Secondary vacuum pump test

[kieranod1]

Hi guys, my 91' was running rough so I got so I got Marc's plenum video a new set of seals and gaskets from Jerry and started in. My vacuum pump was running continuously so I figured it was a leak under the plenum and while I was there I'd clean her up and do some preventative maintenance. I started at the vacuum reservoir and worked my way to the pump. I put my finger over the port that goes to the reservoir and nothing, pump keeps running. When I put my finger over the bottom of the "L" shaped port that runs to the top of the pump, she stops. Any ideas? Thanks