Well pump runs non-stop shows zero pressure replace pressure switch no change - still l have pressure on the house.

Just can't figure out why the it is running all the time?

  • Is this a deep well pump submerged in the well, or is it a shallow well pump above ground? – Tyson Apr 26 '18 at 23:06

A typical well installation includes a pressure tank in the circuit. The tank contains a bladder which is inflated while the system is turned off and no water pressure is indicated. You use any inflator device such as a bicycle hand pump or tire pump to load the bladder to the recommended pressure.

When the pump is powered on, it will load the tank with water, compressing the bladder until the internal pressure reaches the cut-off switch setting. Let's say that's 50 psi as a reference level. Also, your cut-in setting should be lower, say 35 psi for this example.

The bladder pressure now matches the cut-off pressure and will continue to apply that level of pressure to the water in the system as it is used. When sufficient water has been used to expand the bladder to the original inflation level, the overall water pressure will drop during use until the cut-in figure is reached.

If your bladder has lost pressure or otherwise failed, you will have the circumstances you've described.

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    Usually a failed tank will cause a rapid on off cycling of the pump and there will be pressure while the pump is running, adding air to the tank may resolve the problem but the pressure switch may require an adjustment, – Ed Beal Apr 26 '18 at 22:42
  • I agree with @EdBeal this doesn’t seem like a bladder problem, normally that would cause short cycling. Pressure switches that have been working shouldn’t need a random tweak either. The thing you always have to ask when a system that previously worked stops work is “what changed?” In this case the first place I’d look is an intake blockage. OP doesn’t tell us tho if it’s a deep well pump below ground or a shallow well pump above ground. – Tyson Apr 26 '18 at 23:05
  • My neighbor's tank bladder had failed and the pump wasn't in very good health, but moved water out of the ground, convincing him to not replace it until he was evicted. It ran constantly, but only because it was providing less flow than pipe capacity. I probably should have added that factor into the answer. – fred_dot_u Apr 26 '18 at 23:52
  • No longer have water, primed pressure tank to 25psi, motor will run and has a rattle noise. Replaced the pressure switch with no change. Pressure gauge stays at zero. What should I do next? – Kevin Norman Apr 27 '18 at 8:22
  • Since you can hear the pump running you have a shallow well and or a jet pump. Sounds like the pump could be the problem. Have you had any hard freezes lately in your area? – Ed Beal Apr 27 '18 at 14:59

Depending on where the well and pump is located, there may be a leak between the pump and the house. Also, the check valve may be defective.

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