So…
Boiling water and a cold end that you’ve trimmed the old nylon off the barbs works. It’s not the ideal, but it works.
New line and ends with the Dorman tool is probably the best way to go other than going full bore to -6AN PTFE braided line, which is more expensive. I went to the AN stuff just because it can be used for a lot of things. Not just fuel.
Now, that all said, my 92 Ranger someone replaced the pressure line from the pump to the filter in rubber line. But not the high pressure fuel injection line, it was just regular rubber fuel line and it pinholed badly. I needed to fix it quick and cheap. I bent up a bit of aluminum tubing I have (I keep coils of ni-copper brake line in 3/16 and 1/4, then aluminum in 3/8, 1/2, and 5/8 on hand). Bubbled the ends a little, and clamped some fuel injection line on the ends. The 3/8” was a little big, but I was able to work it past the ribs on the pump and the filter and get a clamp on each side of the rib. Bit on the Redneck side, but the lower pressure run on the older trucks it worked just fine.