NicksTrix said:lars, i've seen the light blue line used in press on fittings used inside fuel cells.
you might want to look into some of that should you don't want to hard line something.
Thanks Nick, is that the Gates or Eaton/Weatherhead stuff? Having just gone through routing aluminum line with AN fittings in my airplane's fuel tanks, I'm in love with that. Just have to support it so it can't vibrate. TZ used an airplane fuel line trick to create an all metal pickup tube in his tank. As fare as I'm concerned, anything you can do to avoid dunking fuel lines in fuel for the long term is a good thing. Just in case.