Art, that idea worked like a charm. I put a t fitting in and a small return line after a check valve that holds the prime in the pump and connected a 1/4" tube from the t up to the tank. A small amount of water flows back into the tank, and when I shut down the pump, the line quickly breaks the siphon - problem solved...now on to the timer switch and to find another 350 gallon tank to sit next to the first one (which I found being thrown out - it was a brine tank for a school water softener and they had let the salt harden into a single 500 lb block, but I was able to get the salt out by cutting it with a pressure washer set to 0 degrees)