06/22/2026
Had this 2016 LML Duramax come in that would not start without a bump of starting fluid. After a thorough inspection of the fuel system to make sure that the CP4 high pressure fuel pump didn’t show signs of wear/contamination, I moved on to injector testing. Found all of the injectors were worn just enough to not let it fire while cranking, but run fine once started. Got all 8 fuel injectors replaced and she fires right up now. Another truck ready to get back to work, and I was glad to get it back out there!