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GH85Carrera GH85Carrera is online now
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Join Date: Nov 2007
Location: Oklahoma
Posts: 55,728
I used to have problems with too high on the high side pressures. I really think it was down to the moisture that would freeze into ice in the vacuum and take forever to sublimate. I finally spent a little money and bought a small nitrogen bottle and the regulator and purge the system with nitrogen.

I pull a one hour vacuum, fill the system with 150 PSI nitrogen, pull another vacuum, purge with dry nitrogen to 150 PSI and look close for any leaks with soapy water. Then a 2 hour vacuum. I never remove any hoses during that. I have a four connector gauge manifold, and I have the vacuum pump connected at all times.

After jumping through hoops and spending about 100 bucks as I remember for the nitrogen setup, no more weird pressure issues for me. It is the total overkill method.
43 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!
Old 07-01-2019, 07:35 AM
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