Remove the fuel line from carb and turn fuel valve on. If fuel flows the valve is good. If slow than pull and check the screen filter on the valve. If you have the vacuum operated valve same thing, pull fuel line off carb fuel should not flow except for what is in the line. Turn over engine and fuel should pump out in relation to engine. Also remove your fuel cal and look for any distortion to the inside of cap, if it looks melted replace the cap. If cap looks good shake and listen for check ball to rattle. If no distortion and heat the rattle cap is good. If the cap does not vent the fuel will not flow from tank. Ethanol fuel will melt many of the older caps.
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