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Checking the high-pressure fuel
pump
1. Check the high-pressure fuel pump. See
“Checking the low-pressure fuel pump
and high-pressure fuel pump” (5-46).
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 float height, it should be rest-
ing on the needle valve. Do not press the
float.
Checking the check valve
1. Connect the special service tool 1 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 1 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.
K
M
L
J
I
a
Float height a:
67.5 ± 2.5 mm (2.66 ± 0.10 in)
Vacuum/pressure pump gauge set 1:
90890-06756
a
b
1
b
a
1
Vapor separator and high-pressure fuel pump
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