RV Water Pump Noise – How to Soothe the Beast!
That jackhammer rattling noise echoing through your RV floorboards whenever someone turns on a tap at 2 AM is a classic RV complaint. The noise comes from two distinct sources: mechanical vibration transferred from the pump motor directly into the floor or cabinet walls, and hydraulic pulsing of rigid PEX water lines slapping against interior wall framing.
Four Fixes for a Quiet Water System
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1. Install a Flexible Pump Silencer Kit
Factory installations often connect rigid PEX tubing directly to the pump inlet and outlet ports. These rigid lines act as sound amplifiers for the motor's pulsing diaphragm. Install a flexible RV water pump silencing kit consisting of two 36-inch flexible braided hoses between the pump ports and your rigid PEX lines to isolate line vibration.
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2. Install an Accumulator Tank
A pressurized RV water pump accumulator tank holds a pre-charged air cushion that dampens pressure surges, eliminates rapid cycling on/off chatter when taps are opened slightly, and provides smooth, constant water flow.
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3. Cushion the Pump Mounting Feet
Ensure the pump mounting screws are not overtightened down to the wood floor, which squashes the factory rubber grommets flat. Unscrew the mounting feet and place a thick piece of high-density foam rubber or vibration dampening pad beneath the pump mounting base.
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4. Cushion Rigid PEX Lines
Inspect PEX tubing where it passes through cabinet walls or floor cutouts. Wrap contacting points with split foam pipe insulation or securing clamps to stop pipe rattling.
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