Illustration 14
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(1) High-pressure line
(2) High-pressure line
(3) High-pressure line
(4) High-pressure line
(5) Fuel transfer line that is high pressure
(6) High-pressure pump
(7) High-pressure line
(8) High-pressure fuel manifold (rail)
The high-pressure fuel lines are the fuel lines that are
between the high-pressure fuel pump and the high-
pressure fuel manifold and the fuel lines that are
between the fuel manifold and electronic unit
injectors. These fuel lines are different from fuel lines
on other fuel systems.
The fuel lines are different because of the following
items:
• The high-pressure fuel lines are constantly
charged with high pressure.
• The internal pressures of the high-pressure fuel
lines 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
deflect 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
point of weakness and potential failure.
Do not check the high-pressure fuel lines with the
engine or the starting motor in operation. After the
engine has stopped, you must wait for 10 minutes to
allow the fuel pressure to be purged from the high-
pressure fuel lines before any service or repair is
performed on the engine fuel lines. The 10 minute
wait will also allow static charge to dissipate from the
low-pressure fuel system.
Do not loosen the high-pressure fuel lines to remove
air from the fuel system. This procedure is not
required.
Visually 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 to avoid a fluid
penetration hazard. Refer to Operation and
Maintenance Manual, “General hazard Information”.
• Inspect the high-pressure fuel lines for damage,
deformation, a nick, a cut, a crease, or a dent.
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M0108133-04