bguad- I like to have the fuel nipple pointing down. There is less of a chance that the fuel line would slip of the nipple since it is straight to carb instead of curved. All you have to do is loosen the high speed needle assembly (the brass part on the carb) with either a small wrench or set of pliers, place the fuel nipple in the position desired and re-tighten the high speed needle assembly. Do not over tighten it because it could cause an air leak. Snug is just fine.