I have a 16 x 32 inground pool with a self-priming pump. This morning I cleaned out the basket in the pump and replaced the cover as per usual and turned on the pump. The pump will not self-prime/fillup with water and run. I noticed one of the outlets in the pool on the pump end had bubbles coming to the surface. Does this mean there is a air bubble in one of the lines or something else like I need to replace the pump?