What to Do if Your RV Water Pump Keeps Running
When your RV’s water pump malfunctions it can be a perplexing situation. One relatively common issue is the water pump keeps running for no apparent reason.
An RV water pump is on-demand, meaning that the pump only pumps water when it’s needed. The on-off mechanism works by pressurizing your water lines; when the proper pressure is reached, it will turn on or off. When you turn the water off, the pump will keep running until the proper water pressure is reached, then the pump automatically shuts off. When you turn on the water, the pump senses a drop in pressure and starts pumping again.
If your water pump keeps running and won’t shut off, it could be caused by a few different issues.
Your RV Has a Switch For “City Water” And “Tank Fill”
If your RV refills the freshwater tank through the city water inlet, try switching the switch from tank fill to city water. Also, check to see if there is a leak in that valve.
You Have a Leak Somewhere In Your Water Lines
RV water pumps should turn on automatically when a faucet is opened. A water leak can trick the pump into thinking a faucet is open and you are using water. Therefore, you’ll need to search for the leak in your water lines and fix it.
The Pressure Switch Has Failed On The Pump
Turn on the water for a few seconds then turn it off. If there is a difference in the pump’s sound or vibration, it could be the pressure switch. If that is the case, you can order a replacement switch. You’ll need to know your pump’s make and model, which should be posted on the body of the pump.
The By-pass Valve Needs To Be Adjusted
The by-pass valve has a spring-loaded diaphragm that opens to allow water to flow from the discharge side back into the inlet side. If the pressure switch or the by-pass valve are misadjusted, the by-pass valve and pressure switch can overlap in function and the pump won’t shut off. If this seems to be the case, you’ll need to readjust the by-pass valve and the pressure switch until the pump stops running.
If none of these solutions solve the issue, it may be time for a new water pump. RV water pumps are relatively inexpensive and easy to replace. Buying a new water pump will cost anywhere from $75 to $150, and it’s easy to do the work yourself with a few simple tools. If you have a repair guy do the work, it should cost you one hour or less of labor.