So, I waited until it was a balmy -2 degrees out on Saturday to finally replace my fuel gauge sensing unit. I used the "kit" part # that has been discribed in a previous thread and purchased the kit through GMpartsdirect.com for about 26 bucks. As stated in the thread you only use the part that has the new fingers on it. The first thing I did was purge the fuel to relieve the presure. To do this you need to remove the engine cover and then unsrew the cap that covers the fuel pressure relief valve. I placed towels under the fuel rail to catch the fuel as it ran out. I then used a phillips screw driver to depress the nipple and had a rag covering that do direct the fuel into it and onto the towels placed under it.
Next I crawled in the trunk and pulled the trunk matting out, removed the cover to gain access to the fuel pump. I taped the mettle ring that holds the pump in place, then once it was free, I removed the pump assembly. This thig is about a foot and a half long! And, it is full of gas, make sure you have a lot of towels to soak up all the gas. Also make sure you blow out the area really well so no debris falls into the tank.
To remove the old wiper you simply get a socket that is a bit bigger than the brass retainer and give it a good tap. This removes the wiper from the unit. Now use the new wiper and press the brass retainer back into the unit. Done! A few days later I still smell like gas