Service manual

G420F(FE) Service Manual Chapter 5. Engine Management System (EMS) 170
MPI Gasoline System Operation
MPI (multi-point injection) system is used for
G420FE dual fuel engine and G420F gasoline/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