A failing Cummins injector cup can cause several noticeable symptoms, including: Coolant in the fuel system (milky fuel or oil) Engine misfires or rough idling due to improper fuel sealing White smoke from exhaust (indicating coolant burning) Loss of coolant without visible leaks Since injector cups are sealed insi
What Are Cummins Injector Cups and Why Are They Important?
Cummins injector cups are small but critical components in diesel engines, acting as a seal between the fuel injector and the cylinder head. They prevent coolant and oil from mixing with fuel while maintaining proper injector alignment. Over time, injector cups can crack or wear out due to heat and pressure, leading to leaks, poor engine performan