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Join Date: Nov 2007
Location: Chandler, Arizona
If it is a real Vulcan 750 tank, and does not have that tube, you would have to have the vented gas cap that goes with it. If it has one tube, then it is a 49 state model, and that tube is the vent. It is not just a simple vent though. The vent is still in the cap, and you will notice a little projection on the cap near the back that fits into a rubber grommet when the cap is closed. That is the passageway to the vent tube sticking out of the rear of the tank. If it is a CA model it will have 2 tubes, one is the vent, the other is for the evap emissions system, which should be removed. I have a CA model, and al the emissions crap has been removed. I installed short hoses on both the fittings at the rear of the tank, and left the ends open. I'm actually glad I have a CA tank, because I have an extra vent now, in case that little rubber grommet under the gas cap swells up due to ethanol gas and no air can get through it. That second tube terminates directly inside the tank near the filler, and there are no rubber parts to it.
I am a motorcyclist, NOT a biker.
1997 Vulcan 750, purchased about a week ago
2006 Sportster 1200 Low
2013 Royal Enfield Bullet 500, converted to carb
2001 Yamaha XT225, heavily modified
2004 Honda Rebel 250
1979 Vespa P200E
2002 Vulcan 750 parts bike
1994 Yamaha XT225 parts bike