Yamaha F30A 2018, Service Manual

Page: 136 / 348

6-9
Fuel pump assembly
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.
c. Apply the specified negative pressure, and
then check that there is no air leakage.
d. Connect the special service tool “1” to the
fuel pump outlet “a”.
e. Block the fuel pump inlet “b” using a rubber
plug “2”.
f. Apply the specified positive pressure, and
then check that there is no air leakage.
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Disassembling the fuel pump
1. Disassemble:
• Fuel pump body
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a. Align the groove “a” in the fuel pump body
“1” with the hole “b” in the plunger “2” by
turning them.
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)
a
b
2
1
Fuel inlet holding pressure (nega-
tive pressure)
30.0 kPa (0.30 kgf/cm², 4.4 psi)
Fuel outlet holding pressure (pos-
itive pressure)
50.0 kPa (0.50 kgf/cm², 7.3 psi)
a
b
2
1
2
b
1
a