First, turn off all the electronics inside the camper, fill your fresh water tank, unhook from city water, and then turn on the on-board water pump and listen to where the noise is coming from.
Looking at your model on-line, the water pump is probably directly behind your fresh water fill port. Looking at videos of the inside, that would put the pump inside that cabinet beside the bed on the floor. You may have to take some screws out to remove the top of that cabinet, or possibly access inside that cabinet from the pass through. I don't know how yours is put together.
I had a Keystone Springdale and the water pump was in that location. Instead of a cabinet, mine was covered with carpet, which made finding the screws very hard. Once I found the screws, I never put them back in. The top just lifted off that way.
I have a feeling, yours is in the same location.
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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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