Heavy gas smell

So I finally got a chance to look at my car to see if there was a vent tube next to the filler tube on my car and there is. Vent line comes up the filler tube, goes around a loop and dumps back into the filler tube.

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I don't see how this allows the tank to vent, nor does it explain why I am losing gas somewhere when the tank is full. As I said before, I had one occasion when I filled the tank and pulled around to the left to air up a tire and gas ran out of the right rear side. It was actually dripping off the point of the quarter and wheel well opening at the back of the tire. There HAS to be another vent or something not connected properly somewhere for it to do that.

The tank is pretty full, so once I have a chance to run it down near empty, I will put the car on the lift and lower the tank on my transmission jack until I can see up and around it. Who knows,.... maybe where the vent line connects to the tank has a bad section of hose and the gas is getting out onto the flange of the tank and ran off when I rounded around to air up the tire. Seemed like a LOT of gas to do that though without running off anywhere else. It was a pretty good amount that ran out.

And like I said before,... the weird part is it only does it immediately after filling when the tank is completely full. No other signs of leaks or smell after that.