6.2 starting.

Hi guys. I have owned many 6.2 and this is the first time I’m stuck. The other morning my truck stopped a couple times on way to work I pumped diesel filter and got to work fine. I used the truck during the day and on way home it died but got going twice more then had to get tow truck. I have replaced filter and glow plugs and I checked cut off on top of injector pump was working good. I seem to get good pressure as have electric pump and mechanical one also. I thought this would solve the problem as always before but after charging the batteries I went to start and no joy. I tried a couple times then I cranked it for a few minuets straight then fired and ran sweet only for a minute. I then used a fuel can with hose to filter( with hand pump on top ) I pumped up and did the same again. It’s my every day driver and I don’t want to drive my jappa truck tomorrow any help be great guys.