The present invention using the display device formed of the belt-like of the honyu incident to fuel a display apparatus according to the prevention and honyu preventing automobile fuel inlet for preventing, a band-formed part and yujong to allow fixing by installing the fuel inlet peripheral literally It consists of a plate-like part to allow representation and, and in that characterized in that the representation in intaglio or relief the title characters in the plate-shaped part to contamination by opening and oiling of continuous oiling cap to be distinguished yujong notation character, of the fuel It characterized in that to apply the same color as the color of the lubricator according to the type. In addition, even if the outer diameter of the fuel inlet somewhat different of a flexible rubber material and the synthetic resin to enable the installation and fixed to fixing means for fixing to the outer diameter of the fuel inlet: Even after refueling cap through and the fixing means is removed or removed to allow yujong identification and , and it can be easily installed on the fuel inlet of the common vehicles using the diesel and gasoline produced in imported cars and domestic tour just before as well as after removing the fueling cap or disconnect and I the present invention is fixed to the fuel inlet during refueling of colors and yujong Boating accidents due to lack of knowledge or experience, letters indicated for the vehicle by making sure easy and intuitive self-identification and the yujong due to negligence on the refueling process, such as a vehicle fuel injected during the chaos yujong can be prevented.