Mercury Cougar Gas Leak

I have a 1991 Mercury Cougar Coupe with the 3.8 V6 and underneath the passenger side of the car are three metal fuel lines one of which connects to the fuel filter (I assume?) Through about 10 inches of rubber tubing with a clip at the end. My problem is that the fuel line is torn and so far I've bought three of nearly the same part trying to get it to work but on two of them the rubber tubing was too big while the clip size was right but on the other the clip was too big and the tubing looked right. I do not know which part I am looking for so I guess my question is which one of the quick connect lines is it?