"Just trying to figure out a problem."

Has the car ever run and this is a new problem?

Is the problem no fuel flow to the carburetor, starts but dies shortly?

Said it has a threaded gas cap, do you see a tank vent? The tank will need a vent on the tank or in the cap for the fuel to flow. Without a vent a vacuum is created and fuel flow will stop.

To check this remove the gas cap and see if it solves your problem. The next step would be to remove the line from the fuel pump tank feed, the fuel should flow out, gravity fed from the tank.

Some quick checks using the information given and my crystal ball.