Yeah, this saved us a few months ago on a day trip. Was out with a few friends and my brother. He was on my Rebel, his first trip out for more then the commute to work. He ended up dumping the bike in some gravel, and after getting the bike back up, it didn't want to start. After several tries to get the bike started, and with the battery almost dead from cranking, I remember about this trick.
I pulled the vent hoses of the carb, drained the bowl, and attached one of the vent hoses to the bottom of the bowl.
Worked flawlessly. After opening the petcock back up, the bike started right back up.
......I'd rather wake up in the middle of nowhere then in any city on earth.
*2014 VN900 Custom (16,200 miles and counting)