Yamaha F225F, Service Manual

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6-40
Vapor separator and high-pressure fuel pump
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A
Checking the high-pressure fuel
pump
1. Check the electrical performance of the
high-pressure fuel pump. See “Checking
the low-pressure fuel pump and high-
pressure fuel pump” (5-37).
Checking the vapor separator
1. Check the needle valve. Replace the
needle valve assembly if bent or worn.
2. Check the float. Replace if deteriorated.
3. Check the filter. Clean if there is dirt or
residue.
4. Place the cover assembly upside down,
and then measure the float height
a
.
TIP:
To measure the height of the float, it should
be resting on the needle valve. Do not press
the float.
Checking the check valve
1. Connect the special service tool
a
to the
check valve port
a
.
2. Apply positive pressure and check that
air comes out of the opposite end
b
of
the check valve. Replace the check valve
if no air comes out.
3. Connect the special service tool
a
to the
opposite check valve port
b
.
4. Apply positive pressure and check that
no air comes out of the opposite end
a
of the check valve. Replace the check
valve if air comes out.
Assembling the vapor separator
Do not reuse a gasket, always replace it
with a new one.
1. Install the needle valve assembly
a
, and
then tighten the needle valve assembly
screw
b
to the specified torque.
2. Install the float
c
and pin
d
, and then
tighten the float pin screw
e
to the
specified torque.
Float height
a
:
67.5 ± 2.5 mm (2.66 ± 0.10 in)
a
Vacuum/pressure pump gauge set
a
:
90890-06756
a b
a
b a
a