Bike runs, but not with vacuum hosed attached to gas tank.

[EMPbarker]

Hi.

I have been working on my gz for several days now. I adjusted the valves, they seem okay, a little noisy, but otherwise fine.
The bike had a hard time starting.
It starts though. I just drove it around the block a minute ago.

Number one: The problem, is that I ran it without the vacuum hose attached to the tank. The bike was only running off the fuel in the float bowl. If I hook up the vacuum line, it kills the bike, almost immediately. Like, bang - dead. And won't start.

Number two: Let's say i have the air filter out, and I turn on the primer on the petcock, in a few seconds, gas will start to flow slowly into the air box. Should this happen? Should not the floats in the float bowl turn off the input of gas?

I'm really at the end of my rope here.
School starts after this week, so If I don't get it fixed, I'm screwed, and riding the bus.

Looking forward to your reply.