CheezyArmpit

It's an accumulator with a rubber membrane. Air on one side, water on the other. If water comes out when you depress the pin on the air valve, the membrane is split. The problem was present before and after I pumped the accumulator up, so I think you're right -- likely unrelated. The original pump was leaky around the filter, which is why I replaced it. There was a lot of water under the floors! The chipboard underneath the pump was absolutely sodden. I don't think that's the issue -- I get a decent run time on the taps when the pump is shut off. The pump continues to run some time after the taps are shut off too.

Hi There, I have an annoying problem with my water pressure pump. After pressurising the system the pump turns off as expected. Every 60 seconds or so there is then a thud from the pump, this persists indefinitely. I have replaced the pump and all inlet pipework and the problem persists. This is a fairly recent issue that has appeared in the last few months. Boat is about 11 years old. There is an accumulator tank fitted straight after the pump. I bled the valve for a second or two and there was no water coming out when the system was pressurised. I added a few pumps of air with a hand pump to account for any losses over the years. I don't see how this can be a leak on the discharge side as that would imply that the pump is pressurising from 10 to 25 psi each thud which is definitely less than a second long. Any ideas? Thuds right at the end of the video. https://drive.google.com/file/d/1AE4WXjhMttx3WvqnTrzIcb6pl4eTNd4Z/view?usp=drivesdk