How to replace fuel filter

You will need a GM fuel line disconnect tool.

http://www.harborfreight.com/3-piece-quick-disconnect-tool-set-38732.html

You can get a metal version that works as a universal tool at HF.

Have to push tool (Depending on how strong you are may have to push real hard) inside fitting and hold it there while pulling back on line. Similar to push to connect pipe fittings for home water lines.

One side may not be quick dis-connect as some models had just the tank side with it and other was bolted.