Diesel Fuel Injector Cap Tool for 2003-2007 5.9L Dodge Cummins ISB

Diesel Fuel Injector Cap / Block-Off Tool for 5.9L Dodge/Cummins ( Sold Individual ) fits: 2003 - 2007 Dodge / Cummins REPLACES: Miller 9011 / GM EN-47589-1 NOTE: This tool will also work on Duramax applications 2001- 2005 If the pressure is less than 5,000 PSI on a 5.9L engine, 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. This 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. This tool will also work on other vehicles with a 18mm fuel line nut.