I bought a duster years ago that had an issues with the tank/ sending unit line. It would literally stop up, and choke the car out from running. if you blew down in the tank, or from the fuel line back with an air hose it would run again until the clog showed back up. To see if that is your problem, remove the fuel line going to the fuel pump, and put it inside a bottle or another fuel can to see if that eliminates your issue.
Matt