2009 Yamaha F40 Outboard Service Manual, Page 151Get this manual
Fuel pump assembly
Removing the fuel pump assembly
Use rag to catch any spilled gasoline when removing the fuel components1Disconnect the fuel hose a2Remove the fuel pump assembly b-100
Specified negative pressure: 30.0 kPa (0.30 kgfcm2, 4.4 psi) 4Connect the special service tool to the fuel pump outlet b5Cover the fuel pump inlet with rubber plug b6Apply the specified positive pressure and check that there is no air leakage
Checking the fuel pump assembly
1Connect the special service tool to the fuel pump inlet a2Cover the fuel pump outlet with rubber plug b, and then apply the specified positive pressureCheck that there is no air leakage0 50