Not to thread jack... but I was wanting to post the exact same topic and am looking for more insight into this problem.

My pools main pump is losing its prime. It was a problem I had a few months ago when first starting the pool up (my first year with the pool/house). But in the last month of two it has held pretty consistently until yesterday. The pump lost its prime almost as soon as it fired up and I caught it pretty fast. Re-primed pretty easily and it ran fine the rest of the night.

I came home today, the pump had been running about 2.5 hrs, and at some point it lost its prime again. The water was steaming hot and the basket was empty... Is there an ideal adjustment on the valves to avoid this problem? I have a skimmer, cleaner, and drain line for inputs. Waterfall and jets as outputs...

I guess I'm totally thread jacking here, I apologize. I can repost a new topic if that would be better..