Yes, the outlet is lower than the tank (outlet are at "0" and bottom of tank is at "0", but tank is often full or filling).
Yes, I meant a "T" with a swing check valve downstream of the pump. The T and check valve vented to the air. When the pump is running the check valve would be pushed...
Thanks Q Goest, my idea with the swing check was to allow air into the pipe to "release" the syphon "suction". Before I had tightened the adjustable spring check up pretty good, but it still allowed the whole tank to drain (well, not really, because it kept filling up from the well). But I had...
I have a problem with an above-ground water tank supplying a pump on the ground, supplying a sprinkler system. When the pump turns off, the water doesn't stop due to the syphon effect. When I first installed the pump, I put in an adjustable sprink check valve after the pump, but it still leaked...