Quote:
Originally Posted by CincyJohn
Thanks for the help/information. Not sure I understand the person who suggested the e10 occasional clean out vis-a-vis the fuel pump. Either the e85 is going to cause the fuel pump to go or it isn't, right? How would running an occasional tank of e10 "clean it out" and prevent that? It doesn't make any sense to me.
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like i said, this is all anecdotal evidence. your car isn't rated for more than e10, so if you have issues with e85, you're kind of ow your own.
some wrx owners who are tuned on e85 will have issues with their high pressure fuel pump. tuners suggest staying below e60. the theory is that e85 has less lubrication than e10, therefore, it seizes up. emptying the e85 with e10 usually fixes the issue. is it just the fuel or are there external variables causing the fuel pump failure? who knows.
keep in mind there are diminishing returns once you're above a certain ethanol level. for example, the wrx gains the most at e30. after that, there are diminishing returns. so there's no point in running straight e85 other than not having to mix, which the flex fuel solves that issue for you.