Electric Gasoline Fuel Pump; Gasoline Fuel Pressure Manifold - Kubota WG1605-E3 Diagnostic Manual

WG1605-G-E3,WG1605-L-E3,WG1605-GL-E3, DM
ELECTRIC GASOLINE FUEL PUMP (G, GL, GLN)
To supply gasoline to the fuel system, the Kubota
bi-fuel system will utilize 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 Kubota, will
be used to transfer the pumped fuel to the Gasoline Fuel
Pressure Manifold assembly. Kubota 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 filter maintenance,
Recommended Maintenance Chart.
Figure 11: Electric Gasoline Fuel Pump
GASOLINE FUEL PRESSURE MANIFOLD (G, GL,
GLN)
The Kubota gasoline fuel system, utilizes a Fuel
Pressure Manifold assembly, to control the delivery
pressure to the gasoline injector rail. The manifold is
mounted to the chassis, between the electric fuel pump
and the gasoline injector rail. The manifold is attached
with a sensor, which provides the ECM with the gasoline
fuel temperature, and pressure being regulated to the
gasoline injector rail. The ECM uses the fuel
temperature and pressure, to calculate the precise
amount of gasoline, to be injected to the engine during
operation. The manifold is designed into the system, to
refer to the control pressure, as well as the amount of gasoline, to be
returned to the fuel tank. In normal gasoline delivery
systems, the electric fuel pump, delivers a constant
pressure to the injector rails, and allows a significant
amount of fuel to be recycled to the tank, thus causing
the gas to heat and vaporize, and requiring the use of a
vapor recovery system to control the excess vapor. The
Kubota system manages the fuel pressure at the
manifold and minimizes the amount of returned fuel, thus
reducing the vapor fuel in the tank.
Figure 12: Gasoline Fuel Pressure Manifold
1-46
ECM SYSTEM
KiSC issued 12, 2016 A