I wonder if mine might be like that. I haven't really had a chance to get underneath the car and trace the line back all the way to the gas tank but as of now the charcoal canister is removed and the metal line is basically just sitting there unhooked and has been like that for some time. I haven't had any issues of gas pouring out. Ever since I did get my gas gauge working last summer I've noticed I've been getting terrible mileage (now that I can actually see how fast the gauge moves to E).
Wasn't sure if it was the new sending unit or if it had to do with that vent line which is what triggered this question.