[Hartdiesel]

So sunday night i thought i ran my truck out of fuel but when i had it towed it only took 27 gallons of fuel!! GM dealer in dillion montana couldn get it started hook up there scan tool and it said it was getting feed back from the idu. They checked fuses and one was blown so they replaced it. I drove the truck 900 miles back to durango co yesterday never had a problem. Then this morning i left for work got a mile down the road and the truck stopped running. I immediatly checked the fuse and it was blown. I replaced the fuse and truck still didn start checked it again and it blew again. Any ideas on what could cause this?? I need help it gonna go to the dealership in the morning.

Thanks