OIL LEAK

What is your question?

Good after noon, I have tried and tried and in frustration I am here looking for help. I have a 1993 Lincoln Mark 8 with an oil leak. The leak is comming from some where around the oil sending unit. I replaced the oil sending unit and oil filter but to no avail and It only leaks when the car is turned off and parked. As far as I can tell, it is not leaking from the oil pan or the drain plug or the front or rear seals. Can someone please offer a suggestion as to what it could be?? Thank!