When not hooked up to an external supply, fresh water must be pumped from the on-board RV water tank using an RV water pump. When the power is switched on, the pump works automatically whenever a faucet is turned on. It’s normal for the pump to pulsate.
The water pump is preset to keep a more-or-less constant water pressure. When the pump senses a drop in pressure, because you’re using water, it runs long enough to restore the pressure and then shuts off. Depending on the demand for water that pressure can be restored rapidly causing the pulsing.
You can install a device called an accumulator tank that will minimize the pulsating. There RV water pumps models available that claim to eliminate the pulsation and noise… ask your RV tech.
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