[billschroeder5842]

You probably need to check the whole system for leasks as it it not holding a vacuum. The pump runs until vacuum is acheived then intermittantly to maintain. A constant running leads me to belive that you have a leak some where. Ylou may have to get under the plenum.

I'd first disconnect the line at the fitting on the outside of the engine and run the pump, with your thumb over the hose. If the vacuum increases on your thumb and the motor shuts down, then you have a leak under your plenum. If conversely, the pump continues to run, you have a leak "out side" your motor and probably around the secondary vacuum pump. There are rubber hoses on the pump that could be cracked and leaky.