you need to find out wether fuel is getting into the carb if its not the float could be stuck, or you could have a blockage [dirt] anywher between th tank and the float bowl. wouldnt hurt to take the carb off and give it a clean, if you haave the float bowl off and the fuel pipe on, when you let the float fall down fuel should pour out, when you push it up untill it stops then the fuel should stop. bit rough because you will get fuel everywhere but hasnt stopped me in the past, watch what your doing with all that fuel though bro especialy if you smoke lol