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I am experiencing a leak under my well's pressure switch. This is occurring at the site of the copper stalk and the PVC after the tank T. What do I use to reveal this join?

Reseal this joint?

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I use paper towels stratigicly placed to find the actual leak. It may be a bad solder joint, or it may be a bad PVC joint, depending of the actual source. You may need to "start" over, with new materials and connection methods.

Posted on Apr 27, 2015

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The air is coming out of the pressure switch but the problem is the tank check valve. The tank check valve is on the tank where the large line from the pump feeds into the tank. There is also a smaller line, either plastic or copper, from the check valve to the pressure switch. When the pump shuts off the check valve is supposed to close and the pressure switch opens a valve that lets the head pressure bleed off through the small line. This lets the motor start the next time without any pressure in the head. If the check valve isn't closing properly the air will leak out as you describe.

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This is usually indicative of a broken tank check valve. It's a valve on the pressure line from the pump to the tank. It let's air into the tank then closes so the pressure switch can bleed the air out of the pressure line and head through a plastic or copper line so the motor can restart when the pressure drops. Rarely you can remove the valve and clean the seat and valve but more often than not it has to be replaced.

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Sounds like you have a tank check valve leaking. It is located in top of the tank. The copper discharge line from the compressor goes into the check valve. Make sure there is no air pressure in the tank. Then Remove the large copper discharge line. Also remove the small copper line from the side of the check valve. Once the lines are removed you can remove the check valve. Most of the time the check valve needs replacing. Sometimes they have large pieces of trash holding them open.

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After moving across the country, the compressor never shuts off when plugged in. there is a hissing under the switch at a pin hole below the pressure switch. Also once the compressor reaches 70-70psi. the...


The pinhole leak is most likely your problem. However pressure switch leaks are often misdiagnosed.

Drain all the air from your tank.

Follow the 1/4" copper or plastic line that connects to the pressure switch back to where it meets a fitting that screws into the tank.

Take the lines off of that fitting and take the fitting out of the tank. That is your check valve. Be sure that isn't leaking or obstructed in anyway.

If it isn't leaking or obstructed I think you need to replace your pressure switch. Without having hands on access to your unit I can't be sure.

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When the Pressure switch shuts off, the little air valve in the pressure switch vents the copper line from the compressor, to blead the pressure from the compressor so it's easier to start the next time. If it continues to leak, the check valve between compressor and tank must not be holding.

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