Yamaha E60HWD Service Manual

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FUEL4-11 69D5G11Fuel systemChecking the fuel pump1. Place a drain pan under the fuel hoseconnections, and then disconnect thefuel hoses from the fuel pump.2. Connect the special service tool to thefuel pump inlet.3. Cover the fuel pump outlet with a finger,and then apply the specified positivepressure. Check that there is not air leak-age.4. Apply the specified negative pressureand check that there is no air leakage.5. Connect the special service tool to thefuel pump outlet.6. Apply the specified positive pressure andcheck that there is no air leakage.Disassemble the fuel pump if necessary.NOTE:Assemble the fuel pump valve to the fuelpump body, and moisten the inside of fuelpump with gasoline to ensure a better seal.Disassembling the fuel pump1. Disassemble the fuel pump.2. Check the diaphragms for tears or dam-age. Replace if necessary.3. Check the valves for bends or damage.Replace if necessary. Also, check the fuelpump body for damage. Replace if nec-essary.4. Clean the fuel pump body.Vacuum/pressure pump gauge set:90890-06756Specified pressure:50 kPa (0.5 kgf/cm 2, 7.3 psi)Specified pressure:30 kPa (0.3 kgf/cm 2, 4.4 psi)Specified pressure:50 kPa (0.5 kgf/cm2 , 7.3 psi)