Really? Leaks when you shut off the pump? Maybe that is the problem with mine then, after all. I can't see the plug when I shut off the pump, have to crawl back there and flip the toggle. And there is water on the lip right below the plug . . .

It'd be worth to buy a new plug and put that in than to disassemble all the plumbing and put new Teflon tape and gunk on the threads.

Thanks for posting your experience!