1991 Yamaha Outboard Factory Service Manual 9.9 and 15 HP, Page 34Get this manual
CARBURETIONDescription
The carburetor is single barrel, float feed type with manual choke and is integrated with the fuel pumpThe throttle opening is changed by the cam attached to the magneto baseThe throttle valve is interlocked with the spark advancer1Check valve (inlet) 2Check valve (outlet)
Secure the fuel filter with the nut and push the fuel hoses in until they stopFit the clips in the recesses in the fuel filter