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Thanks for posting these instructions! I did this replacement last weekend. I will not know until our next trip in August whether or not this fixed my issue.

I did want to add a note that may help other people. On my 2008 the line by the transmission was about 11" long and the line in the engine area was about 4.5" long. I mention this because I did not see it in the thread and did not know how much hose to order and ended up ordering way more than I needed. Hope this helps someone!

Also, cutting the factory clamps was easy on 3 out of 4 of them. The most difficult clamp was in the engine area that was the closest to the ground. My dremel did not really fit without moving/removing the hose that goes to the intercooler/turbo (at least I think that is what that hose is for, my Duramax knowledge is very much lacking).
 
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Any Updates Just Threw a Code Low Rail Pressure did this fix your issues
It looks like it might have fixed the issue. We went camping last weekend and towed in the mountains with no issue. I was accelerating up the hills with the A/C going and had no codes thrown. The real test will be in August when we go on a 2 week camping trip.

I should mention that I also changed the fuel filter just in case it was the issue, so maybe that helped too.
 

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Just got back from our trip and we had no error codes! We towed over Wolf Creek Pass and a few other smaller passes, which is a pretty good test.

Now I need to figure out my cooling issue. First thing I am going to look at is the cooling stack to see if there is a bunch of junk built up.
 

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I used my used oil pan and dumped the fuel in with my used oil.

Yes, I was worried about cutting the line too but if you are very careful and cut in the correct location the fuel does not come out until you pull the line off. You will be cutting metal so there will be some sparks flying. I used a dremel with a small cut off wheel.

Also, be careful to not go too deep or you will cut into the flare on the metal line. You need that flare in good condition so your new hose can seal around it.
 
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