Hi, I need help to answer a puzzling question. I was rebuilding an old snapper 4216 with a 16hp vanguard engine. I was able to get the carbs clean out and engine started. The puzzling question is: On the Vanguard 16hp caburetor, there are two connections for fuel. One is the 1/4" regular fuel line going into the carb, and another fuel line that is 1/8" going in or out? And where does it connection to? Thank you for your help.. Tommy