This high-pressure common rail fuel pump, part number 28672159 (Yuchai factory part number S010001111100011), is a genuine Delphi-system replacement designed for medium-duty commercial vehicles. It is specifically calibrated for Yuchai National V and National VI emission standard diesel engines, commonly equipped on regional logistics trucks, urban distribution vehicles, and municipal utility trucks.
The 28672159 pump features an integrated Inlet Metering Valve (IMV) to regulate fuel volume entering the high-pressure chambers, sustaining rail pressures required for precise cylinder injection. Under heavy transport loads, internal mechanical wear or pressure drops within this pump assembly typically trigger diagnostic trouble codes (DTCs) such as P0087 (Fuel Rail Pressure Too Low), P0251 (Fuel Metering Control Malfunction), or related fuel delivery system fault codes, which cause engine power derate, rough idle, or hard-starting issues.
Replacing the faulty unit with this genuine 28672159 pump restores the factory fuel delivery curve and corrects rail pressure fluctuations. The pump is supplied with the pre-installed IMV valve and drive gear shaft seals, designed for direct-fit installation onto the engine’s gear train without timing modifications.
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