Common Cummins Injector Cup Problems and How to Troubleshoot Them

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2025-11-24 14:27:23 -

Injector cups (also called injector sleeves) play a critical role in sealing and isolating the fuel injector from engine coolant in Cummins diesel engines. When an injector cup becomes damaged or loose, it can cause fuel leakage, coolant contamination, hard starting, or severe engine misfires. Knowing how to troubleshoot Cummins injector cup problems helps prevent major engine damage and costly...

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