Industrial Injection Fuel Injection Pump Kit DCR GM L5P 2017-23 - Pump and Line Kit 608990

This HP4 to DCR fuel pump conversion kit is designed for 2017–2023/2025 GM 6.6L Duramax L5P engines. It replaces the factory-installed HP4 high-pressure fuel pump with a DCR fuel pump and includes the necessary fuel tubes for a clean and correct swap. The result is an OEM-style conversion that supports consistent high-pressure common rail operation for daily driving, towing, and demanding use. The Stanadyne 608990 is a premium high-pressure fuel pump conversion kit that delivers superior pressure, flow, and durability compared to the factory Denso HP4 pump. It's designed to resolve pressure regulation issues experienced with the HP4, offering enhanced fuel pressure capacity and improved throttle response without requiring ECU tuning.