A few weeks ago my 2000 6.5 wouldn't start. I had the injector pump replaced with a reman from ssdiesel. also had the pmd and lift pump replaced, also replaced the lift pump relay switch. I replaced the injectors about 4000 miles before all of this. two weeks after getting the truck back from the shop it wouldn't start. Had it towed back to the shop and it started fine for them all day. So I went and picked up the truck. Started fine for 3 days then wouldn't start. Let it sit all day and it started that evening. Ran it for 10 min shut it off and then it wouldn't start. the entire fuel system is brand new, what could be causing this?