How to remove powersteering lines from 2006 gmc c5500 with 6.6

You mean the brake line flare nuts on the end of the lines? I see nothing that looks like a 'plug'. You buy the lines ready made or you have them made a garage, using a brake line flare tool set. eBay sells them ready made.

https://www.google.com/search?q=2006+gmc+canyon+rear+brake+line+plug+from+master+cylinder

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I would install a reman pump,never try & remove a pully
The pump wasn't the problem

Your problem is most likely that the crank damper has
worn & moved. The rubber in it is the issue & it is hard
to see any misalignment

remove belt and clean all groved pullys

1. remove the powersteering belt.
2. Use a puller to remove the pulley.
3. remove the powersteering lines, theres a preasure line and a return hose
4. remove the three bolts holding the pump to the bracket,
5. reverse directions to install new pump. hope this helps.

Power steering is electric

It likely has hydroboost brakes. This is controlled by the powersteering pump. Sounds like the power steering pump is bad.

YOU HAVE TO MOVE POWERSTEERING PUMP OUT OF THE WAY.SET IT ASIDE.YOU DONT HAVE TO DISCONNECT THE POWERSTEERING LINES.

GM started using electric power steering on some of the small cars, I believe the power steering is electric, for the fuse box for possible blown fuses.

you could have a hose that has a kink in it.or maybe trash in the line from filling the tank.take the hoses off and check to see if there is a blockage.this may help.

put a jack under the engine remove the motor mount and jack the motor up a few inches, you should be able to pop threw somewhere