Cecil,
Appreciate the thoughts and the starting point, but it still won't start after sitting a while.
The truck never got fully warmed up, so I don't believe it would have gotten too hot. It is still getting fuel, so I don't think it would be a fuel pump.
The loss of fuel usually would have been a sputtering stall rather than an immediate stop, wouldn't it?
My first thought was gas related. Even ran to town and bought 5 gallons. Didn't make any difference, and doesn't seem to be firing. Again, I really haven't had an opportunity to see if I've got fire.