leaking gas

Hello, My family bought a pair of 2003 trailblazer 250's (they're the blue ones with the yellow decal) and one of them leaks oil from a few places, oil coming off the exhaust and around the engine, i can provide pictures if needed. the other one kind of spatters off fuel when running. both quads...

I have a 1999 polaris sportsman 500 that is leaking gas from the bottom of the carb, from the gas shut off valve and from underneath the air box. I squeezed the gas line with a pair of vise grips so it will stop dripping. Do I need a new needle and seat? What about the other places its leaking...

On my 2005 sportsman 500 HO, there is what appears to be a 1/8" x 14" clear vacuum tube attached to the bottom of the carb bowl. The opposite end is not attached to anything. It is now leaking gas. Any ideas where or to what the tube attaches to.