RV owner's field notes · August 25, 2026
Why Does My RV Water Pump Keep Running?
Find the common reasons an RV water pump will not shut off, from a faucet leak to a pressure-switch or suction-side problem.
An RV water pump that keeps running is telling you that pressure is not reaching its shutoff point—or that the pump is losing pressure after it stops. The cause may be a faucet that is not fully closed, a toilet valve, an outside shower, a hidden leak, air on the inlet side, a clogged filter, or a pump that needs adjustment or replacement.
Separate pressure loss from a pump problem
Turn off every faucet and appliance that uses water. If the pump continues to run, listen for where the water or air is moving and check for visible moisture. If the pump cycles periodically after shutting off, pressure may be bleeding down through a leak or a check valve.
| Pump behavior | Possible source | What you can safely note |
|---|---|---|
| Runs continuously with no water use | Open faucet, leak, air leak, clogged inlet, or pressure issue | Check faucets, toilet, outside shower, and visible fittings |
| Shuts off, then cycles every few minutes | Slow leak, check valve, water heater relief, or fixture | Watch the pump frequency and look for damp areas |
| Runs loudly but little water comes out | Empty tank, suction leak, clogged filter, or airlock | Confirm tank level and stop if the pump runs dry |
| Runs after winterization | Bypass, drain valve, fixture, or plumbing setup | Check that valves match the current water-system mode |
| Stops when connected to city water | Pump or pressure-switch issue may be involved | Do not assume the leak is fixed |
Protect the pump and the RV
Do not let a pump run for a long time with an empty tank or a closed water path. Heat and wear can build up, and a small leak can wet a cabinet or floor. If water is visible near an electrical component, turn off the pump and power source when safe.
The pressure-switch adjustment is not a universal fix. A weak pump, cracked inlet fitting, blocked filter, or hidden leak will remain a problem even if the switch is turned. A mobile inspection can follow the plumbing from the pump to the fixtures and water heater.
For a persistent cycling pump in the Nashville area, learn about RV water leak detection and repair.