Just as I was about to leave for the Shenandoah 500, I noticed a lot of liquid suddenly start coming out from the carbs and air filters. Not just a dripple, a steady stream of gasoline coming out the carb vent hose. It's never done anything like this before, I have no idea why it just started. The bike has sat for a couple weeks while I got new front brakes for it. Last time I rode it, everything worked great. Actually, everything still is great with the bike: starts easily, runs strong, etc. I just wouldn't get more than a few miles per tank at the rate it's leaking. I pulled the carbs off and checked the floats. Nothing seems to be sticking, everything looks clean and smooth. I adjusted the floats a tiny bit. I stuck the gas line in my mouth and blew into it. Plenty of flow with the carbs upright, but almost a perfect seal when I turned them upside down (as if the fuel level had raised the floats.) I had to blow a lot harder, but a little air would go to the bowls that way. Closed up the carbs again, checked that the situation was the same with the bowls closed, and same thing (though now the air flowed through the vent hose, obviously.) Gasoline still pours out. Repeated everything again, raised the floats a tiny bit more. No change at all. I really don't feel like I should have to adjust the floats at all, since it's never been a problem before, and they seem to be working correctly. I have no idea what else to do, though. Help? I was supposed to leave hours ago. It's a Ninja500 Parallel twin. I rejetted it several years ago when I changed the airbox to pod filters. Haven't had the carbs open since then. Never had any problems. I rode it about 200 miles a few weeks ago, and had no issues. Help?