Here are two pics, not the best quality but the camera is somewhere and all I have on hand this late is my Blackberry. The Blue arrow is pointing to the mystery nipple, the red arrow and circle is obviously the fuel inlet for the carb, which has a line on it.... The engine will not pull fuel without it attached to the vent line [&:]..... I actually had to squirt some fuel into the carb and use a syringe to get some fuel into the line so that it would start up and start pulling. The little elbow where the carb line nipple is was really blocked [:'(], I had to attach a small piece of fuel line and use a syringe to push fuel through the elbow(see diagram)to clear the blockage... I really had to push hard to clear the blockage, I may need to clean it out more, any tips???[&:] maybe take it off and clean it, it works fine now and the engine isnt starving for fuel, and there is a really good new filter on the fuel line.... works good now