Well, long story short he has had problems with his truck and i can't figure it out. He started his truck yesterday and it idled just fine. He proceeded down the parking lot to make a turn and his truck shut off and wouldn't turn on. It cranks just fine, it just won't turn over. I originally thought it was the cam sensor and replaced it. But with no luck, the truck still won't start. He has had issues in the past with his fuel pump. I checked the resevior where the fuel filter is to see if it had any diesel in it, and it was about full. He has had problems driving up his steep driveway, to the point where it almost shuts off due to the steep incline. Any ideas?