1. My pump vapor locks anytime the pool goes low of water (expected), but starting it back up is quite the pain.
2. My pool is about 8 feet higher than my pump.
3. prior to vapor lock, if I remove my pump basket lid, water will free flow from the pool to the pump.
4. after vapor lock, it will not flow from pool to pump any longer.
To get my pump to restart after a vapor lock. I have to take a hose, with the black rubber thing that expands when water flows through it, and fill the pool return line with water. I put it in via the pump basket. When I do this I see lots of bubbles comes from the return back into the pool. After all bubbles are gone I can turn off my return valve, to hold the water, put on the pump strainer lid, turn on valve and go. The pump will then work.
What I can't understand is why wouldn't the water just flow downhill through the pipe and push the air in the return out through the pump? It does this when it is full of water. Its almost as if there is a point in my return line that goes higher than the pool level? If this were the case I could understand the issues but my pool is above my pump.
Anyone out there have any idea what could explain my vapor lock issues? I"m not hopefully, but I do like to be surprised
As an aside, my spa returns have the same problem and the spa is a couple feet higher than my pool.