Originally Posted by TMAllison

Guessing this is related to you having replaced the return lines. Either the barbs are dirty/damaged/scored, the line is the wrong size or type (viton needs clamps oftentimes), the plug in #6 has disappeared or all of the above.

MB return line is gray braided fabric with a rubber core. Old stuff is black.

There is no reason the two injector halves should leak unless they have been taken apart sometime in the past and not put abck together correctly.

Atomized fuel that is sprayed at 2100psi into a hot combustion chamber shouldn't be able to come back up as a solid. Look for other solutions.

You asked about the inj socket.....it is "very" thin walled, maybe 3mm, with two vertical cutouts to clear the return line barbs. Its also around 4.25" long. If someone ahs removed them using something other than the factory tool the barbs may have been damaged which could be the cause of your fuel leak.

I'd concentrate on return lines and what I'd done to get them on and off it if it was mine.