Here's a simple question I haven't been able to get a straight answer to: how much air, if any, is OK in the pump chamber? Mine fills up to just below the level of the suction line. So there's a pretty big air bubble. 3" or 4" high. Water splashes around while it's pumping.
If the answer is "there shouldn't be any", does this always mean the leak is on the suction side? Or could it be on the far side of the pump?
The pump is primed, the filter is filtering, water is flowing OK. There's only the one 1 1/2" hose from the skimmer basket to the pump, and I can't feel any leaks, and it doesn't drip anywhere when I shut off the pump. I haven't tried spraying it with water yet, though. I opened the pump and relubed the O-ring just to be sure there wasn't a leak there; the O-ring looks fine.