Gasoline Injectors And Injector Rail; Service Line; Lpg / Natural Gas Fuel Lock Off - Kubota WG1605-E3 Diagnostic Manual

WG1605-G-E3,WG1605-L-E3,WG1605-GL-E3, DM
GASOLINE INJECTORS AND INJECTOR RAIL (G,
GL, GLN)
Kubota gasoline fuel delivery system, utilizes a fuel
rail, mounted with injectors, for each cylinder. The fuel
rail and injectors, are attached by Kubota. During the
design and calibration phase, the ECM gasoline fuel
delivery calibrations are developed. The EControls ECM
will utilize these calibrations, to pulse width modulate
each injector, to deliver the correct amount of gasoline,
for optimized performance, and reduced tail pipe
emissions. The injector
accomplished by supplying a 12.0 V supply to the
positive side of the injector coil, and switching the ground
circuit side, using the injector drivers, internal to the
ECM.
Because Kubota gasoline fuel system, utilizes the
Fuel Pressure Manifold, to control fuel delivery to the rail,
Kubota fuel system does not use a separate return line,
from the fuel rail assembly. Gasoline injectors are an
emissions control device, and do not require periodic
adjustment. When serving or placing injectors, use only
Kubota replacement injectors, to insure the fuel system
operates as designed.
WARNING
NEVER CUT OR WELD ON EITHER THE LPG / NATURAL GAS
OR GASOLINE FUEL TANK. REPAIRS TO THE FUEL TANK
SHOULD ONLY BE MADE BY A CERTIFIED TANK REPAIR
FACILITY.
FAILURE TO OBSERVE THIS WARNING COULD RESULT IN
SERIOUS BODILY INJURY AND OR DEATH AND COULD
RESULT IN SERIOUS PROPERTY DAMEGE.
WARNING
ALWAYS WEAR PROTECTIVE EYEWESR AND GLOVES WHEN
PERFORMING MAINTENANCE ON THE LPG / NATURAL GAS
OR GASOLINE FUEL SYSTEMS, TO PREVENT SERIOUS
INJURY. ALWAYS PERFORM MAINTENACE PROCEDURES IN A
WELL VENTILATED AREA AND INSURE THAT THERE ARE NO
EXTERNAL SOURSES OF IGNITION.
pulsing or "firing", is
1-47
SERVICE LINE (L, N, GL, LN, GLN)
LPG / Natural Gas flows from the fuel tank to the
electric lock, via the service line. The service line is most
commonly connected to the tank, utilizing a quick
coupler. The other end of the service line is connected to
a "bulkhead connector" which is used to allow the
service line, to pass through the metal enclosure, vehicle
body panels, or hoods. This hose is made of special
material, which protects the inner core of the hose, from
chemicals contained within the LPG / natural gas, which
could result in a failure of the hose. The hose should
never be kinked or allowed to come into contact with the
chassis, or other engine components, and electrical
connection or wiring. When replacing the fuel line, use
care as there may be fuel retained in the line between
the tank manual valve connection, and the electric lock
off device.
LPG / NATURAL GAS FUEL LOCK OFF (L, N, GL, LN,
GLN)
The LPG / Natural Gas Fuel Lock Off device is an
integrated assembly. The electric lock assembly is a
12.0 V, normally closed valve. The solenoid is mounted
to the valve body. When energized the solenoid opens
the pilot valve, within the lock off, which uses the tank
pressure, to assist in opening the valve. By using the
pilot valve, to help open the valve, the service life of the
valve, is extended, and requires less electrical energy, to
open the valve. The valve opens, during cranking, and
remains open, during the run cycles of the engine. The
lock off supply voltage is controlled by the Engine
Control Module (ECM), or may be energized by a relay,
which supplies battery voltage, when energized.
Figure 13: Typical In-line LPG / Natural Gas Fuel Lock
Off device
ECM SYSTEM
KiSC issued 12, 2016 A