Checking The Fuel Pump Assembly; Disassembling The Fuel Pump - Yamaha F30B 2018 Service Manual

Checking the fuel pump assembly

1. Check:
• No air leakage
Air leakage  Disassemble and check the
fuel pump. See "Disassembling the fuel
pump" (6-9).
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a. Connect the special service tool "1" to the
fuel pump inlet "a".
b. Block the fuel pump outlet "b" using a rub-
ber plug "2", and then apply the specified
positive pressure. Check that there is no
air leakage.
a
2
b
Vacuum/pressure pump gauge
set "1"
90890-06945
Pressure/vacuum tester "1"
YB-35956-B
Fuel inlet holding pressure (posi-
tive pressure)
50.0 kPa (0.50 kgf/cm², 7.3 psi)
c. Apply the specified negative pressure, and
then check that there is no air leakage.
d. Connect the special service tool "1" to the
e. Block the fuel pump inlet "b" using a rubber
f.
1
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Disassembling the fuel pump

1. Disassemble:
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a. Align the groove "a" in the fuel pump body
6-9
Fuel inlet holding pressure (nega-
tive pressure)
30.0 kPa (0.30 kgf/cm², 4.4 psi)
fuel pump outlet "a".
plug "2".
Apply the specified positive pressure, and
then check that there is no air leakage.
a
2
b
Fuel outlet holding pressure (pos-
itive pressure)
50.0 kPa (0.50 kgf/cm², 7.3 psi)
• Fuel pump body
"1" with the hole "b" in the plunger "2" by
turning them.
2
a
Fuel pump assembly
1
b
1