If the vent is to the RIGHT of the fill hole, how is the gas tank vented?
Lift up your stock cap. There are 2 small holes underneath. The one on the left is for overfill.
Look closely and you'll see that the hole on the right sits right under the "fitting" on the gas cap. The gas cap has a hole in it. Gas fumes are vented thru the gas cap, and down that tube, which goes thru the gas tank and out the bottom. Like I said before, it's afairly elaborate venting system.
If E-Bay says your race cap is vented, well then you just gotta know it's true. But I don't see it.