Fuel Systems for 2004.5-2005 6.6L LLY Duramax

The direct-injected LLY Duramax is equipped with a Bosch CP3 injection pump, a high pressure common rail system, and electric fuel injectors, resulting in a maximum injection pressure of 23,000 psi. However, the LLY’s fuel system can have issues later down the road.

Common to Duramax engines, the LLY does not have a factory lift pump. Instead, the injection pump moves and pressurizes fuel from the tank to the injectors, causing more stress on the pump. To extend the injection pump’s longevity, installing an LLY lift pump can help maintain proper fuel rail pressure, especially after modifications. +Read more

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