1998-2000 Yamaha WaveRunner GP800 Factory Service Manual, Page 49Get this manual
IFUELI _
SERVICE POINTS
Check valve inspection 1Check: Check valve Faulty -7 ReplaceChecking steps: Connect hose to the end of check valve "A" and blow into itAir should come out from end "B" Connect the hose to the end of check valve "B" and blow into itAir should not come out from end "A"Oil filter inspection Refer to "OIL INJECTION SYSTEM" in chapter 3Oil level switch inspection Refer to "INDICATION SYSTEM" in chapter 7Oil tank inspection 1Inspect: Oil tank Cracksdamage