Saddle-riding type vehicle

A vehicle fuel tank assembly 30 is provided with a fuel tank 31 and a fuel pump unit 35. The fuel tank 31 is mounted on a saddle-riding type vehicle in an inclined attitude in the front-to-rear direction of the vehicle. The fuel tank 31 has a flat shape elongated in the front-to-rear direction. The fuel pump unit 35 includes a main body 37, a support body 38 extending from the upper part of the main body 37 in the longitudinal direction of the fuel tank 31, and a fuel level gauge 39 supported and extending on the support body 38. The fuel level gauge 39 includes a fuel level gauge body 40, a float arm 41 pivotally supported at 41a by the gauge body 40 for up and down swinging movement, and a float 42 on the free end 41b of the float arm 41. The float arm 41 extends in the longitudinal direction of the fuel tank 31 and takes a highest swing position in an intermediate level of the height of the fuel tank 31. The fuel tank assembly 30 enables fuel level detection in a wide range.