Power unit
2-6
Direct fuel injection
The direct injection pumps “1” further increase the pressure of the fuel from the fuel tank, low-pressure
fuel pump, and vapor separator. The fuel pressure sensors (fuel rails) “2” are used to detect the fuel
pressure in the fuel rails, and the injector drivers operate the direct injection pumps and fuel injectors
based on information from the ECM to inject the optimum amount of fuel at the optimum timing.
Because the intake air can be cooled, the output is increased due to the improved charging efficiency.
In addition, the compression ratio can be increased because knocking is reduced, which increases
the thermal efficiency and fuel economy.
Because the fuel injectors are located in the center of the combustion chambers, the size of the overall
system is compact, and the overall width of the outboard motor and the distance between outboard
motors for multiple engine applications is approximately the same as for previous models.
A. Fuel flow
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