My brother's Blaster is leaking gas out of the tube coming off the carb. He took it off and checked the float to see if it was stuck. It seemed ok. He put the carb back on and it still leaked. I won't get a chance to look at it until this weekend, so I can only go by what he has told me on the phone. Any suggestions? Is there an o-ring, seal, or gasket in there that might be letting gas by (like around the needle valve???)? Thanks.