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Question:

why is a water pump losing pressure?

My water pump is losing pressure slowly even though no water is being used. Your help is appreciated. Thank you.

Answer:

I vote for the check valve in the well drop pipe. The valve and seat are both brass - no rubber seal - so it's bound to always leak somewhat. If the leak has increased recently, it's due to wear beginning to show or a bit of sand caught in it. A little extra on the electric bill is a lot less than the cost of pulling the well to replace the $20.00 valve. Another possibility:Your pressure tank air cushion may have lost air and become partially waterlogged. This will increase the pump operation. It won't run as long but it will run more often. The system pressure will drop faster than normal. Perhaps this is what you perceive as a leak. Ask your well man how to check the air pressure in your particular tank.
If the motor sounds louder than normal. Youll need to check the impeller in the pump. Make sure the shaft seal on the pump is not leaking. You either have a leak, restriction in the system or a bad impeller or failing pump motor.
Water Pump Loses Pressure
There is a leak somewhere. You may not notice it because it is outside or under ground. Or it could be your check valve that is leaking. It is located on the supply line inside the well. The only way to test it for sure is to pull the line.

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