Product Name: Gear Fuel Transfer Pump
Part Number: 21539988, Cross reference: 20752633, 20484215
Application: For Volvo, compatible with D12A, D12D engines. Fits Volvo FH12, FM12, FL12, NH12 heavy-duty trucks, North America VN, VNL, VHD series trucks, also suitable for Volvo B6, B7, B9, B10, B12 series buses.
Function: It is a component of engine fuel supply system. Driven by gear transmission, it extracts diesel from the fuel tank and delivers fuel to the high-pressure fuel pump to maintain stable fuel supply and normal operation of diesel engine.
Common faults: Internal gear wear, seal oil leakage, insufficient fuel supply pressure.
产品名称：齿轮式燃油预供泵（输油泵）
零件号：21539988，替代件号：20752633、20484215
适配：沃尔沃，适配 D12A、D12D 发动机；适用 FH12、FM12、FL12、NH12 系列重型卡车，北美 VN、VNL、VHD 系列卡车，适配沃尔沃 B6、B7、B9、B10、B12 系列客车。
功能：属于发动机燃油供给系统配件，依靠齿轮传动从油箱抽取柴油，将燃油输送至高压油泵，保证发动机供油稳定，保障柴油发动机正常运转。
常见故障：内部齿轮磨损、密封件渗漏油、供油压力不足。
