I have a 9 hp tecumseh on a tiller, and it wouldn't run. Took the carb off and it was all junked up. Cleaned it out, put it back on and it started right up....trouble now is that it is dripping gas when not running. The needle valve attached to the float seemed to seat in some sort of spongy white material.....not a brass seat as I've always seen in other carbs. I dug some of the stuff out when I was cleaning the carb, and wondered if this is what is causing my leak. Is that white stuff supposed to be in there? I couldn't seem to get to the bottom of it, so I assumed it was some sort of seating material that tecumseh carbs used????? Thanks in advance for any help.