"I have a Westerbeke W30 that suddenly started filling the sump with diesel. I noticed when the oil pressure started dropping."
"The engine was running well and smoothly so I believe that eliminates the injectors."
Hello, a few questions - so that we are on the same page:-
#1. Confirm the sump is the oil sump on the engine ?
#2. How did you ascertain that the sump was filling with diesel ?
#3. If the oil pressure was dropping - was the engine still running well and smoothly ?
Going back to your finding diesel in the sump? #4. How much ? #5 any water ?
diesel in the sump is the result of a broken compression ring on a piston,
and because the diesel/air mixture is ignited in a diesel engine by very high compression (no spark as in a gasoline engine) unburnt diesel is forced down into the sump past the broken compression ring. Also diesel will be found in the sump when the engine's cylinders become worn -- but this is a much slower process.
To check the above, a diesel mechanic will measure the compression of each cylinder - one by one with a compression tester.
Here is a blown up graphic of your engine HERE
As to returning to Ft. Lauderdale what about ?
Nassau on New Providence; Freeport on Grand Bahama; Marsh Harbour area on Abaco; and George Town on Great Exuma , repair facilities are surely available.