2011-2016 Duramax CP4 Fuel Injection Pump (12661059)

The CP4 pump pressurizes and propels diesel fuel into your Duramax engine's internal combustion chamber through the fuel injectors.

While the previous models (2001-2010) relied on the stable yet inefficient CP3 pump, the CP4 is a powerhouse that packs high pressure with less volume for maximum efficiency and cost-effectiveness. 

Even though it's more efficient, the CP4 platform has some erosion problems that can send metal debris through your fuel system. Accumulation of this debris will eventually lead to a total breakdown and costly repairs.

Part Number: 12661059

• Maximum Efficiency
• No Core Charge
• High-Quality

Parts Only

• 1-Year Warranty

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• ?

  With respect to the CP4 feul pump, at what mileage should the pump need to be rebuilt or replaced?

  CP4 failures are common between 80k-150k miles - but they are not rebuildable; full system replacement is often needed if it fails.