Ive got a plugged fuel return line on my 69 Vette that I havent used for a while . I tried compressed air @ 120lbs and using some braided wire to roto rooter it but its still plugged. The wire or air will not pass . Any products out there you guys think would unplug this thing . Seafoam or? Replacing the line would be a real PIA. I would appreciate any Ideas .