Page 1385 of 1938

WARNING: DO NOT ATTEMPT TO DRAIN WATER
FROM THE FILTER/SEPARATOR WITH THE ENGINE
HOT.
(1) The bottom of the filter/separator bowl is
equipped with a drain valve (Fig. 29). The drain
valve is equipped with a fitting. Attach a piece of
rubber hose to this fitting. This hose is to be used as
a drain hose.
(2) Place a drain pan under the drain hose.
(3) With the engine not running, open the drain
valve (unscrewÐdrain valve has right hand threads)
from the filter/separator bowl. To gain access to this
fitting, the two filter±to±mounting bracket nuts (Fig.
29) may have to be loosened a few turns.
(4) Hold the drain open until clean fuel exits the
drain.
(5) After draining, close drain valve.
(6) Remove rubber drain hose.
(7) Dispose of mixture in drain pan according to
applicable local or federal regulations.
FUEL FILTER REMOVAL
(1) Drain all fuel and/or water from fuel filter/wa-
ter separator assembly. Refer to the previous Drain-
ing Water From Filter Bowl.
(2) Unplug the electrical connectors at bottom of
plastic bowl.
(3) Remove plastic bowl from bottom of fuel filter
(unscrews).
(4) Remove fuel filter from bottom of filter base
(unscrews).
FUEL FILTER INSTALLATION
(1) Clean bottom of fuel filter base.
(2) Apply clean diesel fuel to new fuel filter gasket.
(3) Install and tighten filter to filter base. The bev-
eled part of the rubber gasket should be facing up
towards the filter base.
(4) Clean the inside of bowl with a soap and water
mixture before installation. Carefully clean any resi-
due between the two metal probes at the top of the
water±in±fuel sensor. Do not use chemical cleaners
as damage to the plastic bowl may result.
(5) Pour diesel fuel into the plastic bowl before
installing bowl to bottom of fuel filter. Do this to help
prevent air from entering fuel injection pump while
attempting to starting engine.
(6) Install filter bowl to bottom of filter.
(7) Install the electrical connectors at bottom of
bowl.
(8) Tighten the filter±to±mounting bracket nuts
(Fig. 29) to 28 N´m (250 in. lbs.) torque.
FUEL HEATER
If the fuel heater element needs replacement, the
plastic filter bowl assembly must be replaced. Refer
to Fuel Filter/Water Separator for information.
FUEL HEATER RELAY
The fuel heater relay is located in the PDC. For
the location of the relay within the PDC (Fig. 30),
refer to label on PDC cover.
Fig. 29 Fuel Filter/Water Separator Location
Fig. 30 Power Distribution Center (PDC) Location
NS/GSFUEL SYSTEMÐ2.5L DIESEL ENGINE/2.0L GAS ENGINE 14 - 17
REMOVAL AND INSTALLATION (Continued)
Page 1386 of 1938

FUEL LEVEL SENSOR
REMOVAL
Remove fuel reservoir module. Refer to Fuel Reser-
voir Module in this section.
(1) Depress retaining tab and remove the level
sensor connector from theBOTTOMof the fuel mod-
ule electrical connector (Fig. 31).
NOTE: The pump module harness on TOP of flange
is not serviceable or removable.
(2) Pull off blue locking wedge (Fig. 32).
(3) Using a small screwdriver lift locking finger
away from terminal and push terminal out of connec-
tor (Fig. 33).
(4) Push level sensor signal and ground terminals
out of the connector (Fig. 34).(5) Insert a screwdriver between the fuel module
and the top of the level sensor housing (Fig. 35).
Push level sensor down slightly.
(6) Slide level sensor wires through opening fuel
module (Fig. 36).
(7) Slide level sensor out of installation channel in
module.
Fig. 31 Fuel Module/Level Sensor Electrical
Connector
Fig. 32 Wire Terminal Locking Wedge
Fig. 33 Wire Terminal Locking Finger
Fig. 34 Removing Wires From Connector
Fig. 35 Loosening Level Sensor
14 - 18 FUEL SYSTEMÐ2.5L DIESEL ENGINE/2.0L GAS ENGINENS/GS
REMOVAL AND INSTALLATION (Continued)
Page 1387 of 1938

INSTALLATION
(1) Insert level sensor wires into bottom of opening
in module.
(2) Wrap wires into groove in back of level sensor
(Fig. 37).
(3) While feeding wires into guide grooves, slide
level sensor up into channel until it snaps into place
(Fig. 38). Ensure tab at bottom of sensor locks in
place.
(4) Install level sensor wires in connector. Push
the wires up through the connector and then pull
them down until they lock in place. Ensure signal
and ground wires are installed in the correct posi-
tion.
(5) Install locking wedge on connector.
(6) Push connector up into bottom of fuel module
electrical connector.
(7) Install fuel module. Refer to Fuel Reservoir
Module in this section.FUEL INJECTION PUMP
REMOVAL
(1) Disconnect negative battery cable at battery.
(2) Thoroughly clean the area around the injection
pump and fuel lines of all dirt, grease and other con-
taminants.Due to the close internal tolerances
of the injection pump, this step must be per-
formed before removing pump.
(3) Remove the engine accessory drive belt. Refer
to Group 7, Cooling System for procedures.
(4) Remove the generator assembly.
(5) Remove the rubber fuel return and supply
hoses from metal lines at pump (Fig. 39).
(6) Remove the electrical connector at engine cool-
ant temperature sensor (Fig. 40).
(7) Disconnect the Fuel Injection Pump electrical
connector at fuel pump. (Fig. 39).
Fig. 36 Level Sensor Removal/Installation
Fig. 37 Groove in Back Side of Level Sensor
Fig. 38 Installation Channel
Fig. 39 Overflow Valve and Fuel Shutdown Solenoid
NS/GSFUEL SYSTEMÐ2.5L DIESEL ENGINE/2.0L GAS ENGINE 14 - 19
REMOVAL AND INSTALLATION (Continued)
Page 1388 of 1938

