I posted this in wrong subsection, maybe I'll have some response here
I understand it's a subjective question, but how exactly loud is the high pressure fuel pump supposed to be? Son bought 08 MS3 Hatch, and it's the loudest device under the hood.
They are not cheap, and my concern is - is it sign of it going bad any time soon, or just let it be?
You can hear it well at 2.40 in this vid we shot on cold yesterday: