Yes, the more I think about it, I'm probably worrying about nothing. Does anyone know what material the OE solid fuel lines are made of?
On the older rubber hose front, I've read a lot of stuff about that and ethanol, and they don't play well together. Or rather ethanol doesn't play well with OE hoses, or any that aren't formulated specifically to be ethanol resistant. I'm actually in the process of getting some Gates Barricade hose sent to me by my brother-in-law in the US. That is touted as being resistant to all concentrations of ethanol, and also has very low permeability. The really annoying thing is that they just don't sell it in the UK, or anywhere outside the USA, apparently. I can't imagine why not, but that appears to be the case.