Quote:
Originally Posted by engatwork
I had the W124 diesel vacuum pumps in mind. Mechanically they are running anytime the engine is running and it does not matter if it is loaded up or not.
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I am not sure when they went to the Vane type Vac Pump. There was a recent thread that had some info on that. Somewhere in the 1995-1996.
On the Diaphragm type Vacuum Pumps I also think when the hold Vacuum they are not working.
But, I have never had a Diaphragm type Mercedes Vacuum Pump apart or seen a good pic to be sure.
I know it is that way with the old Automotive type diaphragm Fuel/Vacuum Pump combinations back when they had Vacuum powered Windshield Wipers.