New line. Fortunately it sounds like it's behind the fuel filter so it will be a short piece. 2 choices: braided steel with a fitting to fit the fuel filter or call one of the TR used parts vendors and see if they have that section of line for sale. When reinstalling, be sure and slide a piece of heater hose over the rub spot, zip tied in place, so it doesn't happen again.
You can find gas filter fuel line repair kits at most chain parts stores. They are 15" long with the correct end for the fuel filter and a compression fitting. If the leak is close enough I would suggest to use one of these.