The present invention relates to an installation structure of a fuel tank hatch installed on a bottom plate of a bus. The fuel tank hatch 200 is formed to have a size larger than that of the hatch mounting hole 110 and has a plurality of fasteners And an engaging end 220 protruding from the bottom surface of the cover plate 210 so as to be engaged with the inner side surface along a circumference of the hatch mounting hole 110 with a predetermined gap therebetween, A fuel tank hatch 200 having a reinforcing rib 230 formed integrally with a synthetic resin so as to protrude downward from an inner surface of the engaging end 220; The fuel tank hatch 200 is seated on the hatch mounting hole 110 such that the hatch 200 is inserted into the inner frame 120 coupled with the inner surface of the hatch mounting hole 110 with a predetermined gap A fastening hole 212 formed in the cover plate 210, The inner frame 120 and the inner bottom plate 100 around the outer periphery of the hatch mounting hole 110 are fastened together with the plurality of screws 300 through the plurality of screws 300, The weight of the fuel tank hatch 200 is reduced to open the fuel tank hatch 200 and the fuel tank is inspected or removed. It is a useful invention that can improve the workability of maintenance work.
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