Checking The Fuel Pump; Disassembling The Fuel Pump - Yamaha E115A Service Manual

Checking the fuel pump

1. Place a drain pan under the fuel hose
connections, and then disconnect the
fuel hoses from the fuel pump.
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.
61U5H11
6G440010
2 , 7.3 psi)
6G440020
2 , 4.4 psi)
6. Apply the specified positive pressure and
check that there is no air leakage.
Disassemble the fuel pump if necessary.
Specified pressure:
50 kPa (0.5 kgf/cm

Disassembling the fuel pump

1. Disconnect the inlet and outlet hose from
the fuel pump.
2. Remove the 2 bolts 1 securing the
pumps to the crankcase.
3. Remove the 3 screws securing the pump
together. Refer to exploded diagram
P4-15.
NOTE:
Take care not to let the spring fly out or lose
the plate.
4. Check the diaphragm for tears or deteri-
oration. Replace the diaphragm if neces-
sary.
5. Check the valves for bends or damage.
Replace the valve if necessary. Also,
check the fuel pump body and spring for
damage. Replace the fuel pump body
and spring if necessary.
6. Clean the fuel pump body.
Fuel pump
6G440030
, 7.3 psi)
2
1
1
61U40030
4-16
1
2
3
4
5
6
7
8
9