| 摘要 |
A fuel supply system for an outboard marine engine includes a vapor separator ( 28 ) having a uni-directional vapor vent device ( 36 ) for preventing fuel leakage when the engine ( 12 ) is tipped on its side. The vapor separator ( 28 ) includes an enclosed interior chamber ( 50 ) which is filled with liquid fuel by a suction pump. A separate, high pressure pump transfers the liquid fuel from the interior chamber ( 50 ) to a fuel injection system ( 32 ) of the engine ( 12 ). The vapor vent device ( 36 ) includes a generally tubular casing having an enclosed top end permeated by an escape passage ( 84 ), and a float ( 94 ) slidably disposed within the casing ( 82 ) for movement toward and away from sealing engagement with the escape passage ( 84 ). A spring ( 98 ) urges the float ( 94 ) toward a sealed condition against the escape passage ( 84 ), but is too weak to overcome the weight of the float ( 94 ) unless the engine ( 12 ) is tipped more than about 25 degrees from vertical, or unless the level of fuel in the interior chamber ( 50 ) lifts the float ( 94 ).
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