Patent ID: 7438047

Claim:
A multi-cylinder engine comprising a cylinder head ( 1 ) to which an intake-air distribution passage ( 2 ) is attached, the intake-air distribution passage ( 2 ) distributing a fuel-air mixture to a plurality of cylinders ( 3 ) and having a single distribution passage inlet ( 4 ) to which a throttle body ( 5 ) is attached, liquid fuel being supplied to the throttle body ( 5 ), wherein the throttle body ( 5 ) has an interior area provided with a throttle intake-air passage ( 6 ), within which a throttle valve ( 7 ) is arranged, an injector ( 8 ) being attached to the throttle body ( 5 ) and having a leading end portion ( 9 ) which is positioned opposite to an interior area of the throttle intake-air passage ( 6 ) downstream of the throttle valve ( 7 ) and is opened to provide a liquid-fuel injection hole ( 10 ), an intake-air pressure sensor ( 15 ) that detects an intake-air pressure of the throttle intake-air passage ( 6 ) and an engine's rotation-number sensor ( 16 ) that detects the number of engine's rotations being associated with the injector ( 8 ) through a control means ( 17 ), the control means ( 17 ) controlling an amount of the liquid fuel to be injected from the injector ( 8 ), based on the intake-air pressure and the number of engine's rotations, the intake-air pressure sensor ( 15 ) being attached to the throttle body ( 5 ) together with the injector ( 8 ), the throttle intake-air passage ( 6 ) of the throttle body ( 5 ) having a peripheral wall in which there is provided an intake-air pressure introduction passage ( 18 ) for introducing the intake-air pressure within the throttle intake-air passage ( 6 ) to the intake-air pressure sensor ( 15 ), an inner peripheral surface of the throttle intake-air passage ( 6 ) being opened to provide an inlet ( 18 a ) of the intake-air pressure introduction passage ( 18 ) upstream of the injector ( 8 ).