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Paul Workman · 10-14-2021

Sounds good to me! As long as it runs when you open the vacuum line and then when you reconnect it, the pump shuts off after a few seconds...is how it is suppose to operate.

Ordinarily there is a little seepage of air around the various check valves and rubber connections so that the system looses vacuum after a while and the pump will run, periodically, to restore vacuum (with the motor OFF with the ignition switch in RUN). The less leakage of air, the less the pump will have to cycle. But, when the pump runs continuously (or more often cycling in less than every 10 or 15 seconds) then the system needs to be investigated for excessive leak(s).

10-14-2021	#2
Paul Workman Join Date: Nov 2007 Location: Squires (near Ava MO in the Mark Twain N'tl Forest) - Missouri Posts: 6,466	Re: Odd vacuum pump activity Sounds good to me! As long as it runs when you open the vacuum line and then when you reconnect it, the pump shuts off after a few seconds...is how it is suppose to operate. Ordinarily there is a little seepage of air around the various check valves and rubber connections so that the system looses vacuum after a while and the pump will run, periodically, to restore vacuum (with the motor OFF with the ignition switch in RUN). The less leakage of air, the less the pump will have to cycle. But, when the pump runs continuously (or more often cycling in less than every 10 or 15 seconds) then the system needs to be investigated for excessive leak(s).