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Duramax Second Generation: 2004.5-2005 (LLY) Discuss the second generation (2004.5-2005 LLY) of the 6.6L Duramax diesel engine & associated components. 2006 LLY engine discussion belongs in Third Generation forum due to the differences of the 2006 LLY and the 2004.5-2005 LLY. Engine related discussion ONLY.

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Old 08-19-2019, 11:31 PM   #1 (permalink)
Polish Eagle
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Join Date: Aug 2014
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Im sure someone's been thru this ...
So I knew that my connectors at the fuel cooler lines had rust and some visible line rust from cooler to engine, and from fuel tank to cooler. Question is
If I'm replacing all fuel lines and cooler what kit was successful or do I use OEM again. And also I have a auto collision shop and mechanic. Should I watch out for a issue, like difficult areas, and is it tough to hook up the lines to the engine

2005 lly Duramax
original owner 175k
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Old Today, 08:00 AM   #2 (permalink)
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Join Date: Jun 2016
Posts: 2,097
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Michigan Oil Burners Member

All the fuel lines are discussed in (Maintenance & Fluids)
Might find something in one of these. If not there’s 100 more that might help.
Google (duramax LLY fuel line replace) lots of pointers.


As far as cooler 10371405 $124 the Dorman is about $20 more.
Don’t know of any other options for cooler.
Mike L. At one time was selling these.
NEW 2-4 MPG Fuel Cooler!
We are offering two options to choose from. Our Standard Fuel Cooler which is a highly efficient cooler set in an electric fan cooled design and our Heavy Duty Fuel Cooler which is twice the size of the standard cooler and is cooled by twin electric fans

Last edited by Rvn4me; Today at 08:24 AM.
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