Checking The Fuel Pumps; Disassembling A Fuel Pump - Yamaha F150A Service Manual

FUEL

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.
Vacuum/pressure pump gauge set:
90890-06756
Specified pressure:
50 kPa (0.5 kgf/cm
4. Apply the specified negative pressure
and check that there is no air leakage.
Specified pressure:
30 kPa (0.3 kgf/cm
5. Connect the special service tool to the
fuel pump outlet.
4-7
Fuel system
S63P4090
2
, 7.3 psi)
S63P4100
2
, 4.4 psi)
6. Apply the specified positive pressure and
check that there is no air leakage. Disas-
semble the fuel pump if necessary.
Specified pressure:
50 kPa (0.5 kgf/cm
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.
S63P4110
2
, 7.3 psi)
S60C4060
63P3F11