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I have 2007 Duramax LMM
The other day it went on limp mode I had about 5 gallons left of fuel in it. On my way to get diesel my truck shut of on me wouldn’t come back on check engine light came on and code P0084

I changed the fuel filter thinking it was it but wasn’t. I changed the fuel filter housing and still wound fire up. It would try but nothing.

My next thing is the fuel pressure relief valve.

Any one run into this issue
Maybe cp3 pump

Hoping it’s not the injectors

Someone help me out
Truck only has 150k miles
Never pulled anything over 9k LBS my daily driver
 

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There are a few, pick one that fits your budget or make your own. Hookem Horns I believe made his own for about $50. But if your sucking air you may then find the fuel leak. You can try to pressurize your tank with 2-3 lbs of pressure and see if you see a seepage or a leak. As the lines get old they deteriorate and a hole may let air in under vacuum. Does the primer get hard and hold or does it leak down fairly quickly?
 
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