http://en.wikipedia.org/wiki/E85

E85 is usually used in engines modified to accept higher concentrations of ethanol. Such flexible-fuel engines are designed to run on any mixture of gasoline or ethanol with up to 85% ethanol by volume. The primary differences from non-FFVs is the elimination of bare magnesium, aluminum, and rubber parts in the fuel system, the use of fuel pumps capable of operating with electrically conductive (ethanol) instead of non-conducting dielectric (gasoline) fuel, specially-coated wear-resistant engine parts, fuel injection control systems having a wider range of pulse widths (for injecting approximately 30% more fuel), the selection of stainless steel fuel lines (sometimes lined with plastic), the selection of stainless steel fuel tanks in place of terne fuel tanks, and, in some cases, the use of acid-neutralizing motor oil. For vehicles with fuel-tank mounted fuel pumps, additional differences to prevent arcing, as well as flame arrestors positioned in the tank's fill pipe, are also sometimes used.

E85(体积比乙醇85%/汽油15%)通常用于改型发动机,这种发动机可以使用乙醇体积比含量85%以下的乙醇汽油.non-FFV(单一纯烧汽油的车 辆)和FFV(可以自适应烧乙醇汽油的车辆)的区别在于,FFV去除了燃油系统中能被乙醇腐蚀的纯镁,铝和橡胶部件,燃油泵能够工作在导电液体中,因为乙 醇导电,non-FFV的燃油泵只能工作在不导电的汽油中.此外,发动机部件(怀疑是气缸壁,因为酒精是很好的清洁剂,会将润滑油清洗掉,此外在一些特殊情况下,燃烧不完全会产生酸性物质)需要加特殊镀层来防止磨损,燃油喷射控制系统要求能在大范围内做变化(比 non-FFV要能多喷30%的油),不锈钢的输油管线,用不锈钢来代替镀铅锡铁板的油箱,有的时候还要采用酸中和的润滑机油.有时,对于油箱和燃油泵一体的,还需要预防电弧放电和在加油管处设置火焰捕捉器

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