Nope, didn't take anything off, other than the stock filter.
Yeah, I'm pretty sure it was coming from the vent hose.
The hose was a little wet on the end and smelled like gas, and there was a little bit of gas right below it on the skid plate.
There was no noticeable power loss.
I'm not sure if it was a drip or a stream. It wasn't running when I noticed the gas on the skid plate, and after that, I was worried, so I loaded it up.