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Buick Regal Oil Sending Unit

Why would my oil sending unit keep leaking/failing on my 2001 Buick Regal

Cheap parts, poor installation, stuck pressure relief, chewing critters…

Take your pick. Given how little info you told me, you are lucky to get that.

I just replaced it not even two weeks ago and now it’s leaking again

This statement doesn’t tell me anything except it is leaking after 2 weeks.

Where did you get this part? Is it the cheapest version? Is it leaking from the threads or through the body? Are you sure it is leaking from the sender? Have you checked the actual oil pressure with a mechanical gauge? How long did the last one last? Where was it leaking?