Mike, it sure does sound like a fuel pump motor problem. Our trip to Des Moines in July one of the guys ran strong for two hours before coasting to a stop along the side of I-35, and getting hauled to the hotel parking lot. Thought we fixed it with a new fuse, believing that condensation from the AC had caused the blow, only to have the same thing on the way home. Once it stopped it would not start without "resting" for 1/2 hour, then it would only run for about five minutes. Changed the in-tank pump and it seems to be OK again. With an external Holley, maybe carry a spare?