While known for being very reliable, the 6.6-liter LBZ Duramax engine is vulnerable to fuel system issues. +Read more
The engine’s direct-injection fuel system pumps fuel through the injectors at 26,000 psi. However, the LBZ Duramax injectors are prone to cracking and leaking as the miles pile on. Inside the injector, the ball seat can decay and lead to fuel dripping into the crankcase. Symptoms of a failing injector include hard starts, excessive smoke while idling, and fuel in the engine’s oil.
This generation of Duramax engine also lacks a lift pump, leading to additional strain on the injection pump. As a result, the Bosch CP3 injection pump has to work overtime to properly pressurize and deliver the fuel to the injectors and cylinders. The only way to ensure that the injection pump does not fail prematurely is to install an LBZ lift pump.
ProSource Diesel offers everything you need to keep your Duramax’s fuel system working properly, including LBZ fuel lines, injectors, fuel filters, and more.