Yep, as f00lgee said, 1000mb at idle is normal.......only because the MAP sensor is upstream of the throttle. If the MAP sensor was in the intake plenum where it would normally live on a turbo engine, (downstream of the throttle plate) it would also show vacuum. VAG only use the MAP sensor for boost reference, and the MAF sensor for load.
The low pressure pump varies from 3.5 to 6 bar under normal conditions. If it's stuck on 4 bar permanently, that isn't right. Maybe try replacing the fuel filter as the pressure regulator is built into it. It's not uncommon for that to fail.