just a copy & paste from earls plumbling ...
Installation Notes
Fuel manufacturers may have added any number of new unpublished additives to their blends. It is therefore difficult to know how the tube compound used in the inner liner of our Perform–O–Flex or any other brand of elastomeric hose will react with a specific fuel. Because of the unknowns described above, we are unable to guarantee that the hose listed is the best possible product to use with any specific fuel. If in doubt use teflon lined hose. Not to be used with brake fluid.


i,m not bashing them... i still think they make the best performance plumbling products out there ...I give them props for posting this info just wish they would have found out sooner