2009 Yamaha F40 Outboard Service Manual, Page 148Get this manual
Fuel system
Disassembling the fuel filter assembly
1Remove the fuel cup assembly a, the Oring b, the fuel filter element c, and the clamp d
Pressure pump a: (commercially available) Specified positive pressure: 200.0 kPa (2.00 kgfcm2, 29.0 psi) 3Connect the special service tool to the fuel outlet b4Cover the fuel inlet with rubber plug b, and then apply the specified negative pressureReplace the O-ring, the fuel cup assembly, or the fuel filter assembly if the specified pressure cannot be maintained for at least 15 seconds
Checking the fuel filter element