More than likely you’ll have to replace the fitting and re-flare the line. The flare gets work hardened after taking it off and on over the years and no longer seals. You should have enough line to cut off just the end to remake a new flare. If not, you can replace the line with a pre made-up one from the vendors or just make up a new one. I used CuNi (copper/nickel) with a cheap HF bender and it came out great.
Phil Moderator, The Engine Shop, Interiors and Project Journals
1952 Chevrolet 3100, Three on the Tree, 4:11 torque tube Updated to: ‘59 235 w/hydraulic lifters, 12v w/alternator, HEI, PCV and Power front Disc Brakes Project Journals Stovebolt Gallery Forum