I'm thinking this is a " gravity" fed carb from the fuel tank, if the tank is dirty and fuel not flowing, pull and clean the tank as well as the fuel lines., carb is probably contaminated still , Mark O is right on about replacing the carb if you're not experienced in tearing them down , easy to miss a stopped up jet or bad diaphram etc. If you don't clean the tank , your problems will continue going forward , also you should be able to blow through the fuel filter with out any restrictions
