WARNING: DUE TO EXTREME FUEL PRESSURES OF UP TO 160,000 kPa (23,206 PSI), USE EXTREME CAU-
TION WHEN INSPECTING FOR HIGH-PRESSURE FUEL LEAKS. DO NOT GET YOUR HAND OR A FINGER
NEAR A SUSPECTED LEAK. INSPECT FOR HIGH-PRESSURE FUEL LEAKS WITH A SHEET OF CARD-
BOARD. HIGH FUEL INJECTION PRESSURE CAN CAUSE PERSONAL INJURY IF CONTACT IS MADE WITH
THE SKIN.
Start the engine. Move the cardboard over the suspected high-pressure fuel line leak, and check for fuel spray onto
the cardboard. If line is leaking, retorque line. Replace damaged, restricted or leaking high-pressure fuel lines with
the correct replacement line.
CAUTION: The high-pressure fuel lines must be clamped securely in place in the holders. The lines cannot
contact each other or other components. Do not attempt to weld high-pressure fuel lines or to repair lines
that are damaged. Only use the recommended lines when replacement of high-pressure fuel line is
necessary.
REMOVAL
CAUTION: Cleanliness cannot be overemphasized
when handling or replacing diesel fuel system
components. This especially includes the fuel
injectors, high-pressure fuel lines and fuel injec-
tion pump. Very tight tolerances are used with
these parts. Dirt contamination could cause rapid
part wear and possible plugging of fuel injector
nozzle tip holes. This in turn could lead to possi-
ble engine misfire. Always wash/clean any fuel
system component thoroughly before disassembly
and then air dry. Cap or cover any open part after
disassembly. Before assembly, examine each part
for dirt, grease or other contaminants and clean if
necessary. When installing new parts, lubricate
them with clean engine oil or clean diesel fuel
only.
1. Disconnect both negative battery cables from both
batteries. Cover and isolate ends of cables.
2. Thoroughly clean fuel lines at both ends.
3. If removing fuel line at either #1 or #2 cylinder, the
intake manifold air heater elements must first be
removed from top of intake manifold. Refer to
Intake Air Heater Removal / Installation for proce-
dures.
4. If removing fuel line at #6 cylinder, a bracket (1) is
located above fuel line connection at cylinder head.
Two bolts secure this bracket to rear of cylinder
head. The upper bolt hole is slotted. Loosen (but
do not remove) these 2 bracket bolts. Tilt bracket
down to gain access to #6 fuel line connection.
5. Remove engine lift bracket (if necessary).
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FUEL DELIVERY - DIESEL
DR/DH