14 SEBU8605-01
Safety Section
High Pressure Fuel Lines
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Illustration 14
(1) High
-pressu re line
(2) High
-pressu re line
(3) Hig
h-pressure line
(4) High
-pressu re line
(5) H igh
-pressure fuel manifold ( rail)
(6) Hig
h-pressure line
(7) Fuel
transfer line that is high pressure
The high-pressure fuel lines are the fuel lines that
are bet
ween the high-pressure fuel pump and the
high-pressure fuel manifold and the fuel lines that are
between the fuel manifold and cylinder head. These
fuel l
ines are different from fuel lines on other fuel
systems.
These
differences are because of the following items:
•
The high-pressure fuel lines are constantly charged
with
high pressure.
•
The internal pressures of the high-pressure fuel
line
s are higher than other types of fuel system.
•
The high-pressure fuel lines are formed to shape
and
then strengthened by a special process.
Do not step on the high-pressure fuel lines. Do not
defl
ect the high-pressure fuel lines. Do not bend or
strike the high-pressure fuel lines. Deformation or
damage of the high-pressure fuel lines may cause a
po
int of weakness and potential failure.
Do not check the high-pressure fuel lines with the
en
gine or the starting motor in operation. After the
engine has stopped wait 10 minutes in order to allow
the fuel pressure to be purged from the high-pressure
f
uel lines. before any service or repair is performed.
Do not loosen the high-pressure fuel lines in order
to rem o
ve air from the fuel system. This procedure
is not required.
Visua
lly inspect the high-pressure fuel lines before
the engine is started. This inspection should be each
day.
If you inspect the engine in operation, always use
the proper inspection procedure in order to avoid
a flui
d penetration hazard. Refer to Operation and
Maintenance Manual, “General hazard Information”.
•
Insp
ect the high-pressure fuel lines for damage,
deformation, a nick, a cut, a crease, or a dent.
•
Do n
ot operate the engine with a fuel leak. If there
is a leak, do not tighten the connection in order
to stop the leak. The connection must only be
tig
htened to the recommended torque. Refer to
Disassembly and Assembly, “Fuel injection lines -
Remove and Fuel injection lines - Install”.
•
If the high-pressure fuel lines are torqued correctly,
and the high-pressure fuel lines are leaking the
hi
gh-pressure fuel lines must be replaced.
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