Fuel tank vent

[ERIK D]

Need a little help with the fuel system on the bullet.as u guys know the bullet is 99% done, and when i am not driving it ,it sleeps in the garage,but every time i need to get to the garage,there are alot of gas fumes in there.i have already checked all the fuel lines and there is not one drop comming out,also the carb is dry on the outside,when its running it idles just fine and the throttle response is great,so i dont think is the carb.maybe someone can second me on this,i've been thinking that it could be the fuel tank vent,i did put one in.it is a steel braided line with a filter on the end.maybe there's another type i should use.
You all's help w/ this problem will be greately appreciated.