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What is a Cummins injector cup and why is it important?
A Cummins injector cup is a small but critical component that sits in the engine’s cylinder head, providing a sealed passage for the fuel injector. Its main role is to isolate coolant from the combustion chamber and prevent leaks that could lead to misfires or contamination. Although injector cups are often overlooked, a damaged one can quickly affect fuel efficiency, engine performance, and overall reliability. Keeping them in good condition ensures stable injection pressure and long-term engine durability.
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