could be sucking air. if the fuel pump is in the engine compartment. it might be that there is nothing wrong with the factory pump and it has a hole in the fuel line between it and the tank. if using a n aftermarket fuel pump it is best to put it back close to the tank. any carburated car was designed to be run on fuel that is not as volitile as modern fuel and there fore is easily vapor locked. if it is vapor lock the pump in back will solve the problem by filling up the carb bowl.

tom w

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.