My Springdale TT had noisy pump. After reading several threads on these forums, I decided to take the advise so many offered, and that was to put some kind of rubber under the pump.
After searching, I finally came up with a solution.
I purchased a rubberized household front door mat from Wall Mart and cut a piece of it out that the pump could rest on.
I simply unscrewed the pump from the floor, put the mat under the pump and screwed it back down, but did not tighten the screws. I left them loose, so the pump rested on the mat, but the screws held it from moving when traveling. This quieted the pump noise WAY down, but wasn't perfect. I lived with the noise for another 6 years before we traded campers for our current one.
Another trick is to put insulation (or swimming noodles ... cut them to size) over the pipes where they go through the walls and floors. This will also help eliminate the noise.
The pump itself is really not all that noisy. But, it causes vibration, and what you are hearing is the vibration of the pump being amplified through the pipes touching the walls and floors of your camper and radiating out like the speaker on your television. If you cushion the places where the pipes touch something, this will eliminate a good portion of the noise. Swapping out the pump will not help. You'll still have the same noise and be out the money. (but you would have a secondary back-up pump if it ever failed.... trying to think positive here you know!)
Oh ... what did I do with the rest of that mat? Well, I do a lot of wood woorking and I found the rest of that mat was great for making soft cushions for wood pieces once they were sanded down. It kept them from getting new scars or scratches. And it made a great friction mat, wood did not move when sanding when laying on top of it. So it worked great in my wood shop. Every inch of that mat was put too good use.
