Coach WaterPump Replacement Question?

Before replacing I would make sure it's not a mounting problem. Start by removing the screws that hold it down and put some foam/bubble wrap under it. If this helps enough then you might want to try something like this.

Adding some vibration isolation to your existing pump will likely do more for quieting it down than replacing it will. The most effective method is to add a foot or so loop of soft flexible hose with a suitable pressure rating at the entry and exit ports. Adding additional rubber padding under the pump can also help. A couple of layers of old mouse pad material is reported to work well.

You can see the loops on the right of the photo below that I added when I relocated the pump in our Landau from the bedroom to the wet bay. The third larger loop is a suction line for adding antifreeze or filling the water tank from a bucket or other container.

Yes Adding some vibration isolation to your existing pump will likely do more for quieting it down than replacing it will.

Three things you can do to your old pump to help....two are listed above. I like to mount mine on a mouse pad. It's durable, just the right size and is a perfect cushion for the pump. If the PEX tubing (hard plastic plumbing in your coach) is mounted directly to the pump, you need to do what Dutch recommended. The hard plastic line transmit vibration.

If you look under your sink in your home, you most likely have the chrome or white flexible tubing going to your faucets. This same tubing, available at Home Depot and Lowes has the same fittings as your water pump. It's typically a water hose fitting. If you get one of the flexible hoses (about 18") with the same female fitting on both ends, one will thread directly to the pump and you can use a threaded nipple to connect the two other female ends together.

Sometimes you'll get a banging noise (hammering), not necessarily near the pump, but somewhere else in the coach. This is the plastic PEX plumbing moving and hitting against a wall, making noise. You need to hunt this down and strap the plumbing down in that area, or cushion it with some foam.

Lastly, if you want a quieter pump, I've used the Flojet VSP (variable speed pump) for years. It only runs as hard as the amount of water needed. They're very quiet and my last one lasted the years I owned the coach.

If you add a larger, more powerful pump, make sure your wiring is of sufficient size or you'll burn up the new pump. The Shurflo products are susceptible to undersized wiring.

What is currently installed?

PS- Don's the one that turned me on to the Flojet VSP. Its a wonderful thing after my Sureflo was discontinued

Thanks for all of the suggestions! Never thought about figuring a way to make it quieter... just figured it was a cheap pump and the 'nature of the beast'.

I'm now on the lookout for an old mousepad (of course I won't be able to find one now that I am actually LOOKING for one...) Can't wait to give this a try!

Thanks all!

Don't expect a major improvement from just the mouse pad mod. The flexible water lines are usually much more effective.