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Old 09-04-2021, 09:30 AM   #1
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Water pump wonít shut off

I have checked all faucets in bath, kitchen and lower bay for possible leaks and saw nothing. When off of city water pump works fine but continues to slowly prime at a slower rate than when water is on. Any suggestions, air in line somewhere and where would I bleed that? Thanks
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Old 09-04-2021, 09:40 AM   #2
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The first thing I would check would be the valve that switches from city water to tank fill. I just had to replace the internals of mine due to the rubber washer getting hard.
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Old 09-04-2021, 10:01 AM   #3
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When connected to city water the pump should not run unless city water is lower then pump start set point

Pump pressure switch controls pump start/stop

W/O city water connected pump running and no demand means 'leak' or pump pressure switch is not opening

Does pump run & run or does it cycle on/off?
Run & run.....that means pump is not fully pressurizing the system
*Fill valve if you have one ---leaking thru
*Bad Pressure switch

Cycles on/off
*city water check valve leaking 00water dripping from connection
*pump check valve leaking...backflow thru pump
*water heater T&P Relief Valve weeping
*Any connection/fitting leaking...place some TP on/around/nar fittings/tees/toilet water inlet etc and check later for dampness
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Old 09-10-2021, 05:45 PM   #4
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Be sure your fresh water tank isnít low. That will cause the pump to run continuously.
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Old 09-10-2021, 05:54 PM   #5
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My problem was the pump when I never found a leak I changed it and fixed problem.
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Old 09-11-2021, 07:43 AM   #6
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When that happened to us, it was the O rings that had died.
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Old 09-11-2021, 09:13 AM   #7
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Lots of good advice above!

There may be an anti-freeze siphon tube and valve. If set to suck anti-freeze it will only get air and not pressurize.
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