65 dart 273, No fuel from pump to carb!

Fuel tank could be filled with enough rust and crud that the filter sock on the pickup in the tank is clogged. Try taking the fuel line from the tank off and blowing air into it (mouth or compressed air at a low setting) while an assistant takes the gas cap off and listens at the gas cap hole. When air is blown into the fuel line, the assistant will hear a gurgling noise as the air bubbles up through the 5 gallons of gas. If you do not hear the bubbling sound I would think that one of the following problems exists:
1. The filter sock on the pickup in the tank is clogged
2. The Fuel line got pinched somehow.
3. Rather unlikely, but the pickup could be frozen in place above the fuel level. In which case you would hear air hissing out but no bubbling.
4. Perhaps there in a clogged inline fuel filter somewhere between the pump and the tank.

Keep in mind that this goes along with the idea @RustyRatRod had to blow air into the Gas cap hole. The way rust particles clog things up, the blockage will be one way when testing with air. If you do both his idea and mine, I would think you could eliminate the pump to tank line as the culprit, of find a solution.