In March of 2003, Mike, my 1990 Winebago Elandan on a Ford chassis with a 460 engine bolstered by a Banks installation ran just fine up that long slow climb on I-10 from Blythe to the rest stop just beyond General Patton's museum.
We stopped for lunch and 45 minutes later it started and idled very reluctantly, and when I put it into gear and tried to move off the engine stuttered to a complete stop. Two hours later, the symptoms were much reduced but by then a Coach Net techie suggested I spend the (Sunday) night in the rest stop and try it the following morning. If it wouldn't run, he'd arrange to have it towed to a Ford dealership in Indio (or wherever nearest); else, let him know during out continuing trip to Hemet and he'd arrange for service at Gosch Ford.
Well, next morning it started just fine and ran like a Timex all the way to Hemet. On the Coach Net techie's advice I had Gosch test it for fuel presure and fuel flow, and the pump failed both tests miserably. I said, good heavens, it's only got about 50K miles on it, to which the Gosch service advisor said, I see them in here needing a fuel pump replacement at 25K miles. The problem according to the advisor is that the pump overheats as the fuel level gets down to a third or below. And even though they were replacing my fuel pump with a superior Ford pump, his advice was to fill up every time the tank got to half-full and that is what I have since done consistently. Now, with an additional 12K miles on the rig I've had no problem.