What I don't understand is all the big vulnerable hoses on so many bikes. Quick dump systems like the IMS cans have in internal vent to displace the air so as fuel goes into the tank the air goes up into the dump can. Maybe just so it's easier to see when it's full but we've never had a problem knowing when ours is full and the vent hose is partially internal to the tank so it can't spill out in a tipover and then covered by the bodywork.