How to Check Injectors on Diesel Engine

March 12, 2020

Ultimate Guide to Diesel Fuel Injectors for Cummins, Detroit Diesel, and Caterpillar Engines


1. What Does a Diesel Fuel Injector Do?


2. Core Symptoms of Bad Diesel Fuel Injectors


Common Signs of Injector Problems:


3. Brand-Specific Notes on Injector Symptoms


3.1 Injectors For Cummins Engines




3.2 Injectors For Detroit Diesel Engines



3.3 Injectors For Caterpillar Engines




4. How to Diagnose Bad Injectors


4.1 Listen for the Click


4.2 Perform a Light Test


4.3 Check for External Leaks


4.4 Emission Test / Exhaust Observations


5. Why Diesel Injectors Fail


6. Maintenance Tips to Extend Injector Life


7. When to Replace Injectors


8. Buying Replacement Injectors at Diesel Pro Power


8.1 Cummins Diesel Injectors


8.2 Detroit Diesel Injectors


8.3 Caterpillar Injectors


9. Additional Injector Troubleshooting FAQs


Q: Can I run only one or two new injectors?


Q: What about rebuild kits vs complete injectors?


Q: How important is injector pop pressure?


Q: Should I do an injector return flow test?


Q: Are Diesel Pro Power injectors covered under warranty?


10. Why Buy from Diesel Pro Power?


11. Explore Our Online Injector Catalogs


Detroit Diesel Marine Injector Catalog


Cummins Marine Injector Catalog


Caterpillar Marine Injector Catalog


12. Final Takeaway: Don’t Delay Injector Diagnosis


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How to Check Injectors on Diesel Engine