Intake system for multiple cylinder internal combustion engine

A multiple-cylinder internal combustion engine comprising at least first and second cylinder means;

• first and second passage means which are separated from each other and communicate, respectively, with the first and second cylinder means;
• throttle valve means provided in each of the first and second passage means;
• first and second light load fuel passage means branched from common fuel passage means and communicating through opening means respectively to said first and second passage means downstream of said throttle valve means;
• first communicating means immediately downstream of the opening means;
• means through which said first and second light load fuel passage means communicate with the first and second passage means for establishing communication between the first and second passage means to thereby moderate pulsations of intake gas flow;
• shut-off valve means provided in the first passage means downstream of said first communicating means, said shut-off valve means being movable between closed and open positions and closed under at least one of idling operation and deceleration of the engine to thereby interrupt the supply of intake gas flow to the first cylinder means which is associated with the first passage means in which said shut-off valve means is provided and to lead the intake gas in the first passage means to the second passage means through the first communicating means, said shut-off valve means being of a butterfly valve type which is inclined in the closed position, relative to said first passage means, to have an upstream edge portion and a downstream edge portion;
• second communicating means provided between the first communicating means and said shut-off valve means and located in the vicinity of the downstream edge portion of the shut-off valve means in the closed position for providing communication between the first and second passage means to direct liquid fuel that is collected thereon toward said second communicating means and thereby prevent accumulation of fuel at the shut-off valve means, said second communicating means having a cross-sectional area smaller than that of the first communicating means.