There are questions that remain when I read this.

1) If you pulled off the main vacuum line to the booster and you replaced it with a "direct setup", please describe, in detail, what a "direct setup" is. The main line has a proper fitting at the booster end and it does not leak. I'd be very suspicious of a "direct setup" and question why you did this??

2) If the vacuum shutoff is not functioning, you need to find and correct the vacuum leak that causes the ignition switch to go without vacuum.


When you properly correct the original cause of no vacuum to the shutoff, I'm confident that the booster will function properly.

If you are positive that the booster is getting vacuum (which I am not), then put a T in the line to the booster and monitor a vacuum gauge in the setup and report back.