Dodge RAM TRUCK 1500 1995 Service Manual page 1098

14 • • 16 FUEL DELIVERY SYSTEM—DIESEL ENGINE
repair lines that are damaged. Only use the recom­
mended lines when replacement of high-pressure
fuel line is necessary.
High-pressure fuel lines deliver fuel under pressure
of up to approximately 120,000 kPa (17,405 PSI)
from the injection pump to the fuel injectors. The
lines expand and contract from the high-pressure
fuel pulses generated during the injection process. All
high-pressure fuel lines are of the same length and
inside diameter. Correct high-pressure fuel line usage
and installation is critical to smooth engine opera­
tion.
WARNING: U S E E X T R E M E CAUTION W H E N IN­
SPECTING FOR H I G H - P R E S S U R E F U E L L E A K S . IN­
S P E C T FOR H I G H - P R E S S U R E F U E L L E A K S WITH A
S H E E T OF CARDBOARD. HIGH F U E L INJECTION
P R E S S U R E CAN C A U S E P E R S O N A L INJURY IF
CONTACT IS MADE WITH THE SKIN.
For removal and installation procedures, refer to
the Diesel Engine—Component Removal/Installation
section of this group.
INTAKE MANIFOLD AIR HEATER
The intake manifold air heater is controlled by the
powertrain control module (PCM). Refer to the Diesel
Engine—Component Description/System Operation
section of this group for an operational description.
Refer to the Diesel Engine—General Diagnosis sec­
tion for diagnosis. Refer to the Diesel Engine—Com­
ponent Removal/Installation section for removal/
installation procedures.
INTAKE MANIFOLD AIR HEATER RELAYS
The relays for the intake manifold air heater are
controlled by the powertrain control module (PCM).
Refer to the Diesel Engine—Component Description/
System Operation section of this group for an opera­
tional description. Refer to the Diesel Engine—
General Diagnosis section for diagnosis. Refer to the
Diesel Engine—Component Removal/Installation sec­
tion for removal/installation procedures.
INTAKE MANIFOLD AIR TEMPERATURE SENSOR
The intake manifold air temperature sensor is con­
trolled by the powertrain control module (PCM). Re­
fer to the Diesel Engine sections of this group for an
operational description, diagnosis and removal/instal­
lation procedures.
FUEL INJECTION PUMP
The fuel injection pump is a Bosch P7100 series in­
line type (Fig. 9). The injection pump is driven by the
engine camshaft. A gear on the end of the pump shaft
meshes with the camshaft gear. The pump is timed
For removal and installation procedures, refer to
the Diesel Engine —Component Removal/Installation
section of this group.
For draining of water, refer to the Diesel Engine—
Component Removal/Installation section of this
group. See Fuel Filter/Water Separator.
FUEL FILTER
Refer to Fuel Filter/Water Separator for informa-
:
tion.
FUEL FILTER—IN TANK
Refer to Fuel Tank Module—Diesel Engine for re­
moval and installation. This can be found in the Fuel
Delivery—Diesel Engine section of this group.
FUEL SYSTEM PRESSURE WARNING
WARNING: H I G H - P R E S S U R E F U E L LINES DELIVER
D I E S E L F U E L UNDER E X T R E M E P R E S S U R E FROM
THE INJECTION PUMP TO THE F U E L I N J E C T O R S .
THIS MAY B E A S HIGH A S 120,000 KPA (17,405 PSI).
U S E E X T R E M E CAUTION W H E N INSPECTING FOR
H I G H - P R E S S U R E F U E L L E A K S . INSPECT FOR
H I G H - P R E S S U R E F U E L L E A K S WITH A S H E E T OF
CARDBOARD. HIGH F U E L INJECTION P R E S S U R E
CAN C A U S E P E R S O N A L INJURY IF CONTACT IS
MADE WITH THE SKIN.
FUEL SYSTEM PRESSURE TEST—DIESEL ENGINE
For fuel pressure tests, refer to the Diesel Engine—
General Diagnosis section of this group.
FUEL TRANSFER PUMP CAPACITY TEST—DIESEL
ENGINE
For fuel pump capacity tests, refer to the Diesel
Engine—General Diagnosis section of this group.
FUEL TUBES/LINES/HOSES AND CLAMPS—LOW-
PRESSURE TYPE
Refer to Fuel Tubes/Lines/Hoses and Clamps. Also
refer to the section on Quick-Connect Fittings. These
can be found in the Fuel Delivery—Except Diesel sec­
tion of this group.
QUICK-CONNECT FITTINGS
Refer to Quick-Connect Fittings. These can be
found in the Fuel Delivery—Except Diesel section of
this group.
HIGH-PRESSURE FUEL LINES
CAUTION: The high-pressure fuel lines must be
held securely in place in their holders. The lines
cannot contact each other or other components. Do
not attempt to weld high-pressure fuel lines or to