Vacuum is low, not gone all together, or the brake booster wouldn't work either.

That pump vents into the crankcase, so you will only be burning excess oil if it's really blowing hard enough to physically overwhelm the oil separator in the air filter housing.

Peter

__________________
1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!