I ordered teflon fuel lines from Torques UK after my locally supplied teflon hoses leaked continuously. His ones have been fine for over a year running e85, never leaked once. I run twin Walbro's, twin -6 lines with a single -6 return and fuel pressures are fine.
Make sure you always match the fittings with the same brand of hose, eg. if you have Earls lines get Earls fittings.
I need to look into a fuel cooler myself if anyone has information on them.