I think I figured this out. I was replacing the spark plugs yesterday, and the little brass fitting that the fuel line goes on that comes out of the fuel valve on the gas tank, well it just fell out. I'm guessing it has been loose for quite a while. I tapped it back in by using a hammer with a small piece of wood over it (so I didn't dent it), and that seems to have taken care of it. I think I'll order a new fuel value assembly and replace it, I'm guessing it will come loose again over time.