Awritie then. I'm gonna put this in some non-automotive terms you can understand:

You have PIITB of some beyotch. After a while, you are ready to pull out...but it ain't happening. Why? Because her sphincter has clamped down tight around the pead of your hecker and you can't pull it out. Whatchu gonna do? You can't go to work like this. You've gotta get your dick outta there. Go down to Autozone and get yourself one of those little X scissor looking things and find the right combination on it that just fits around the shaft of your pecker. Cinch it down and slide that puppy all the way up and PIITB up to the rim of your little fireman's hat that is being held captive by the spinchter. Work that tool until it is completely inside the spinchter and causes it to spread out and increase its diameter a little bit. If you do it just right, you can pull your pecker out with a resounding POP and not skin up your knuckles too bad on a butt bone or some kind of wierd piercing. It may take several tries to get that little ring of a spinchter to spread but it can be done.

Personally I like the individual little plastic spinchter spreading tools better than the metal X jobs. But that's just a personal preference kind of thing. Slide that puppy onto the fuel rail side of the fitting and push it into the larger ring looking part. The spinchter is a circular spring up inside there that has to be spread a little . When you get that tool in there under the ring and inside of the circular spring, then you have to pull the other end of the fuel line out of the socket part of the coupler.

Viola, y'all!