After pulling the metal bail/ring off of the frame tube, the only thing holding the tank on, is a piece of rubber at the front of the tank .
If the tank hasn't been off for a while, it's going to take a pretty hard pull to it freed up .
Wiggle the back side of the tank while you're pulling on it .
If the tank is full of fuel, you may want to drain it before removing it, it's a bit on the heavy side when full .
A quick spray of silicone lubricant on the rubber part, will make removal earier next time .
Remove the fuel line from the fuel tap, after you turn the fuel off .