Bizarre noise coming from the rear suspension

Hello all and Happy New Year.

 

I was sitting in my garage yesterday and all the sudden the 3.6 legacy started making that noise in the rear suspension area. It lasted maybe about a minute.I have not seen or hear anything like that before. car was driven for about 30 minutes 6-7 hours earlier. Anybody has any idea what that is all about? it sounds like something was "charging"?

 

here is a video:

 

https://sendvid.com/hrqm3yjg?secret=4825a676-a470-403e-8813-5ca2450b0527

A whirring noise might indicate a bad wheel bearing. Handle the spokes of the wheel and try to rock it top-bottom/side-to-side - is there any play?

Sounded like the Fuel pump? I know during down times it will pressurize the system, at least that is what I have been told

2018 Legacy/Outback Owners Manual, page 9.

From 2019 manual:

 

Noise from under the vehicle

NOTE

You may hear a noise from under the

vehicle approximately 5 to 10 hours

after the engine is turned off. However,

this does not indicate a malfunction.

This noise is caused by the operation of

the fuel evaporation leakage checking

system and the operation is normal.

The noise will stop after approximately

15 minutes.

A whirring noise might indicate a bad wheel bearing. Handle the spokes of the wheel and try to rock it top-bottom/side-to-side - is there any play?

 

Must be one badass wheel bearing that can make noise sitting in the garage.

 

The issue has been asked a thousand times if it's been asked once. Answered above by ammcinnis.

Happy New Year to you also.