I happened to surf by, so I'll answer, but i am always wrong when diagnosing engines. My guess is the carb is crudded up and the float is stuck. Did you pop open the carb and clean the float and valve with carb cleaner? It won't take long and it's easy.
unbroke


Can U believe it? My wife says: "I want an old pickup truck" so I HAD to buy it!!
'50 Chevy 3100 5 window.