I have one on my Magic and I get a very small amount of backflow into the carb line, but the majority runs right out the exhaust like normal.

It's SO much more convenient than trying to take off the fuel line each time (like I was doing.).

The guy who did this on the Cap 20L I have, only put in a little 3-way T-type of connection. Floods out the carb every time. I need to upgrade it

Mike