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Check your COM wire too if running to a ground also maybe tighten or loosen up solenoid or plunger and remove and clean and pu t back. Could be a physical barrier as well like a debris or dirt build up keeping it from shutting off once on.

Stop your pump keep your prime. Turn control unit to off. and let it drain down to the pump or the leak and let gravity do its thing unless you already know the manufacturer. Go to Menards or order a replacement valve. Looks like someone loosened it to the point of leaking or the valve's head...