| 摘要 |
PROBLEM TO BE SOLVED: To prevent pressure level in the fuel tank from being at an undesirable level at minimum cost by connecting, to a return passage tube of the starting aid, a pressure compensation valve for the fuel tank that communicates with the intake conduit. SOLUTION: A pressure compensation valve 25 formed by combination of a mushroom valve 25a and a duck bill valve 25b is disposed for deaerating or ventilating a fuel tank 16. This pressure compensation valve 25 is connected to a return passage 24 of a starting auxiliary unit 21 and to an intake conduit 13. Under the continuously operating state, the pressure in the fuel tank 16 is decreased by consumption of oil. Then negative pressure opens the end portion at the return passage 24 side of the duck bill valve 25b, supplying the air, sometimes together with the fuel, to a clean air side 24 or the intake conduit 13 through a deaerating tube 26. Accordingly, the tank is ventilated without the necessity of an additional connecting portion in the fuel tank 16.
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