G424F(FE) Service Manual Chapter 5. Engine Management System (EMS) 141
MPI Gasoline System Operation
MPI (multi-point injection) system is used for
G424FE dual fuel engine. An electric fuel pump in
gasoline fuel tank supplies the fuel and generates
the injection pressure. The gasoline fuel pressure
regulator is a one-way, non-return configuration. All
gasoline specific components are automotive
production parts and validated to strict automotive
standards. Four (4) sequential injection channels are
supported. Injector as an electronic controlled fuel
injection unit, is solenoid valve which supplies
exactly calculated fuel as a spray to engine to
best combustion under the condition of various
engine load and speed.
For fuel consumption reduction, engine performance
enhancement and emission reduction, ECM controls
fuel injection to satisfy air fuel ratio required by
system by reflecting induced airflow and air fuel ratio
among emission and adjusting injector operating
time. To enhance these control characteristics, quick
response of injector is required, and spray feature of
injector is important for perfect combustion.
Use of unleaded gasoline of 87 octane or higher is recommended for optimal performance of the MI-07
system.
A gasoline fuel system includes the following components:
Gasoline fuel pump
Fuel filter
Pressure regulator
Fuel rail
Fuel injectors
Small engine control module (SECM) and related sensors and equipment
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