[mike100]

It is kind of dumbed-down and runs even though there is enough vacuum to hold the diaphragms open indefinitely. I guess they assumed a leaky system and provided enough pump oomph to make it work with a minor vacuum seal issue. They also could have used another 1-way check valve, but just decided to keep the pump on until vacuum was no longer needed. it just keeps running when you are at full throttle. I saw the vac gauge needed pulsing the entire duration of full power with the pump so I know this is the case.