I bought a new carb off ebay for my HS50 build. It doesn't seem to be getting gas to the spark plug as the plug is bone dry when I pull it. The plug has spark and will pop the engine over if I give it a shot of starter fluid. I began with backing out the carb adjustment screws one full turn from closed. There is gas in the carb bowl. I'm not sure what to try next. Any help will be greatly appreciated. Thanks!