Carburetor not getting any gas

When I had an empty fuel line up to the gas tank, which you have now, after reassembling my 65 Barracuda with a new fuel tank I found that the fuel pump could not pull the fuel up and out of the tank when it was dry. I tried 3 different fuel pumps. I don't have a vacuum pump so I got a turkey Baster and after several pulls with it I got gas down to the end of the line and closed it off. After I put a fuel pump on it pumped gas to the carburetor.