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Discussion Starter #1
Hi,
Got a question about the 2500 HD with Duramax fuels lines. I want to put a pre OEM filter in back by the fuel cooler. Posts and pictures have shown the filters on the larger line (the ½ inch). In the GM shop manual the flow diagram shows the fuel going from tank > cooler > filter. On my truck that’s the small line.
Are the post with filter on the large line really on the return line like they look? What gives???

Erwin


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You want the supply line not the smaller return line for your filter setup install in and out thru the filter head .....





Mac
 

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Yup.


Can't remember where I stumbled across that little tidbit, but yes the cooler is on the return line.


I think it has to do with preserving the chemical characteristics of the fuel by not accelerating any possible condensation caused by introducing warm fuel into a cold tank, or bacterial growth in the tank, since the bacteria like a warm moist environment.Edited by: Zeeb
 

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Discussion Starter #5
That's neat, just another error in the GM service manuals. Thank you Helms & GM


(I have been putting a CST 6 inch lift kit on my truck this weekend and finding all kinds of other minor errors in the front end section !!)


Thanks for the info guys !!
 
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