I'd really like to know an answer to this too. I have never had a car with anything but a vapor return line (which is always easy to remove). My 73 had (pas tense) a vapor return line, but it still has the clear fuel return line. I HATE THE IDEA of having this return line in my passenger compartment! Can I remove it? If so, do I have to splice the old fuel return line back into the fuel delivery line, plug it, what?