I will provide my solution to the "leaking lines" on a 6-pack. I resorted to using a small black O-ring that was just small enough to fit inside the Carburetor nut (it the same diameter as the flared fuel line) that the fuel line bolts to. Because the O-ring is actually sealing against the fuel line "flare" and the Carb nut, you can't tighten it real tight like you normally would or it will destroy the O-ring. I tightened it "extra snug". I did this as a "last resort" when I couldn't get my new lines to seal. It has been 2 years since this fix and I haven't had to touch them and they are not leaking.