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1938 Oldsmobile Fuel/Vacuum Pump Vacuum Pressure Specs

Guest madmoose

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Guest madmoose

I have a type AJ combination fuel/vacuum pump for my 1938 F-38 Olds. I have numuerous manuals with every detail and schematic on how to rebuild every pump imaginable, including mine. However, there is one specification that I can't find anywhere: What is the proper amount of vacuum I should be measuring on the wiper side of the vacuum pump? Does any body have or know what the correct measurement should be on a standard vacuum gauge?


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