Answer:
I am a fire's best friend. When fat, my body fills with wind. When pushed to thin, through my nose I blow. Then you can watch the embers glow.
What has two hands, a round face, always runs, but stays in place?
Hoofed frolicking.
It is weightless, you can see it. If you put it in a barrel it will make it lighter?
A kind of weather that comes your way, but add a "D" and it will run away
I am the fountain from which no one can drink. For many I am considered a necessary link. Like gold to all I am sought for, but my continued death brings wealth for all to want more.