which is it? is it the smaller tube or the thicker one i would think it the one not going to the regulator but the one coming out the other end of the fuel rail....is it the skinnierplastic hose or is it the thicker one?thats all i needed to know.

also the plastic fuel line thats used on are cars is a ABS plastic material correct.

 

On my car the bigger one is the feed line and the smaller one the return to the tank. It has to be that way since you have more gas coming than going back.

 

do you have an aftermarket fuel setup on you car or are you using the factory fuel lines?

 

The fuel lines are nylon.

 

thats great Rob but is the return the smaller of the 2 lines or the larger...

 

The return line is definitely smaller.

 

You already had the answer, so I did not answer it again. 3/8" is the feed, 5/16" is the return.

 

And the return line is the one that connects to the fuel pressure regulator. The feed goes into the back of the passenger side rail.