Problem solved. I tried the shaving cream detection technique, and found out that my air leak was coming from both of the drain plugs on the pump. When I unscrewed them, only one had a gasket, the other had a small amount of dried up plumbers tape. So I went to the local pool store and bought 2 new gaskets, which looked very different from the one existing gasket, both in color and shape. I've had the new gaskets in place for about 7 hours and have no air in the filter. Thanks for all the help.

Tom