1972 c10 1/2 ton fuel problems

[Popp55]

I have a 1972 chevy pickup. Still running the original motor and trans. I have replaced my electric fuel pump and sending unit 2 times. My issue is the carb is not receiving fuel from the pump but I also disconnected the in line to the fuel pump and turn the truck on and still no fuel coming from the line itself. So I can't figure out why the line isn't getting fuel in the first place. I checked the fuse area that runs to the fuel pump and it has good power, even replaced the wire to be sure there were no breaks in it. Any ideas or anybody who has had this problem?
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