Before you start building the pump its own little quiet house.
Look up water pumps. There are "2" different ones to choose from. One is cheap and one is expensive.
I had a water pump start leaking all over the place while on the road. Called the RV mobile repair and he brought one out with him and installed it.
It was LOUD. I never heard the factory installed one. Called him back. Apparently my MH came with the more expensive one and he replaced it with the standard cheaper model that he said is more often installed on MH's.
I checked and sure enough. Same functions but one is more expensive and apparently is quieter and I think it might have a higher GPM.
All I know is the replacement pump is loud, rattles the pipes and sucks compared to the original installed one.