I know a lot of discussion has been had on this forum as far as people getting by with the stock fuel system and running E85. I wanted the opinions of those who have upgraded their lines as to what worked best. I know CPE rubber is not compatible with E85 and will deteriorate rather quickly when subjected to it. I also know that as far as hoses go, PTFE is the end all for the current market. But, FKM seems to be a viable alternative with a tighter bend radius with the ability to use standard AN fittings. Does anyone have any experience using FKM hose?

I plan to use my stock hard lines. They seem like they should hold up to the E85 without any problems. From the firewall to the rail, I am going to add a -6 AN hose with an inline filter. As for the return I'll convert it over to a E85 SAE30R9 compatible hose with the sensor tapped in.

 

I have been using all OEM lines and have had no problems so far