No water was or had been running when a vibration like a noisy fan motor started but was plumbing vibration in the walls. It stops when any faucet is turned on and draws a quart or more a minute.

[Norman]

Drained the entire system through a garden hose and this did not cure the vibration. Any suggestions?

[Meanie]

[makolber]

you mean you turned off the water main valve and drained the system and still had the noise?

[trader_4]

I would look for a slow leak somewhere, follow the noise. I was awakened one night years ago by a faint buzzing kind of sound. Actually it was so faint, I'm not sure it was what woke me up, but once up I noticed it. I tried to follow it, thought it was inside the house, then checked outside, finally went down to the basement. The water heater had started to leak and the slow release of water was what was causing the pipes to vibrate. Fortunately I caught it while it was just a large puddle, not a flood. So, I'd look for anything that could be drawing water, eg leak, partial open outside faucet, etc.

[ZZyXX]

of course your posts are