Yanmar 2gm20f fuel seepage

Update

A look at the Yanmar service manual revealed that the assembly in question has an o-ring at its base, which would be the logical source of the leak.  (#2 in the exploded drawing.)

Thankfully, this turned out to be the problem, and after removing several coolant hoses for access, the repair was straightforward.   Unsurprisingly, after 30 years of heat, diesel and pressure, both O-rings were somewhat hardened and no longer round in section.     Total cost to repair less than $10.   There are springs under pressure that are released in this situation however they don't leap to freedom and a reasonable amount of care is all that's required.  There was a small amount of corrosion evident in the o-ring groove, and i cleaned this and greased the area and the fitting's threads, for benefit of Windstar's future owner who will doubtless deal with this again in 2058.

This made a surprising difference in the livability of Windstar's interior.  Doesn't take much diesel to perfume the entire living space.

Update

 - used ye olde Baby powder trick and the leak is at the base of one of the injector lines .  See below.
This basically means degreasing the area.   Once the engine is basically clean (hopefully it always is...) , use aerosol brake parts cleaner to remove any residual diesel film.   This stuff is effective, leaves no residue and dries quickly.  When the talcum is applied it is white and dry and it will be immediately evident when any fluid dampens it as you can see in the photo.  Thus, if you are watching closely you can determine the source of the leak, even if it quickly flows elsewhere.  Handy.

Windstar’s engine is seeping in the area of the high pressure fuel pump.   Diesel collects around the serial number shown in the photo below and slowly migrates down the starboard side of the engine.

Any suggestions as to source and remedy?

Many thanks!