I didn"t remember that Ford still made 429"s in 1982. Does it use a mechanical, on the engine fuel pump? I have an 84 F250 with a factory carburated 460. It has an electric fuel pump for each of the two gas tanks and a setup that changes fuel flow from one tank to the other. It also has a device in the fuel line near the carb that cycles some of the fuel flow back to the tank via a return line. I assume that the device was put there to avoid vapor lock, as it is in the highest point in the fuel line. I have never had any vapor lock problems with that truck. I don"t know how such a device would work with a mechanical pump, but it sure seems to work well with the high flow electric pumps.
Something we used to do while waiting in the long Summer lines to get a turn to drag race was to open the hood to vent the underhood heat a little better. We also hand pushed our cars in the lines, but that wouldn"t be nearly as easy with a loaded grain truck!
Opening the hood would cost nothing, and it might help. Just don"t forget to close it. Rigging an electric pusher pump, a vapor separation device and a return line would probably eliminate the problem, but it might end up costing several hundred dollars.
I doubt that using premium gas will help a vapor lock problem, but trying some wouldn"t hurt. I know of no additive to prevent vapor lock. I remember guys wrapping their fuel lines with many layers of aluminum foil as a kind of heat shield, but I don"t know if it actually worked.
Vapor lock is a hassle that I don"t think most people have to worry about anymore with fuel injected vehicles. But I sure remember those hassles, and I think modern gasoline makes it even worse. Good luck!
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Today's Featured Article - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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