iDeretool 18MM Common Rail Fuel Injector Block-Off Tool M18 Cap for 2007-2018 Dodge Cummins 6.7L Diesel and 2006-11 Duramax 6.6L LBZ LMM (4PCS)

When the pressure of the common rail is too low to start the engine, one of the possible reasons is a defective diesel fuel injector returning excess fuel back to the tank, to identify the individual defective cylinder, you can remove the diesel fuel injection line from the cylinder, and use this block off tool instead of diesel fuel injection line to seal common rail pipe. If the engine can be started normally, and the common rail pressure return to normal value. It prove that the injector of this cylinder is malfunction. If your scanner cannot perform certain tests, this diesel injector block off tool can also be used for diagnosing engine knocking sounds that could possibly be caused by a single cylinder issue. In some situations, You may need several block off tools to test several injectors at the same time. In a word, this is a "must have" tool for anyone who works on Cummins and Duramax common rail fuel systems. Inner Diameter: M18 Thread Interval: 1.5 Compatible with 2006-2011 6.6L Chevrolet/GMC Duramax Engine LBZ & LMM Compatible with 2007-2018 6.7L Dodge Cummins