After having the renters from hell burn up my pump motor, I have replaced it, along with all o-rings I can find, I still have an air leak. At least I think it is an air leak. The pump basket does not fill up with water. Where the suspected leak is, is where the water flows right out of the pump upward to a diverter valve.

I have put lots of teflon tape here, but still not tight. Water seeps out of there. Would this cause the 'not full' pump basket? It seems to have not enough pressure to get up to the solar panels to heat the water, because it sure is not warm water returning to the pool. Lots of air bubbles coming out of the returns too.