I think what he is talking about is the carb is drying out over a weeks time. The Quadrajets used to leak the fuel out of the plugs under the main body. Epoxy was a good cure for them. Take the carburater off the truck while its still fule of fuel. Let it set on a bench for the same amount of time it did on the truck and check it for leaks. Could be just a simple plug leaking or it could be just evaporation. The electric primer pump will help it start, but thats not the main problem. The fuel doesn't run back out the carburaters due to the location of the needle and seat. The fuel line my run dry, but the carb should stay full and it should start right up.
Joe
