The priming pot is still working, but it is letting air in, so the pump isn't pumping as much water. I couldn't find a lid that would work, so I just ordered a new priming pot today. It has threaded fittings, so it shouldn't be that hard to swap out.
The priming pot came a while ago, and I tried using the lid from the new priming pot on the old one, but it didn't fit, so I just swapped the entire priming pot. It was easy since it had union fittings.