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The fuel adhesion to the surfaces of the intake port, cylinder wall and piston head is one of the common phenomena in turbocharged gasoline injection engine. It causes super-knock, unburned HC and oil dilution. In this study, the fuel thickness and amount of adhering fuel to the oil film on the flat plate are measured by laser induced fluorescence (LIF) method and high-speed camera. As a result, they can be evaluated quantitatively. An influence of the oil film on evaporation of the fuel is also clarified.