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It does sound like you are only pulling a vacuum on the gauges. To get a vacuum in under a minute it just not right. Yes you have to open the valves. Open both the high and low valves and suck it down from both sides. My pump takes several long minutes to get down close to -30.
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Glen
50 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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