Fuel injection system

An engine comprising a fuel injection system including multiple intake passages delivering fuel/air charges to multiple variable volume chambers, said intake passages being arranged such that each intake passage communicates with a corresponding variable volume chamber through a valve, at least one charge former communicating with each intake passage, a plenum communicating with each intake passage, a balance passage interconnecting the multiple intake passages, and means for delivering fuel through the balance passage to enhance the consistency, from one chamber to the next, of fuel/air ratio in the charges delivered to the chambers.

An engine comprising an induction system including a plurality of intake passages, a plurality of fuel injectors, at least one of the fuel injectors communicating with a corresponding intake passage at an injection point within the corresponding intake passage, and a balance passage interconnecting together the plurality of intake passages, the balance passage communicating with each intake passage of said plurality of intake passages at the corresponding injection point within the intake passage, and a fuel supply system communicating with said fuel injectors, said fuel supply system comprising a pressure regulator which communicates with at least one of said intake passages at the corresponding injection point and a vapor separator having a vapor discharge port, the vapor discharge port communicating with the balance passage to deliver fuel vapor to each intake passage.

An engine comprising an induction system including a plurality of intake passages each communicating with a corresponding variable volume chamber of said engine through a check valve, at least one fuel injector which communicates at an injection point with at least a first intake passage of said plurality of intake passages, and a balance passage interconnecting together the plurality of intake passages, the balance passage communicating with each intake passage of said plurality of intake passages upstream of the corresponding check valve, and a fuel supply system communicating with said fuel injectors, said fuel supply system including a pressure regulator which communicates with at least one of said intake passages at the corresponding injection point.

An engine comprising an induction system including a plurality of intake passages, a plurality of fuel injectors, at least one of the fuel injectors communicating with a corresponding intake passage at an injection point within the corresponding intake passage, a balance passage interconnecting together the plurality of intake passages, the balance passage communicating with each intake passage of said plurality of intake passages at the corresponding injection point within the intake passage, and a manifold in which said intake passages are formed, said manifold also defining said balance passage and supporting said fuel injectors, and a fuel supply system communicating with said fuel injectors, said fuel supply system comprising a pressure regulator which communicates with at least one of said intake passages at a corresponding injection point.

An engine comprising an induction system including a plurality of intake passages, at least one fuel injector which communicates at an injection point with at least a first intake passage of said plurality of intake passages, and a balance passage interconnecting together the plurality of intake passages, a plenum chamber communicating with each intake passage of said plurality of intake passages, the plenum chamber having a drain outlet that communicates with said balance passage, and a fuel supply system communicating with said fuel injectors, said fuel supply system including a pressure regulator which communicates with at least one of said intake passages at the corresponding injection point.