Why doesn't it shut off?
Your well could be dry, your screen could be clogged, you could have a major suction leak, your press switch could be bad, or your impeller could be broke.
If you are getting water, I'd say that your press switch is faulty.
Need drain plug for 2 hp Utilitech pump
If it is just the plug to close a hole, a standard pipe plug from a hardware store will fit. Measure the hole and ask the store clerk to help. They are very inexpensive, so if you get sizes close to your measurement you should be able to get the right one. Be sure not to cross thread (put in at a bad angle and use pipe sealing tape).
Once the water is shut off the pump keeps running
the pump is controlled by the storage tanks pressure switch , if it continues to run well after the pressure tank has refilled with water , either the switches manual override has been activated (lever) or its defective or blocked off with mud
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