Waterlogged Pressure Tank Fix

What Is a Waterlogged Pressure Tank?

A waterlogged tank is one where the internal bladder or diaphragm has failed, allowing water to fill the entire tank with no air cushion. Without air, the tank cannot store pressurized water — so the pump must run every time water is used, cycling on and off every few seconds.

How to Test for Waterlogging

1. Turn the pump off at the breaker.
2. Open a faucet to release all system pressure to zero — wait until no water flows.
3. Find the Schrader valve on top of the tank (looks like a tire valve).
4. Press the center pin with a screwdriver or tire gauge.
5. Air comes out = tank may be salvageable. Check pre-charge pressure.
6. Water comes out = bladder has failed. Tank must be replaced.

If Air Comes Out — Check Pre-Charge

Use a tire gauge to check the pre-charge pressure. It should be 2 PSI below your cut-in pressure. For a 30/50 switch: 28 PSI. For a 40/60 switch: 38 PSI. If pressure is low, add air with a bike pump or compressor. Recheck and test the system.

If Water Comes Out — Replace the Tank

A bladder that has failed cannot be repaired. The tank must be replaced. Steps:

1. Turn off pump breaker.
2. Release all pressure through a faucet.
3. Close the shutoff valve between the tank and the house.
4. Unscrew the tank from its fitting using a pipe wrench.
5. Thread on the new tank with Teflon tape.
6. Set pre-charge to 2 PSI below cut-in before reconnecting.
7. Restore power and test.

Frequently Asked Questions

Can a waterlogged tank fix itself?

No. If the bladder has actually ruptured (water coming out the Schrader valve), it will not self-correct — the tank needs replacing. If air still comes out but pressure is low, that's a simple pre-charge top-up, not true waterlogging, and recharging will fix it.

How often does a pressure tank need its air recharged?

A healthy tank with an intact bladder rarely loses air charge — checking once a year during routine maintenance is usually enough. If you find yourself recharging every few months, the bladder is likely failing and heading toward full waterlogging.

Can I keep using a waterlogged tank temporarily?

You can, but the pump will short-cycle constantly while you wait, which is exactly the stress that burns out pump motors and start capacitors early. It's not dangerous to delay a few days, but every day of short-cycling adds real wear to a pump that costs far more to replace than the tank.

What pre-charge pressure should I set on a new tank?

Set it to 2 PSI below your pressure switch's cut-in setting. For a common 30/50 switch, that's 28 PSI; for a 40/60 switch, 38 PSI. Always check this with the tank fully drained of water and disconnected from system pressure for an accurate reading.