I believe he is working on a 3hp IHC type M gasoline/kerosene engine. He can confirm that.You might want to mention what tractor you're working on. At least for me that helps a lot. For instance(and from memory) a 10-20 used a valve on the bottom of the starting tank that was piped to a sediment bowl screwed into the kerosene tank and that fed the carb I think. I don't remember a 3 way but I don't own a 10-20 either.