fna sorry for the French. I just went through this myself, separate thread of my own. I broke all of them haha PITA cause I had to remove tank, evap lines and rebuilt it all with new ends.
Honestly, GM put JUNK there. Probably all the other manufacturers do the same thing. If I had more time I'd rebuilt it right with better fittings and adapt the ends on the evap canister.
Blue one isn't too bad. The white one, you have to take a screwdriver or something and slide open those tangs so they'll pass over the raised edge on the male side. Might not hurt to spray with some Armor All to soften up the plastic a tad.
I went to junkyard to find parts to replace my broken quick connects. All the trucks had same issue. Seems this isn't uncommon. Designed to not be rebuilt easily.