Here's some fuel line for just over half a buck a foot. It won't get hard or brittle with either gasoline or "Gas/Glow". It is flexible, but not quite flexible enough for the clunk line inside the tank. For that I use high quality rubber line like original equipment. It's hard to find sometimes....

Two links:

http://www.rotaxparts.net/Scripts/pr...?idproduct=566

http://www.rotaxparts.net/Scripts/pr...?idproduct=563

I also use the hardware store plastic tubing on smoke systems and fuel system lines that don't need to stay flexible. It will harden over time, but I've never seen it get hard enough to break. It's not a bad idea to replace the lines from time to time anyway. The line I've listed above is very good however, and will last a long, long time.

AV8TOR