The following is a general diagram (overhead view) for gas line and vacuum line connections for a carburetor. (carburetor displayed: 3M model) Bottom hose (not shown) on bottom bowl of carburetor also falls downward unconnected and is used to drain the carburetor from excess gas when having trouble starting. *VERUCCI is not responsible for any damages caused by the improper assembly of scooter in any given way by directly or indirectly following these guidelines. These instructions are merely a suggestion for carburetor troubles for a 2-stroke scooter engine such as model 3M. An experienced mechanic is strongly recommended.