I have a 1993 600SL that was runng fine until one day when I was washing it. I left it idling while I hosed it off. I did not wash the engine. When I got back in the oil pressure had dropped from normal to almost zero in about 5 minutes. After I shut it off it would not restart. The engine was flooded with gasoline to the extent that the engine had lost compression from the oil being washed from the cylinder walls and the oil in the crankcase had had been diluted.

Adding oil to the cylinders brought the compression back and it tests normal. After changing the oil the engine and attempting to restrt the engine imediately flooded with gasoline again.

What would be the most likely cause?