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There really no such thing as too much vacuum. It is only the atmosphere trying to crush the hoses. That is nothing compared to the pressures the compressor will produce in the other direction.
The vacuum you can pull will be limited to the temperature and the altitude of your location. Wait for a 100 degree day and let the pump run for a long time.
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Glen
49 Year member of the Porsche Club of America
1985 911 Carrera; 2017 Macan
1986 El Camino with Fuel Injected 350 Crate Engine
My Motto: I will never be too old to have a happy childhood!
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