Medium and Heavy Trucks
Have Truck Repair Questions? Ask an Expert
Thanks for asking your question. I will try and help you out.
The plug you see that is leaking is there to plug the fuel rail that runs through the head. The rail is drilled through the head to feed the injectors with fuel. You most likely have a failed O ring on the plug.
Please reply back if you need more help or have more questions. I am happy to assist.