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CARB APPROVED. "Disaster Prevention Kit" ( CP4 Bypass Kit ) As many 6.7L Powerstroke owners have become painfully aware, the high pressure fuel pump (also known as a CP4 pump) has a design weakness. When the CP4 pump fails, it will shed tiny particles of metal throughout the entire high pressure fuel system.
Also asked, why do cp4 pumps fail?
Air in the pump means that metal rubs against metal, causing accelerated wear. This will eventually cause the CP4 to fail, often around 100,000 miles. Before it fails, metal shavings are produced by the CP4, which travel into the fuel injectors and the fuel lines with catastrophic results.
Beside above, how does a cp4 pump work?
Operation of the CP4 The pump camshaft is driven by belts, chains, or cogwheels and moves the pump pistons to generate the required high pressure. The fuel is delivered as required using an integrated cogwheel pump or electric fuel pump. The engine control unit enables the delivery of the required quantity of fuel.
Found on '11-to-present Power Stroke and Duramax engines, the CP4 is a more advanced pump despite flowing less fuel, with external high-pressure circuits and a maximum pressure of 29,000 psi. Maximum pressure checks in at 24,650 psi, but it's the pump's volume that makes it a winner on the Ford engine.