank you.