E85 fuel is fuel consisting of roughly 85% ethanol and 15% petrol. The petrol is used to prevent cold start issues. Using E85 may require extra modifications to the fuel system: the fuel pump must be able to handle it, ethanol clean out the system of dirt and rust, clodding up the fuel filter. E85 also needs a very different fuel/air mix to ignite, so the injection system must be altered accordingly. Due to the limited availability of E85, it makes sense to equiped the engine with a fuel management system that copes with both E85 and petrol, so called flex fuel systems. Typically this requires after market EFI systems.
(Flex) Fuel, LPG and E85
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