When I did my plenum, I couldn't get the disconnect to work, so I just left my fuel rails intact, and just pulled them straight up to removed the injectors from the intake manifold. I then just zip tied the entire fuel rail assembly out of the way. Had plenty of space to do the plenum job, and didn't have to mess with disconnecting the fuel line. If I ever have to do that again for any reason, i'd do this same thing because it was so easy.
I still removed the fuel relay from the fuse block, and ran the truck till it died before I did any of this so I was certain there wasn't any fuel at the injectors.
Joined: Feb 2003
Reputation: 0 Garage: 4
RE: removing fuel line from fuel rail. 5.9
You need a fuel line disconnect tool.. You have to wiggle it up in the connector and kind of work it around while you tug on the line. It will come off... Sometimes they are kind of stubborn. TOok me about 5 mins yesterday to get one off of a 99.