Having problems disconnecting fuel line and return fuel line from fuel rails on my 96 lt-1. Have tried both my metal and plastic fuel line disconnect tools, but can't get lines to come apart. Is there a special tool or "trick" to taking apart?

 

If memory serves me correctly, I had push the connection together while inserting the disconnect tool. I seem to remember having a bit of a time getting the line apart too. The good news is they go back together with ease.

 

The disconnect tool is special itself. Is that what you mean? It should look like the second one down on this page.
http://www.mytoolstore.com/kd/kdengi04.html
Other than that, they are a b!tch sometimes and you just have to keep messing with them.

 

Make sure that you relieve pressure off the line too! It makes it a little easier to get those lines to disconnect