Duramax Diesel Fuel Injectors: Signs of Failure

Are you having problems with your Chevy Duramax diesel engine fuel injectors? Is it time to replace these vital components? 

As we're sure you know, you want your fuel injectors working correctly to maintain normal engine function. But what causes problems with your common rail injectors? How do you know when it's time to replace them? 

We're taking you through the symptoms that your Duramax fuel injectors might be failing and the possible causes of failure. Keep reading to learn more!

You can also check out our video for more information:



Highway & Heavy Parts has a great selection of fuel injectors and other fuel system components. Let our ASE Certified Technicians help you find the right parts for the job!

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Symptoms of Failing Duramax Fuel Injectors


duramax injectors sings of failure | Highway & Heavy Parts


If you think your common rail injectors are failing, there's a few symptoms that you can look out for. These include:

  • Excessive Smoke
  • Power Loss
  • Rough Idle
  • Fuel in Oil
  • High Return Fuel
  • No Start

If you're experiencing any of these symptoms, it might be time to replace your fuel injectors. For example, coolant or fuel could enter your oil supply because of a faulty injector. These are not effective lubricants, and can cause problems down the line. Check out our post to learn more about what contaminated oil can do to a turbocharger.


What's Causing Your Duramax Fuel Injectors to Fail?

If your fuel injectors have failed, you probably want to avoid the issue in the future if possible. There are a few things you should be aware of that can help prevent issues with your fuel injectors in the future. These include:


duramax injectors avoid cheap fuel | Highway & Heavy Parts

  • Diesel Fuel Quality: The quality of the fuel you use can affect the performance of your injectors. Avoid cheap fuel up locations, where the fuel could have been sitting for long periods of time, becoming contaminated.  Instead, fill up at locations that move large amounts of fuel.
  • Operating Conditions: There are a few operating conditions that can negatively impact your fuel injectors, such as short runs, excessive idling, cool operating, and light engine loadings. These will cause deposit problems in your combustion chamber, exhaust spaces, turbocharger, and DPF filter.
  • High Pressure/High Temperature: These can degrade your fuel and leave deposits in pumps and injectors, which lowers the lubricating ability of your fuel.


duramax injectors high pressure temperature | Highway & Heavy Parts


For more in-depth information on causes of common rail fuel injector problems, check out our post, Diesel Engine Common Rail Fuel Injectors: Potential Failures & Causes.


What Can You Do About Failed Injectors?

Restore your Duramax fuel system with common rail injectors from Highway & Heavy Parts. 

We have injector options for your GM Duramax 6.6L LB7 and GM Duramax 6.6L LLY and LBZ diesel engines.

These injectors were crafted to strict OEM specifications, so you don't have to worry that your putting junk into your engine. 

With long-lasting strength and durability you can count on, these parts are equal or better quality as those you would get from the OE. Backed by a 1-year parts warranty, these common rail injectors are just what you need for your Chevy Duramax engine!


If you need common rail fuel injectors, Highway & Heavy Parts is here to help! Our ASE Certified Technicians are here to make sure your getting the components that will fit your engine. Call us at 844-304-7688, or request a quote online!