I have a PMUP that is used for my auto top off. It's in a 40 gallon roto-mold tank. The problem I'm having is when the tank is full, the water level is higher than the sump since both are in the basement. When the ATO starts, the sump fills like it should, however, when the pump turns off, the water will not fully shut off. It will drip causing the water level in my sump to rise and obviously cause a flood. I think I'm getting some kind of siphon but I'm not sure where I should put a siphon break because I don't want the water to also siphon from the sump into the tank either. I know it would easy to lower the storage tank but I can't easily do that. It's already sitting 5 inches off of the ground.
Any ideas?
Thanks,
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