Check 3-way fueloil selection valve located before fueloil pump unit and change the 3-way valve to MDO/MGO side.
检查位于燃油输送泵前的三通燃油切换阀,并转换到MDO侧。
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Open system is the pump suction from the tank, the oil through a variety of control valves, the drive hydraulic actuators, valveoil return back for another fuel tank.