vj3krx8

My RX8 was smelling like gas one day. I noticed it was leaking slowly under the car so I took out the back seat exposing the cover to enter the fuel pump. When I took it off I noticed there was gas all over the top of the tank. After examining it closely I noticed that it was leaking when I turned on the ignition where you attach the fuel line to the nipple of the fuel pump. I think the little O ring is not on it. I think the previous owner was doing somethnig with the pump and took of the line and didnt put back on the o ring. I went to the dealer and he said i would have to buy the whole fuel line! I wanted to disconnect the line to see if the o ring was there but I dont know how to take it off.

CAN SOMEONE PLEASE TELL ME HOW TO DISCONNECT THE FUEL LINE FROM THE FUEL PUMP? ALSO DOES THAT GREEN CLAMP LOOK BROKEN?
How do you take off the little green clamp?