The 0445020517 is a genuine Bosch CP4 series high-pressure common rail fuel pump, carrying Cummins OEM factory numbers 530 3387 and 5303387RX. This assembly is designed for Cummins ISF3.8lt (3.76L) Euro 4 and Euro 5 emission-compliant 4-cylinder diesel engines, including engine ratings ISF3.8s3141 (140HP), ISF3.8s3154 (156HP), and ISF3.8s4168 (168HP).
Vehicle and equipment applications include Foton Aumark C / Ollin CT, GAZ Valdai (GAZ-33106), JAC Gallop / Junling, Dongfeng Captain, and Hyundai Mighty commercial trucks, as well as 3.5-ton to 8-ton light-duty cargo haulers and bus chassis.
This CR/CP4N1/L50/20-S pump utilizes a heavy-duty single-plunger CP4 architecture driven by the engine gear train, integrated with an internal mechanical feed pump and a solenoid metering valve. Replacing a worn pump with this genuine CR/CP4N1/L50/20-S (Cummins 5303387) unit cures active fault codes FC559 (rail pressure low) or FC2216, restoring 1800 bar rail pressure, resolving long hot-engine cranking, and stopping power derate under heavy payloads.
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