2009 Yamaha F40 Outboard Service Manual, Page 116Get this manual
Electrical system 5Check that the vapor shut-off valve opens and the negative pressure is released when the battery voltage is applied to the vapor shut-off valve terminalsNOTICE: Apply the battery voltage to the vapor shut-off valve terminals for only few seconds
7Check the wiring harness for continuity2 1
Wiring harness continuity: Terminal 1Terminal 26 Terminal 2Terminal 8Connect the engine ECM coupler and the main relay coupler c9Connect the high-pressure fuel pump coupler aPressurevacuum tester a: YB-35956-A Specified negative pressure: 67.0 kPa (0.67 kgfcm2, 9.7 psi) 6Remove the special service tool a7Measure the resistance between the vapor shut-off valve terminalsVapor shut-off valve resistance: 30.034.0 at 20 (68 F) 8Disconnect the engine ECM coupler and the main relay coupler c