Originally Posted by
frank.williams741
What is the plugged return orifice in the tank? I am working on my father-in-laws 03 Duramax with fuel in oil issue. Replaced all injectors, just replaced cp3 pump and same issue. It has put roughly 2 quarts in less than 50 miles. Also it has a slight hazy smoke at idle. Other than the fuel in oil issue it is a great running truck. He bought it used a few months ago with 107k miles and didn’t catch this issue. I want to see if the return orifice you refer to could be the culprit before we tear back into the motor. Thanks!