2009 Yamaha F40 Outboard Service Manual, Page 164Get this manual
FUEL Draining the fuel
Fuel system
1Drain the remaining gasoline in the vapor separator into drain panLoosen the drain screw a, and then remove the cap bPush in the air valve with screwdriver
Installing the fuel hose clamp
Do not reuse the fuel hose clampAlways replace it with new one1Crimp the fuel hose clamp properly to securely fasten the fuel hose and the quick connector