Vacuum Pump Problem

[petervankleeck]

1990 #659

Gentlemen,

If I disconnect the first vacuum line connector near the alternator, and put my thumb over the line from the pump closing it off, shouldn't the pump stop running? This pump keeps running when the line is closed with my finger. It does draw some vacuum but not enough to stop the pump?

Any help would be appreciated. My first thought was to purchase another pump but I wanted to check here to see if there was something I was missing.

Thanks!

Peter