Pull the fuel line off the carb and off the muffler, blow into the line that was on the muffler and fuel should come out off the carb feed line. If nothing comes through it must be the filter on the pickup line in the tank that is restricted. If fuel comes out of the carb end of the line, the blockage must be in the carb. Make sure your air filter isn't plugged. No air in, no air out. Check both. " M "