Patent ID: 6637415
Filing Date: 2003-10-28
Classification: F02M

Abstract:
An evaporative fuel leakage preventing device for an internal combustion engine, comprising:an intake passage that introduces air from outside the internal combustion engine into a cylinder of the internal combustion engine; an adsorbent that is disposed in the intake passage and that adsorbs evaporative fuel generated in the intake passage during stoppage of the engine; a return portion, located lower than a lowermost portion of the adsorbent, formed in the intake passage at a location between the adsorbent and a main body of the internal combustion engine; and an evaporative fuel return passage communicating between the intake passage close to the lowermost portion of the adsorbent and the return portion of the intake passage, wherein: an atmospheric suction inlet of the intake passage is formed on a side of the adsorbent opposite to a direction in which evaporative fuel generated in the intake passage moves due to application of a gravitational force; and the adsorbent is desorbed of evaporative fuel adsorbed by the adsorbent due to intake air in the internal combustion engine during operation of the internal combustion engine, so that the evaporative fuel is sucked into a cylinder of the internal combustion engine.