for B100, a neoprene/nitrile tube of a typical fuel/hydraulic hose will die. Our newest hoses have nylon veneer liners to withstand the caustic components in bio.
http://www.gates.com/brochure.cfm?brochure=12468&location_id=5348
http://www.gates.com/brochure.cfm?brochure=12468&location_id=5348