Rattle Edition #179 - fuel filler tube

[GoBlueHummer]

So recently I started hearing a very annoying metal on metal vibration in the rear. Took me forever to figure out it's the fuel filler tube that is just freely bouncing on the frame. Do I have a strap or something broken that holds it in place or do I just have enough play in the rubber tubing pieces to let it slap around? I'm thinking of getting a little piece of pipe insulation and putting around the tube in that area.

Any thoughts/experiences?