couple of photos, taken today, both sets of fuel line from Wolfgang.
the carbon fiber and gold 79 1200, the fuel line has been on the bike with fuel in it for about two years. The fuel has ethanol in it, somewhere between 5 and 10 per cent. Whatever this fuel line is, it is still bright blue two years on, and is still flexible, with no signs of turning colour. The actual colour is fairly bright blue, and is not technically "correct" as to original new Cavis Benz colour, but I would rather not go up in flames.
the silver 82 1200, the fuel line has been on the bike for slightly less than a year with fuel in it, same fuel as the other bike, the fuel line is starting to turn a bit greenish, and has started to harden. Will likely replace it again some time this summer, even semi hard fuel line scares me silly, I have an extreme aversion to any risk of fire no matter how small...
I have no idea what either fuel line is, or what the differences are technically, but if I can get any more of the same bright blue line from Wolfgang I am going to try again to buy a significant length of it to have around. Wolfgang is interesting to deal with, I suspect this stuff may be somewhat hard to get, he sort of rations it out, happy to sell it a meter at a time, but not keen to sell me major length of the stuff last time I asked........
thinking about trying to emulate original fuel line, to be most authentic, maybe I should be looking for brownish greenish fuel line, to duplicate what Cavis Benz fuel line looks like after a year or so on the bike, before it shrivels, becomes totally brittle, then goes dark brown and breaks at the fuel tap or carb fittings............... :

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Paul LeClair