1969 Plymouth Satellite gas tank question

Hi all.On my 1969 Plymouth Satellite on the gas tank I have the fuel line coming out of the fuel tank, another line coming out of the tank too that runs up under the body some where and a 3rd line that is very short and if I put more that a quarter of a tank it bubbles out of that short tube, it always smells of gas too. Any ideas???Thanks in advance. Bruce.005.JPG