2008 Yamaha WaveRunner FX SHO / FX Cruiser SHO Service Manual, Page 118Get this manual
Fuel tank, fuel pump module, and fuel hose
Rollover valve check
1Check: Rollover valve Does not function properly Replace the rollover valveChecking steps: 1Blow into the end of the rollover valve, and make sure that airflow from the end is unrestricted2Blow into the end of the rollover valve, and make sure that air does not come out from the end a