fuel pump quick disconnect fuel lines
 

2002 silverado. Replacing fuel pump. Three fuel line connect to the fuel pump. the two outside lines were easily removed with a tool. The middle line I can not get to release. It is of course different from the other two. How does it release? What is needed here. The keepers for the fuel lnes, that I have removed, can I take them off and put on the new fuel pump. QUick disconnect, my butt.
thanks for your help