Fuel Pump (Gasoline Line) [Wg972-Gl, Wg972-G]; Electronic Throttle Body (Etb); Injectors And Fuel Injection Rail (Gasoline Line) [Wg972-Gl, Wg972-G] - wsm wg972-e4 Workshop Manual

WG972-E4, WSM

[3] FUEL PUMP (GASOLINE LINE) [WG972-GL, WG972-G]

[4] ELECTRONIC THROTTLE BODY (ETB)

[5] INJECTORS AND FUEL INJECTION RAIL (GASOLINE LINE)
[WG972-GL, WG972-G]
The gasoline system will use an external electric
gasoline fuel pump.
The pump will be mounted in the chassis of the
vehicle, or equipment near the fuel tank.
Gasoline rated fuel hose and securing devices
supplied by the OEM, will be used to transfer the
pumped fuel to the fuel rail.
The OEM may have installed a fuel filtration device
ahead of the electric pump, which may be located in the
tank or an external filter.
Most industrial equipment will be exposed to dusty
and dirty environments, therefore use caution when
opening the gasoline tank, to prevent dirt and debris from
falling in the tank.
For the filter
MAINTENANCE CHECK LIST".
The electric gasoline fuel pump, used on USA
emission certified engines are a critical part of the
certified emissions system, and do not require any
periodic adjustment.
A: Fuel OUT
B: Fuel In
The ETB is connected to the intake manifold of the
engine. The ETB uses an electric motor connected to the
throttle shaft. In addition, an accelerator position sensor
(a foot pedal position sensor) is located in the operator's
compartment. When the engine is operating, electrical
signals are sent from the accelerator position sensor (the
foot pedal position sensor) to the Engine Control Unit
(ECU) when the operator depresses or releases the
accelerator. The ECU then sends an electrical signal to
the motor on the ETB to increase or decrease the angle
of the throttle blade, thus increasing or decreasing the air
flow to the engine.
The gasoline fuel delivery system, uses a fuel
injection rail (1) mounted with injectors (2), for each
cylinder. The Engine Control Unit (ECU) will use the
gasoline fuel delivery calibrations, to pulse width
modulate each injector (2), to deliver the correct amount
of gasoline, for optimized performance and emission
control. The injector pulsing or "firing" is accomplished
by supplying a 12 volt supply, to the positive side of the
injector coil, and switching the ground circuit side, using
the injector drivers, internal to the ECU. Injectors (2) are
an emissions control device, and do not require periodic
adjustment.
(1) Fuel Injection Rail
1-M15
ENGINE
maintenance, refer to
C: Fuel Return to Tank
9Y1211108ENM0029US0
9Y1211108ENM0030US0
(2) Injector
9Y1211108ENM0031US0
KiSC issued 07, 2015 A
"3.