2003-2004 GP1300R WaveRunner Service Manual, Page 70Get this manual
FUEL FUEL TANK AND FUEL PUMP MODULECheck valve inspection 1Check: Check valve Faulty Replace
Checking steps: Connect hose to end "A" of the check valve, and then blow into the hoseAir should come out from end "B Connect the hose to end "B" of the check valve, and then blow into the hoseAir should not come out from end "A Fuel pump filter inspection 1Check: Fuel pump filter Clogcontaminants Wash the fuel pump filter in kerosene or gasoline