Fuel supply apparatus for engines

A fuel supply apparatus 12 includes a throttle body 26 including an air-intake passage 24a and a throttle valve 25 and fuel supplying devices; a fuel pump 61, a fuel filter 62, a pressure regulator 63, and an electric control unit 64. Those fuel supplying devices 61-64 are provided in unitary relation with respect to the throttle body 26. The apparatus 12 also includes a body case 27 which is integrally formed with the throttle body 26 and accommodates the fuel supplying devices 61-64. The body case 27 is formed with openings 38, 40, 58 for allowing insertion/removal of the devices 61-64 in/from the case 27, recesses 65-67 for allowing the devices 61-64 to be fitted therein, and covers 39, 41, 37 for closing the openings 38, 40, 58.