2009 Yamaha F40 Outboard Service Manual, Page 171Get this manual
Vapor separator (disassembly) 9Remove the pin in the direction of the arrow a a A
10Remove the float v, the needle valve w, and the plates and y
Checking the fuel strainer
1Connect the pressure pump to the fuel inlet a2Cover the fuel outlet with rubber plug b, and then apply the specified positive pressureReplace the fuel strainer if the specified pressure cannot be maintained for at least 15 seconds