There's one more thing to add to Denny's comment... Is the nut on the outside of the sump? I have seen installs where they put the nut in the sump which makes re tightening almost impossible.
If the bulkhead is the threaded type they can get cracked from over tightening the male adapters into the bulkhead. You won't see the crack until you tighten in a male adapter and it spreads the bulkhead apart.
Cheers,
Tim
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