Dave,
First pump is pool pump. No detectable leaks. When I turn on the pump there is minimal amount of water in pump. Once it is running for a few seconds, water fills to the top and there are no air bubbles in the pump. However, once I turn it off a little water leaks from under the lid and after awhile air enters the pump.
Pump two is for a waterfall. Same as pump one that when I turn it on there is minimal water in the pump. However, this one takes longer to get it full even when I add water to the pump before turning it on. Once the pump is running there are bubbles in the water in the pump. In addition, I notice the lid slightly elevates, even though it is screwed down completely. I also notice that the gasket bulges out a bit when it is running. When I turn this pump off water shoots out from under the lid for a second. It is strange how the gasket actually bulges out in one place once it is running...I then took off the lid and resat the gasket and it bulged again when I turned it on.
I replaced the gaskets in both pumps on Saturday. I lubed them well before putting them in. This resulted in no change.
Thanks for your help.