I think the permeation rating is about pollution, and protecting the environment. I’ts hard for me to emagine how that much fuel vapor could bleed through a fuel hose.. but if every fuel line in the world is leaking vapors, it all adds up.
With regards to your Crestliner, I would suggest using Shields fuel supply hose, the same stuff used in I/O or Stern drive/inboard applications. Run it up to a barb that mounts say, through the splash well of the boat. On the other end is another barb to hook a standard fuel line to. many bass boats are set up this way. That stuff lasts forever, and has all the appropriate coast guard specs for enclosed areas. if you have an O’reilly store in your area, they should have it.
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