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22-24 in/hg is what many forum Members say is normal. But, that is with no abnormal leaks.
You might unscrew the Check Valve that is in the Vacuum Pump right where the Main Line attaches and do a visual check and clean it out with some WD-40 and see if cleaning it improves the Vacuum.
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84 300D, 82 Volvo 244Gl Diesel
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