I saw what allen just mentioned with mine, it drips down and pools on top of the little shelf when the return line leaked. the old MB mechanic I watched assess it wiped it off with a rag clean and dry to see where it was coming from. Now I did have a set of injectors rebuilt and one was not fully torqued on rebuild and did leak a little. we just re-lapped and re-torqued. I am lucky to have an old Yoda of mechanical injection down the road, he has been working on these for a long time, and seems to live with a permanent coat of diesel on his extremities.
Do things that are hard, and your life will be easy. Do things that are easy and your life will be hard.
-thad in idaho. '04 G500+'81 lwb 240gd