Just to add, if fuel supply and return lines leaking, You shouldnt be able to get it mixed up, different size lines. The return line is usually a little smaller. In the picture, #6 is the fuel pressure line. #10 is the return line.
That picture came from autozone site. I couldnt find the picture I wanted in my regular database, Maybe I just overlooked it.
Monday, February 25th, 2013 AT 6:54 PM