Another easy repair would be cutting the steel line back where you have a straight run and use a compression fitting and a new piece of steel line. You can get a new piece of line at just about any automotive supply store. Just hold on to your old fitting that screwed into the filter. You will just need to have the end of the new line formed to the type of seal it uses. _ie (Single or double flare, flat faced o-ring etc.) Any mechanic worth their salt should be able to do this for you.

This would be the best repair next to a complete replacement of the entire section of fuel line.