Some past experience, we had an Avan Cruisliner which had a noisy water pump, which unfortunatly was located under the bed. So if one of us got up first and made a cuppa the other was woken up by the the noise of the pump under the bed.
I embarkd on a noise reduction process, having worked on Naval vessels when younger, I tried home made vibration isolation mounts. Followed by foam insulation of the hoses and rubber closed cell foam under all the hose clamps, fiittings and brackets.
The outcome was not really worth the effort, it certainly reduced the noise, unfortuantly the pump location was a major part of the problem. The next steps would have been relocation of the pump and possibly a noise insulated box taking care to allow enough air circulation around the pump.
The actual siolution was we sold the Avan and got our Kedron, pumps still noisy but not under our bed.
Good luck with your pump noise isolation project, I will follow your efforts with interest.
Regards
Terry