Originally Posted by dauber

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99 606 injectors rebuilt about 5,000 ago. I pulled the cover of the the top of the injectors to inspect the plastic breather tubing that is leaking and I found this in the third injector well (full of diesel)

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I swapped out some return line from another injector to see if it was the new return line that I replaced at the same time with the injectors. With engine running it looks like bubbles at the bottom of this injector so I pulled injector to see if I installed the seal wrong and it I think its correct (above pic) and I re-torqued but I still get bubbles at the bottom of the injector.

This is what I think is the wrong way to install the injector seal:
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