I have a 2000 DRZ400 and while riding the other day in the middle of a hill climb my bike stalled out. When I tried to kick it a bunch of fuel was released from the tubes under the bike. I "burped" the gas tank by realeasing the cap and a bunch of pressure had collected. I have never had this problem before. It was very hot outside and my bike was hot but I am not sure if this had anything to do with the stalling. Has anyone had or heard of this problem? What causes this and what can I do about it?