well i have 2 friends of mine that are pro tuners for eclipses mind me they are for 4g63 but same fuel line and tank setup, they say all that needs to be upgraded is fuel pump, filter and injectors, and prob a fpr, but i did all that exept the fpr, they say our fuel lines and tank withstand the corrosion so it works, and shouldnt have an issue, they have been running e85 on there 700hp eclipseand 1200 hp 1st gen eclipse for bout 2 years with no problem.