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The nut itself is not sealed. The seal is achieved by the rubber grommet, which is compressed against the tube and pump housing. If the oil is actually dripping from that area, then there is a problem with your pickup tube or the pump housing.
My nut was shortened up in a lathe due to bad threads that would not hook. I tried shimming it out with bushings but it still leaks. Prior to dinging the threads it did not leak.
I did take it apart, clean it and stuff it with RTV once and reassemble it. I let it dry and it slowed the leak but am tired of the drips.
AITKEN MOTOR CO. in Aitken MN has 7 = 218-927-2169.
GREEN SALES CO. in Cincinnati OH has 11 = 800-543-4959.
CARPENTER NOS OBSOLETE PARTS in Concord NC has 19 = 800-476-9653.
------------------------------------------------------------------------------------- B4A-6698-A .. Seal-Oil Pump Inlet Tube / Obsolete
BOWMAN SALES & SERVICE in Bowman ND has 7 = 701-523-3257.
SOEBY MOTOR CO. in Walhalla ND has 11 = 701-549-3711.