Adjusting Vacuum Pressure – AG5B Home › Forums › Maintenance of Grummans › Engine › Adjusting Vacuum Pressure – AG5B Tagged: AG5B, vacuum adjustment, vacuum regulator This topic has 0 replies, 1 voice, and was last updated 8 years, 2 months ago by Jared Brank. Viewing 0 reply threads Author Posts March 4, 2016 at 00:14 #3900 Jared BrankParticipant It’s Texas and its warming up so the suction is a little low. Thanks! Jared AG5B Vacuum This pdf shows the instructions from the AG5B maintenance manual provided for me by Roscoe. Author Posts Viewing 0 reply threads You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In