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I have had to replace both my high pressure and return plastic fuel lines that run to the fuel pump. don't ask me how but both of them had rubbed through on the back side. Maybe due to the fact that we have been working on it in literally 0 degree temperatures we have found no way to slide the new plastic lines over the existing steel lines. We did however find a nifty little tool from baron's motors that has fixed the problem. They have a compression coupling designed to attach plast to steel. The plastic side of it has an internal sleeve so that the line will not collapse when tightening it and also they have been tested to withstand several tons of pressure without failing. cost a couple bucks a piece. I am using these because this fuel system will only be in tact for the next year or so (at which point i will be back halfing my car) so i am not going to take responsibility for the longivity of it but it does work. We put mine make together and I proceeded to beat the snot out of my car for the next 20 minutes on open country black top and came back to the shop to check it and did not have a drop of fuel escape. Dave