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Try Slowing the Pump Speed Down..
Or lower the Vacuum to 10 or 9 in..
But If it was not a week pump. It might not have enough oil to cover the system or the wrong size inlet to the pump are possible...




Shouldn't have to slow the vac pump down.... you need 14 to 16 inches to make it worth while..if the oil pump is up to the task... make sure the catch can is not filling up...could be the wrong place to draw from. I draw from both sides... splitting the pressure but keeping the volume the same..