Bad Injector?

Just change the failed one if that's the issue. You sure its fuel and not oil slobber out of a failing turbo?

 

Years ago I worked for a company that only changed air filters by restriction gauge reading. If it is high in the yellow just reset it this PM as it could be from rain.
A truck came in for regular PM with no complaints. It was dripping oil out the exhaust flex pipe. Supervisor said the turbo is bad replace it. I did and it still dripped oil out the flex pipe. Pulled the records and went through it. Filter had over 400,000 miles on it. Pulled it out and it was all packed up and had one bird in it. That ended the exhaust dripping oil. Would have thought it would have low power complaints, blowing black smoke, etc.
Never say always and always say maybe. Wonder how much fuel and engine wear that cost.

 

Pull the manifold off and look for the smoking hole.

 

I had one fail on my Detroit. Put 10 gallons of fuel into the pan before shutting down. Finding the bad injector was simple. The solenoid was leaking, squirting fuel out. Very obvious once I pulled the valve cover off. Another time, I had a blown tip, fuel was dumping into exhaust. The exhaust manifold gasket was all wet from fuel seeping around the bad port.