Are you the local Duramax expert? Be prepared for any Dmax that rolls in the door with this three-piece block off tool kit. - The cap on the left fits 2001 - 2004 LB7 - The middle cap fits 2006 - 2010 LBZ and LMM - The cap on the right fits 2011 - 2016 LML and LGH NOTE: The LB7 cap will also work on 2003 - 2007 5.9L Cummins. The LBZ/LMM cap will also work on 2007 - 2017 6.7L Cummins applications. These tools are a "must have" for anyone who works on Duramax common rail fuel systems. When a Duramax common rail engine will not start, the very first thing to check is fuel rail pressure. If the pressure is less than spec, one of the most likely causes is a defective injector that is returning excess fuel back to the tank. A return flow volume test will verify if excessive return flow is the problem. A cap is then used to identify the individual cylinder that is at fault. The injection line is removed for one cylinder at a time and the cap installed on the fuel rail in place of the injection line. When the cylinder with the offending injector is capped, the rail pressure will rise and the truck will start. In some cases it can be highly advantageous to have multiple caps, because several injectors that return slightly too much fuel can have the same effect as a single injector with extremely excessive return flow. To purchase complete sets of block off tools, please see our other listings. Injector block off tools can also be useful for diagnosing engine knocking sounds that may be attributable to an injector or a single cylinder problem particularly on engines where this capability is not available through the scan tool, or a bi-directional scan tool is not available. When working on high pressure fuel systems, always educate yourself first by reading appropriate factory service information, use common sense, and, above all, WEAR SAFETY GOGGLES!
Z**W
as described
arrived on time fits just fine
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