Its leaking outside of the injector.As you look down at it diesel collects in the little ridge where the upper body screws into the lower body, and around the injector on the block. Not alot, but its there.
The rubber lines are the most common spot for them to leak for sure... They can also leak from the fitting where the high pressure line attaches, or they can seep between the two halves of the injector body. But if the lines haven't been off recently, and the injectors haven't been touched in a long time then it's almost always going to be the rubber lines.
It was the rubber line. I just replaced all of them a few months ago, but I let the engine warm up and than held the throttle at some decent load, and could see it seeping ever so slowly outta the line where the rubber meets the metal. So I am gonna cut it and stick it back down on there as I did go a little long on the replacement just in case.Its not alot but it annoys me. Just happy its not the injector itself.