3. Electric System
3-34
3.16.1
Supply pump
The fuel passes the pre-filter and is pressure-fed by a fuel feed pump to the main filter, then it
arrives at the supply pump. The ECU controls the opening of the intake metering valve and adjusts
the fuel intake volume so that the rail pressure is at the target value. The fuel pressurized in the
supply pump is fed to the rail.
PC14032
3.16.2
Rail
A pressure of up to 160MPa is accumulated in the rail. The rail is equipped with a rail pressure
sensor and it sends information to the ECU. In the case of an abnormal increase in the rail pressure,
the mechanical relief valve opens to prevent the pressure increase.
3.16.3
Rail pressure sensor
PC14033
YANMAR part number (Rail ASS’Y):129A00-57000
※
Do not replace the rail pressure sensor and relief valve.
If it is damaged, replace it as rail assembly.
Fuel temperature
sensor
Rail pressure sensor
Rail
Relief valve
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