This set includes 3 common sizes of diesel injector caps/block-off tools, giving you the versatility to work on and diagnose fuel system issues on both Chevrolet/GMC Duramax and Dodge/Cummins engines.The TamerX TXCT-PKG1 Diesel Fuel Injector Cap/Block-Off Tool Set includes the following tools:1- 14mm Cap for 2001-2005 6.6L Chevrolet/GMC Duramax (LB7 & LLY) and 2003-2007 5.9L Dodge/Cummins1- 16mm Cap for 2011-2016 6.6L Chevrolet/GMC Duramax (LGH & LML)1- 18mm Cap for 2006-2011 6.6L Chevrolet/GMC Duramax (LBZ & LMM) and 2007-2017 6.7L Dodge/Cummins This diesel fuel injector cap/block-off tool set is a toolbox essential for everyone working on Duramax, Powerstroke, and Dodge/Cummins fuel systems.When a diesel engine fails to start, your first troubleshooting step should be to check fuel rail pressure. If the pressure is low, the most likely culprit is a defective diesel fuel injector returning excess fuel back to the tank. A return flow volume test will allow you to determine if excessive fuel return flow is the issue.To identify the individual cylinder that is at fault, you will use this cap/block-off tool. The diesel fuel injection line is removed from one cylinder at a time and the cap is then installed on the fuel rail in place of each injection line. When the bad injector is blocked off, the fuel pressure at the rail will increase and your engine will start.In some situations, it can be useful to have multiple block-off tools, because multiple diesel injectors returning a small amount of diesel fuel will display the same symptoms as an individual diesel injector returning an excessive amount of fuel.The diesel injector cap tool can also be used for diagnosing engine knocking sounds that could possibly be caused by a diesel injector or a single cylinder issue, especially on engines where you can't use a scan tool or if a scan tool is unavailable.
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