Between the injection pump and the injectors is a fuel rail which distributes fuel to all cylinders, and fuel flows between them through steel connector tubes. There is an injection pump which creates the high-pressure fuel, and injectors that deliver fuel directly into the combustion chamber. The First Common-RailĮvery common-rail diesel engine has the same basic parts to its fuel system, whether it’s a Cummins, Powerstroke, or Duramax. So, to help LB7 owners keep their beloved diesel on the road for another 20 years, we’re breaking down the right way to diagnose and repair failing LB7 injectors. If you own a 2001 to 2004 LB7 Duramax powered rig, there is a pretty good chance the injectors have already been replaced at some point, but there are still many trucks operating today that will experience injector problems. Unfortunately, fuel injector failure was a very common problem with the new powerplant. The LB7 Duramax used an innovative design to get fuel into the combustion chamber, and their R&D paved the way for Ram and Ford to follow a few years later. This was exactly what happened to GM when they introduced the world’s first high-pressure common-rail direct-injected diesel engine (in a pickup truck) back in 2001. Sometimes when you’re the first to market with a new product, there are growing pains that come along with your innovative design that take a while to work through.
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