![]() of torque, which made it extremely popular with truck owners in the early 2000s. While the numbers may not seem that impressive by today’s standards, the LB7 Duramax produced a best of 300 horsepower and 520 lb.ft. As emissions regulation increased and the consumers demand for towing power at the turn of the century, the benefit of a common-rail diesel became readily apparent. The beauty of a common-rail injection system is it can atomize the fuel into a much smaller droplet, and the ECM has greater control over the timing and amount of fuel, which means more power and efficiency compared to previous injection designs. Inside the injector is a small pintle valve that opens and shuts to deliver fuel in the precise quantity, and it’s all actuated by an electrical solenoid (or by a piezoelectric crystal in later model trucks, but that’s a conversation for a different time). 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. We do not research by customer name, only invoice # or RA #. PLEASE RETAIN RA#, INVOICE # AND TRACKING NUMBER UNTIL CREDIT IS RECEIVED BY YOU. ![]() Include copy of original invoice and RGA inside box.Please write on the box “Core Return” and have RA # clearly written on the outside of box.All shipping charges are the responsibility of the customer.These boxes are UPS approved to reduce damage while being handled in freight. Please re-use boxes and bags that parts were shipped in originally.NOTE: packages that have fuel or oil residue on the outside of the box during shipping will not be delivered by UPS or the postal service which will cause delays. ![]()
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