I have one fuel tank line that seeps a little fuel at the point where the fuel tank line (copper/brass?) attaches to the plastic header tank fuel line. I've tried multiple clamping techniques but in time the seep always wins. Question: Should I try (1) swaging the fuel tank line to expand it; (2) add a ferrul to the fuel tank line with clamps on both sides; or (3) some other technique that somebody smart about these things already knows will work?