Removing The Fuel Filter Assembly; Checking The Fuel Filter Assembly; Checking The Fuel Filter Element; Checking The Fuel Cup Assembly - Yamaha F30B 2018 Service Manual

Removing the fuel filter assembly

Cover the fuel components using a rag to pre-
vent fuel from spilling out.

Checking the fuel filter assembly

1. Check:
• No air leakage
Air leakage  Replace the O-ring, fuel cup
assembly, or fuel filter assembly.
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a. Connect the special service tool "1" to the
fuel inlet "a".
b. Block the fuel outlet "b" using a rubber plug
"2", and then apply the specified positive
pressure. Replace the O-ring, fuel cup as-
sembly, or fuel filter assembly if the speci-
fied pressure cannot be maintained for 15
seconds or more.
b
a
b
2
Vacuum/pressure pump gauge
set "1"
90890-06945
Pressure/vacuum tester "1"
YB-35956-B
Fuel inlet holding pressure (posi-
tive pressure)
200.0 kPa (2.00 kgf/cm2, 29.0
psi)
c. Connect the special service tool "1" to the
fuel outlet "a".
1
a
6-5
d. Block the fuel inlet "b" using a rubber plug
"2", and then apply the specified negative
pressure. Replace the O-ring, fuel cup as-
sembly, or fuel filter assembly if the speci-
fied pressure cannot be maintained for 15
seconds or more.
a
b
a
2
Vacuum/pressure pump gauge
set "1"
90890-06945
Pressure/vacuum tester "1"
YB-35956-B
Fuel outlet holding pressure (neg-
ative pressure)
80.0 kPa (0.80 kgf/cm2, 11.6 psi)
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Checking the fuel filter element

1. Check:
• Fuel filter element
Dirt/residue  Replace.

Checking the fuel cup assembly

1. Check:
• Fuel cup assembly
Foreign material  Clean.
Cracked  Replace.
When cleaning the fuel cup assembly, do
not remove the clip and float.
Fuel filter
1
b