AccurateDiesel 5.9L Cummins Diesel Injector Block-Off Tool / Cap by AccurateDiesel at Daily News Detroit. MPN: 9011. Hurry! Limited time offer. Offer valid only while supplies last. When a Cummins common rail engine will not start, the very first thing to check is fuel rail pressure. If the pressure is less than 5,000 PSI, 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
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