I have a 1990 Sportster that I just got recently, I had to rebuild the engine on it (had a mechanic do it) I've got the bike now and I'm having an intermitent fuel leak problem coming out of the overflow on the carb. I have had two people look at it they say the carb is fine they will clean it and then a few days later the bike will start leaking again. This is only during start up and shut down most of the time. By leaking I mean tons of fuel coming out. Another thing I have noticed is that it seems that sometimes the fuel take hisses when I pull the cap off. When we rebuilt the engine the mechanic removed all the smog stuff and plugged the required hoses. Does anyone have any ideas? thanks.