Thank you for your very-kind words! It means a lot to know it's noticed.
PVF is a great weatherproofing coating for steel lines, but is susceptible to some solvents. Though it's kind of unlikely that those chemicals will ever find their way to the inside of your fuel tank, we are never really sure what goes into de-icers and lubricity additives, so I'd tread lightly. Why not simply sand it off with medium-grit sandpaper and/or steel wool, and be done with it. It's only about four inches long on the pickup side. I have never seen a real need to have a long extended return line, anyway. And, raw steel won't get very rusty submerged in fuel oil.
-Marv-