The vacuum pump should cycle on and off making that noise. If it doesn’t turn off for at least a few seconds you have a vacuum leak in the Secondary circuit.
As mentioned do a search on “No start”, not uncommon. Also check the stickies under the “Solutions” thread. Lots of good info. It’s most likely the starter solenoid contacts. There is also a mod to add a relay on 90’s to help that situation.
H
