I have a pump that won't shut off. I have replaced the pressure switch it still running unless I touch the switch or shut off power to pump. Upon re-powering the pump pressure rises to 40 (20 /40) but keeps running right at 40. How does the water system pressure tank work and how do I tell if mine is working? On island in NH and want to under stand system so I can adjust or fix. By putting on tire pressure gage will I be able to read the tank pressure. Tank states it should be 28psi can I bycicle pump up the pressure to 28 psi? If this maintains pressure will it effect the shutting on off the pump?

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How does the water system pressure tank work?

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See the image I've put up.

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how do I tell if mine is working?

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Pop the air valve on top of the tank, If water comes out you have a ruptured membrane. The tank should be charged at 2 PSI UNDER the cut in point of the control box AFTER the breaker's shut off and a cold water faucet's opened up to bleed off the pressure.

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Tank states it should be 28psi can I bycicle pump up the pressure to 28 psi?

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WRONG! Your tank should be charged at 18 PSI.

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I have a pump that won't shut off. I have replaced the pressure switch it still running unless I touch the switch or shut off power to pump. Upon re-powering the pump pressure rises to 40 (20 /40) but keeps running right at 40.

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Sounds like you have a faulty foot/check valve that's not holding pressure. Replace the check valve and let me know the results. Good luck. Tom

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it still running unless I touch the switch

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That's rather strange. Is your pump above ground or in the well? Why did you replace the switch?