Well, the most important thing to do first is look on the left side of the keyboard at the object marked {caps-lock}. Press that. Ok, good. Now....
The evap can is hooked to your intake, as well as the fuel tank way up high. If you overfill the tank (keep clicking a few more drops in after the auto shutoff hits) you'll eventually flood the canister. Normally you just get a BIT in there, and the engine can suck it back out when it runs (what it's supposed to do!). It's really meant to suck up the vapors though.
Anyhow - if it's REALLY pissing out - pull the line going to the tank off, and see if it's still coming out (uhh, put a pan under it first!). Your evap can is now toast anyhow, so you can just get a new one if you like, or drain that one out and stick it back in if you don't have tight emission laws where you are.
Check for vacuum at the canister (with the engine running) to make sure it'll at least TRY to do it's job.
Now just don't overfill it anymore.... and leave the magic {caps-lock} key alone.
