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The Industrial Injection CP4-to-CP3 conversion kit for 2011–2016 GM Duramax 6.6L LML replaces the factory CP4 arrangement with a CP3-style pump to address known CP4 failure modes. This vehicle-specific kit includes the replacement pump and installation components and explicitly requires no ECU tuning. It provides a direct-fit remedy aimed at improving long-term fuel system reliability for affected Duramax LML diesel owners.
Industrial Injection 11-16 GM Duramax 6.6L LML CP4 to CP3 Conversion Kit w/Pump (No Tuning Required)
