Well Pressure Tank Repair
A well system stores its patience in the pressure tank: a captive cushion of air that lets the pump fill a reserve, rest, and start again only when the reserve is spent. When that air disappears, leaked past a fitting or lost through a torn bladder, the cushion is gone, and the pump starts for every glass of water. Short cycling is the sound of a well system that has lost its spring.
Signs You Need This Service
How tank trouble announces itself:
- Short cycling. The pump kicking on and off in quick bursts while water runs: the defining symptom of a cushion that no longer exists.
- Pressure that flutters. Showers swinging strong-weak-strong in rhythm with the pump. The system is riding its switch instead of its reserve.
- The heavy tank. A tank that should ring hollow at the top but thuds full: waterlogged, with air lost and water standing where the cushion belonged.
- Water at the air valve. Moisture escaping the charging valve is a one-second verdict: the bladder has torn, and water has crossed into the air side.
- A pump that never rests. Frequent starts at all hours, even overnight. Cycling wear shortens the most expensive component in the system, which is exactly why tank faults deserve urgency.
Sounds like your problem? Request a quote →
This page covers repairing the well pressure tank and its control bench: switch, gauge, tank tee. It is a different machine from the small thermal expansion tank beside a water heater, which has its own page; and the pump itself, when it is the patient, belongs to the pump repair pages.
Common Causes
What actually goes wrong:
- Lost air precharge. The captive charge seeps out over years. This is the benign, fixable version, restored with a gauge and an air source once the fault is confirmed.
- Ruptured bladder or diaphragm. The membrane separating air from water tears with age; air dissolves into the water and leaves, and no amount of recharging holds. This is the fault that moves the conversation toward replacement.
- Waterlogging. The end state of either fault: a shell full of water with no spring, driving the pump to fire on every draw.
- Switch, gauge and tank tee. The control bench fails too: pitted switch contacts, a clogged switch port, a lying gauge, corrosion at the tee. Small parts producing tank-sized symptoms.
- Mismatched settings. A switch range and a tank charge that no longer agree: the system fighting its own configuration after a part swap somewhere in its past.
How a Plumber Diagnoses the Problem
How the fault is pinned down:
- Watch a full cycle. Cut-in and cut-out observed on the gauge with water running. The pattern separates a cushion problem from a switch problem before anything is opened.
- Weigh the evidence. Top of the tank knocked, valve tested for escaping water: thirty seconds that often names the bladder outright.
- Check the precharge properly. Air charge measured under the conditions the manufacturer specifies and compared against the switch range. The exact target is per system, which is why no universal number appears here.
- Audit the control bench. Switch behavior, gauge honesty and the tee's condition verified. Replacing a tank to cure a clogged switch port is the expensive wrong answer this step prevents.
- Separate tank from pump. Cycling can also come from pump-side and well-side faults; the tank test isolates which side of the system is spending the pump's life.
Frequently Asked Questions
Why is my well pump short-cycling?
Most often because the tank's air cushion is gone (lost charge, torn bladder, or a waterlogged shell), so the pump starts on every draw. A stuck pressure switch or blocked switch port produces a convincing imitation, which is why the diagnosis watches a full cycle before naming the part.
How do I know if the pressure tank is waterlogged?
The tank feels heavy and thuds full where it should ring hollow near the top, pressure swings rapidly, and the pump fires in short bursts. Water escaping the air valve settles it: that is bladder failure, not just lost charge. Each check takes seconds with the system observed properly.
Can a bladder tank be repaired?
The charge can be restored when the bladder is intact; that is genuine repair. A torn bladder or diaphragm cannot be fixed inside the tank on most residential models. At that point recharging only rents time, and the honest conversation moves to the replacement page.
Could the pressure switch be the real problem?
Regularly. Pitted contacts, a clogged sensing port or drifted settings produce cycling and pressure swings with a perfectly healthy tank. The control bench is checked before the tank is condemned; switches and gauges are the cheap half of this system's failures.
How is the air precharge checked?
With an accurate gauge at the tank's charging valve, under the measurement conditions the tank manufacturer specifies, and compared against the pressure switch's range. The right value is system-specific: a set-and-verify task rather than a universal number off the internet.
When should the tank be replaced instead of repaired?
When the bladder has failed, the shell leaks or corrodes, or the tank was never sized for the pump's needs. Restored charge that will not hold is the classic tell. Sizing and the swap itself live on the replacement page, with the switch and tee decisions that ride along.
Stop the Cycling
Describe the pump's rhythm (how often it starts, what the gauge does), plus the tank's age and any water at the air valve. The cycle observation does most of the diagnosis; the visit brings the gauges.
Request a Quote for Well Pressure Tank Repairor call (800) 555-0147Only license-checked plumbers who cover your ZIP receive your request.