Water pumps (ShurFlo, Flojet, and others) all run very, very quiet. If you could take the pump out of the camper and run it, you'd barely be able to hear it run. I know, I've done this.
The problem is the vibration resonating through the pipes in your camper, vibrating magnifies as it goes through the pipes and the sound could be heard, sometimes in the opposite end of the camper.
In my fifth wheel, the water pump is located in the front of the camper. But the pipes vibrate in the bathroom and sound like the pump is actually under the shower. I never hear it run up front, only in the bathroom.
If you can isolate the pump from the water pipes, it would be very quiet. One of the best solutions I've seen was to add flexible rubber hose between the water pump outlet to the section of pipe that originally connected to the output side of the pump. The rubber based pipe absorbed the vibrations from the pump and never reached the hard PEX pipe.
Add a spongie cushion under the pump to isolate it from the floor and your's will be quiet also.
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2019 Montana High Country 375FL
2014 Chevy Duramax HD 6.6 - 3500 Diesel Dully Long bed Crew Cab
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