Have you tried removing the drain plug in the carb bowl to see if it really is empty?
Try that, see how much flow you have.
If no flow, disconnect the line from the carb, see if there is flow there.
If good flow to the carb, there may be a screen in the carb inlet fitting that is clogged, something blocking the needle valve, the float drop set too high.
If no flow from the line at the carb, there is a problem at the tank valve. I don't know what type tank valve you have, but it shouldn't have a blocked port. I would try to get the correct valve. A good valve will have a screen standing up inside the tank to protect the system from any future rust or anything that may get in the tank.
I doubt a check valve to let air in will work, I would be worried about it failing to seal and dripping gas on a hot engine!
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