Well, it was the lift pump going out. It did it to me once again on my way to California with a trailer and then was OK. Delivered the trailer and got about 50 miles from home and it went out all the way. Had it towed to a Chevy dealer and I jury rigged my transfer pump that transfers fuel from my aux tank to the main tank so that it would pump from the aux tank directly into the fuel line. The mechanic cut the main delivery steel fuel line about half way in the middle of the frame, we connected the output from the transfer pump to the fuel line and it worked. The only problem was that the fuel return was still pumping the excess fuel into the main tank. I ended having a full main tank. The good thing is that I had installed an overflow line from the main tank filler tube back to the aux tank. Now to put on a good lift pump in the line that we cut. Thanks for the help. By the way, I'm getting rid of the truck and getting out of the RV hauling business. I have 218000 miles on it.