Duramax Second Generation: 2004.5-2005 (LLY)
Having a hard time with this…. Injector 6 (3rd back on driver side) was at first slow leak.. pulled it out, there was no o-ring on it, put a new one on and it’s still leaking but now it worst… pulled it back out and took it to a shop here local and got a new copper seal and another new o-ring...