Related Photo Galleries
Since this is an older LB7 Duramax, it is not possible to service or even look at the injectors without taking the valve covers off. This is not the case with the later LLY Duramax since it uses external fuel injectors. Besides easier serviceability, this later design lessens the risk of getting fuel, coolant, and oil where it's not supposed to be. It's interesting to remember that 23,000 psi of pressure is contained in these fuel lines.