CP4 Injection Pump
The Bosch CP4 is a high-pressure common rail injection pump used in many modern diesel engines (GM Duramax, Ford Power Stroke 6.7L, RAM EcoDiesel). It's notorious for catastrophic failures caused by i...
Grant Taylor
Fleet Solutions Director, Fuel Ox
What Is CP4 Injection Pump?
The Bosch CP4 is a high-pressure common rail injection pump used in many modern diesel engines (GM Duramax, Ford Power Stroke 6.7L, RAM EcoDiesel). It's notorious for catastrophic failures caused by insufficient fuel lubricity — when metal shavings from the pump contaminate the entire fuel system, repairs can cost $8,000-$12,000. ULSD's reduced lubricity has made CP4 failures more common, making lubricity additives essential for these engines.
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