I can't get my pump to prime. It will get close and bubbles come out of returns, but then in less than 5 minutes, loses everything. Isolated each skimmer & main drain and in all three cases, with only one source open, same effect. Removed diffuser and visually inspected front of impeller, no rocks or obstructions. Motor sounds fine and creates good suction on basket cover. If I fill basket up to full, it sucks that water out immediately. Resolved small air leak at a trap that I open to blow lines out and it now holds standing water above fitting, so no leak there.
Suspicious of something in motor. Last year, system suddenly ran dry one day near end of season and melted basket. Cleaned out impeller and all seemed good, but not sure if seals, bearings, etc., could have been affected. Replacement motor is $300, but looking for other ideas first.