Pump not holding prime

[Poconos]

Maybe. On an AG with the pump and filter below the skimmer and return openings you can get backflow from the return, back through the filter, then to the pump so closing just the skimmer valve shouldn't really stop anything. I'd leave the valve(s) open and just look for a dribble.
Gonna go mow...rain approaching sooner than expected.
Al

[AnnaK]

I have the valve to the return closed as well.

Right now the cinder block pad the pump sits on is wet from the pot overflowing. I wouldn't be able to really tell a leak in the pot or its immediate fittings unless there is, as you say, a dribble. And what with the rain coming this plumbing leak detection event may have to be on hold for a few days.

What I do know is there's no evidence of water at any of the valves or connections to/from the pool nor any visible leaks in the pump fittings.

[CarlD]

If it runs and you get no extra air in the pump skimmer

[AnnaK]

Okay, this is where we're at now:

Around noon today I made sure the pot was full and then opened both valves, suction side and pressure side, but left the pump off. When I checked it around 16:00 the pot was half empty. There's no evidence of a water leak.

I filled it, sealed it, turned the pump on low. What I saw were many air bubbles, a lot of action in the pot, and a gurgling sound coming from the filter that I hadn't heard before.

There is plenty of water in the pool, halfway up the skimmer opening. I decided to backwash. Dropped the water hose in to add water. Removed the weir—it seems to impede water flow when the pump runs on high and that's the backwash setting.

Turned the pump on high. The pot filled itself to its total maximum with just the smallest air bubble under the top of the domed lid. I ran it through two backwash and rinse cycles, then set the pump back to low.

As of now, the pot is still full, the pump is on and there's no gurgling in the filter. I'm wondering whether the weir door gets stuck and doesn't let enough water into the skimmer? I left it off for now.

Such drama!

[polyvue]

Okay, this is where we're at now:

Around noon today I made sure the pot was full and then opened both valves, suction side and pressure side, but left the pump off. When I checked it around 16:00 the pot was half empty. There's no evidence of a water leak.

I filled it, sealed it, turned the pump on low. What I saw were many air bubbles, a lot of action in the pot, and a gurgling sound coming from the filter that I hadn't heard before.

There is plenty of water in the pool, halfway up the skimmer opening. I decided to backwash. Dropped the water hose in to add water. Removed the weir—it seems to impede water flow when the pump runs on high and that's the backwash setting.

Turned the pump on high. The pot filled itself to its total maximum with just the smallest air bubble under the top of the domed lid. I ran it through two backwash and rinse cycles, then set the pump back to low.

As of now, the pot is still full, the pump is on and there's no gurgling in the filter. I'm wondering whether the weir door gets stuck and doesn't let enough water into the skimmer? I left it off for now.

Such drama!

Anna, Could this just be a loose fitting or leaky valve? I can effect the same symptoms you describe (when the pump is off) just by opening the top mounted filter gauge a teensy weensy bit -- just enough so that there is no hissing whatsoever -- or opening the pump pot lid a 1/4 turn.

No noise, but over an hour or two gravity works on the water in my above grade filter and drains back through the system (into the pool, presumably) - a tiny leak in a hose or PVC pipe might serve to do the same thing.

[CarlD]

I find I sometimes have to shut down the skimmer a little. I have a ball-valve/quick connect just under my skimmer so I can shut it down just a little so it doesn't suck itself dry and pull in air. The weir is only a problem if it's the wrong one or is worn out or broken.

[Poconos]

Anna has an AG pool so the filter and pump are below water level I assume. Am I right on this Anna? Opening anything on the equipment will let water leak out.
Al