| 摘要 |
A throttle body 12 is connected to a rear portion of a cylinder head 10 of an air-cooled engine 5, and a fuel pump 23 is disposed in front of the engine 5. The fuel pump 23 is such as to be disposed below a fuel tank 6 in such a manner as to be separated therefrom and to be integrated with an auxiliary tank. Fuel is sent under pressure from the fuel pump 23 to the throttle body 12 via a fuel feed tube 13, and surplus fuel is returned to the integrated auxiliary tank, consequently, no piping for return fuel being required. Vapor generated in the fuel pump 23 returns to a space above a fuel level resulting when the fuel tank 6 is filled up via an exclusive return tube 25 and is, therefore, prevented from mixing into fuel.
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