Heavy gas smell

Hi Guys,

Quick question.... I am getting a real bad gas smell after filling the tank and driving. I even had one time where I filled up the tank and pulled around (to the left) to air up a tire and there was gas running down from somewhere on the right rear quarter. It is a 1967 Barracuda.

I assume I have something going on with the vent line for the gas tank. I looked under the car, but didn't see anything. I'm thinking I might be missing a portion of the vent line so gas can escape when it is full.

Can someone tell me where the vent line is supposed to be on a '67 Barracuda. I could pull the tank down and look, but just filled it. I will run it down so I can drop the tank easier to fix, but would like to know what I should be looking for.

Thanks!