I toped of the tank in my 69 and notice that it was leeking fairly good I took it home an found a small niple that looks like a hose would hook up with. It is not the feul line. What is it for and what sould I do?

Zounds like a vint tube bacque to the feul tank. Chek the tank for a seecond line that someone may have pluged of insted of bying a new hoze.

Dale