The air box only provides enough negative air pressure to collect fumes from the crankcase venting system. Any liquids expelled into the crankcase vent system will collect in the overflow tube. It is difficult to believe that gasoline could be expelled in large quantities from the crankcase without either engine problems or reduced fuel mileage.
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Spud
"Never argue with an idiot. He will drag you down to his level, and beat you with experience."
Mark Twain
2015 Zongshen ZS250GY-3 (RX3)
2006 Zongshen ZS200GY-2 (Sierra 200)
2005 Honda XR650L
2004 Honda CRF250X
1998 Kawasaki KDX220
Mods made to my Zongshen ZS200GY-2:
http://www.chinariders.net/showthread.php?t=6894