my bike started leaking fuel today. i started to work today and about 3 miles down the road it stated spitting and sputtering like i was out of fuel. i switched it to reserve and it was fine. couple miles later i stopped at a stop sign and it stalled and wouldn't restart. then i stated smelling fuel. i noticed it was leaking from the vent tube between the carbs and the air box vent. no matter which position i put the frame petcock in it leaked. in the on and reserve positions it dripped and in the prime position it was a constant run. could it be a stuck float or something. i'm not to familliar with carbs. most of my experience is with fuel injected cars. any help would be appriciated.