Fuel supply apparatus for an internal combustion engine having a membrane separating gasoline and high-octane fuel and the low octane fuel

Using different fuels octane according to A engine operating conditions. A material fuel tank (3) gasoline separation membrane (101) separating device (10) by separated into the raw fuel from the high-octane high-RON fuel and the low octane than the material fuel low-RON fuel having a in and either supplying one or both the engine the high-RON fuel or the low-RON fuel in accordance with the operating state of the engine with the fuel switching mechanism (21). Since it is possible to change the octane number of the fuel according to the engine operating condition, it is possible to achieve both the improvement of increasing the exhaust emission of the engine output by improving the combustion conditions of the engine. .FIELD 1