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Check engine light tester says low rail pressure

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check engine light tester...
check engine light tester says low rail pressure
Submitted: 8 months ago.Category: Chevy
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Answered in 7 minutes by:
12/11/2017
Chevy Mechanic: Pete, Auto Service Technician replied 8 months ago
Pete
Pete, Auto Service Technician
Category: Chevy
Satisfied Customers: 33,303
Experience: 14 years GM dealer Technician.
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Hi, my name is ***** ***** I will be happy to assist with this today.In some cases, I may need more info to assist better.I apologize for any delay.

Low rail pressure on this engine is usually caused by either the fuel filter being restricted needing replaced, an external fuel leak or an issue with one or more of the fuel injectors allowing to much fuel back through their return ports or to much fuel into the engine.

If the fuel filter has not been replaced in the last 10k to 12k miles I would start with replacing it.If this was already replaced or is replaced and does not resolve the fault then the fuel system needs to be tested further to see if any injectors are at fault or any issues with any fuel leaks.The best way to find a leak on this engine is with the engine off hand pump the fuel filter primer until firm then inspect all fuel lines and components for any leaks needing repaired especially around the fuel filter housing.

If it comes down to injectors needing to be tested there is a special test kit that is used that a shop or dealer would have to test these for you.Injector failure and fuel filter restriction are most common for this issue here on your Duramax engine.

If more help is needed, use the reply tab to continue our conversation. If no further assistance is needed, kindly rate my service, your 5-star rating is appreciated ( should be a link to click on here or above).You can rate at any time and we can continue to work on your question as this will not close out your question.Keep in mind in some cases it can be difficult to fully diagnose or help repair your vehicle without seeing it and I work on delivering the best possible answer from what I see to work with.

Thanks Pete

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Chevy Mechanic: Pete, Auto Service Technician replied 8 months ago

Hi, just checking in to see how things are going. Do you need further assistance?

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