This unit is mainly used to supply the fuel to the main engine and optimize the quality of HFO. The fuel in the oil tank heated up to 70 celsius degree, enter the oil inlet through the strainer and supplied by the feed pump to the mix tank and mix the return oil. After that, circulating pump boost the fuel to the heater to decrease the viscosity by heating. The fuel filtering by the fine filter, the temperature of the fuel is automatic controlled by the viscosity control system. The qualified fuel is supplied for the main engine. Our fuel supply unit has 15series with 74 models. KHVU-CIII-XE-C is the very ordinary model, its configuration integrates oil feed pump, circulating pump, strainer, auto filter or duplex backwash filter, flow meter, mixed oil tank, composite heating device, viscosity and temperature control system with the technique data and outline diagram below.