I dont think you can pinch it at all I looked and its like a solid piece of metal with spring loaded 1 way things in it.
Well, I guess I must be doing it wrong then. :WHT:
The fuel line connector I'm referring to is on the driver side fuel rail of the engine. There's a rectangular piece with a yellow (or maybe more orange-ish) clip inside of it. (The clip reminds me of a fold-up saw horse - you'll see if/when you get it out) The clip has four 'prongs' just sticking out of the bottom of the connector - those are what you pinch together (one side for the left hand, the other for the right hand) and push straight up, which will cause the top of the clip to protrude out from the top of the connector just a little bit. Depending on how much engine funk in is there, it might be tight to push out. Once it's out far enough - you can use something small (like a small tipped standard screwdriver or an awl) to gently coax it out (I hate to use the word pry because people get the wrong idea). Once it's out, the fuel line can be removed by simply pulling it towards the driver side of the truck - keeping a couple of shop rags tightly wrapped around the connector to soak up fuel and keep it from blasting everywhere as it de-pressurizes. There are also a couple of O-rings in there to keep track of as well.
That's how I've done mine when I've run fuel injector cleaner through the rail (three times now), and pulled the intake (along with the fuel rail) to change the intake gaskets.
Buy your special tool though, because I probably don't know what I'm talking about.