Yamaha F150 Service Manual Page 70

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FUEL
Fuel system
4-7
63P3F11
Checking the fuel pumps
1. Place a drain pan under the fuel hose
connections, and then disconnect the
fuel hoses from the fuel pumps.
2. Connect the special service tool to the
fuel pump inlet.
3. Cover the fuel pump outlet with a finger,
and then apply the specified positive
pressure. Check that there is no air leak-
age.
4. Apply the specified negative pressure
and check that there is no air leakage.
5. Connect the special service tool to the
fuel pump outlet.
6. Apply the specified positive pressure and
check that there is no air leakage. Disas-
semble the fuel pump if necessary.
NOTE:
Assemble the fuel pump valve to the fuel
pump body, and moisten the inside of the fuel
pump with gasoline to ensure a good seal.
Disassembling a fuel pump
1. Disassemble the fuel pump as shown.
Vacuum/pressure pump gauge set:
90890-06756
Specified pressure:
50 kPa (0.5 kgf/cm
2
, 7.3 psi)
Specified pressure:
30 kPa (0.3 kgf/cm
2
, 4.4 psi)
S63P4090
S63P4100
Specified pressure:
50 kPa (0.5 kgf/cm
2
, 7.3 psi)
S63P4110
S60C4060
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