(8) Disconnect the main engine wiring harness
from the glow plugs.
(9) Disconnect the four high±pressure fuel lines
from the fuel injection pump. Also disconnect fuel
lines at the fuel injectors. For procedures, refer to
High±Pressure Fuel Lines in this group. Place a rag
beneath the fittings to catch excess fuel.
(10) Remove plug from timing gear cover.
(11) The ªTop Dead Centerº (TDC) compression fir-
ing stroke must be determined as follows:
(a) Remove the valve cover, refer to Group 9,
Valve Cover Removal/Installation.
(b) Remove the right front tire and splash
shield. Using a socket attached to the end of crank-
shaft, rotate the engine (counterÐclockwise as
viewed from front).
(c) Rotate the engine until cylinder #4 rockers
are in between movement.
(d) Remove rocker arm assembly.
(e) Remove valve spring and keepers.CAU-
TION: When the piston is at TDC there is only
2 mm (.080 thousand) clearance between the
valve and piston.
(f) Let the valve set on top of piston. Install a
dial indicator to the top of the valve stem.
(g) Rotate engine back and forth to find the TDC
position with the indicator on the valve stem. Mark
the damper and timing cover for TDC.
NOTE: On later model 1997 engines, a hole in the
bottom of the clutch housing can be lined up with a
hole in the flywheel, allowing the engine to be held
at TDC with a special alignment tool, part # VM1035.(12) Remove injection pump drive gear nut (Fig.
41) and washer.CAUTION: Be very careful not to
drop the washer into the timing gear cover.
(13) A special 3±piece gear removal tool set
VM.1003 (Fig. 42) must be used to remove the injec-
tion pump drive gear from the pump shaft.
(a) Thread the adapter (Fig. 43) into the timing
cover.
(b) Thread the gear puller into the injection
pump drive gear (Fig. 43). This tool is also used to
hold the gear in synchronization during pump
removal.
(c) Remove the three injection pump±to±gear
cover mounting nuts (Fig. 44).CAUTION: This
step must be done to prevent breakage of the
Fig. 40 Engine Coolant Temperature Sensor
Fig. 41 Removing Pump Drive Gear Nut
Fig. 42 Pump Gear Tools
14 - 20 FUEL SYSTEMÐ2.5L DIESEL ENGINE/2.0L GAS ENGINENS/GS
REMOVAL AND INSTALLATION (Continued)
Page 1389 of 1938

three injection pump mounting flanges while
gear is being removed.
(d) Install the drive bolt into the gear puller
(Fig. 43). Tighten the drive bolt to press (remove)
the drive gear from injection pump shaft while
driving injection pump rearward from timing gear
cover mounting studs.
(14) Remove pump from engine.Do not rotate
engine while gear puller is installed. Engine
damage will occur.
INSTALLATION/ADJUSTING PUMP TIMING
(1) Clean the mating surfaces of injection pump
and timing gear cover.
(2) Install a new injection pump±to±timing gear
cover gasket.(3) Remove the gear removing bolt (drive bolt)
from gear puller.CAUTION: Do not remove the
special gear puller or timing cover adapter
tools from timing cover at this time. Gear mis-
alignment will result.
(4) P
lace the key way on the pump shaft to the 11
o'clock position as viewed from the front of pump.
Install the pump into the rear of timing gear cover
while aligning key way on pump shaft into pump gear.
(5) Install and snug the 3 injection pump mount-
ing nuts. This is not the final tightening sequence.
(6) Remove the special gear puller and adapter
tools from timing gear cover.
(7) Install the injection pump drive gear nut and
washer. Tighten nut to 88 N´m (65 ft. lbs.) torque.
(8) Remove access plug and plug washer at rear of
pump (Fig. 45). Thread special dial indicator adapter
tool VM.1011 (Fig. 46) into this opening. Hand
tighten only.
(9) Attach special dial indicator tool VM.1013 into
the adapter tool (Fig. 46).
(10) Using a socket attached to the end of crank-
shaft, rotate the engine (counterÐclockwise as
viewed from front) until thedial indicator stops mov-
ing. This rotation is about 20É to 30É.
(11) S
et the dial indicator to 0 mm. Be sure the tip of
dial indicator is touching the tip inside the adapter tool.
(12) Very slowly rotate the crankshaft clockwise
until movement on dial indicator needle has stopped.
Do not rotate crankshaft after needle move-
ment has stopped. Engine should be at TDC at
this point
(13) Check the TDC dial indicator for TDC.
Fig. 43 Installing Pump Drive Gear Removal Tools
Fig. 44 Injection Pump Mounting Nuts
Fig. 45 Access Plug at Rear of Pump
NS/GSFUEL SYSTEMÐ2.5L DIESEL ENGINE/2.0L GAS ENGINE 14 - 21
REMOVAL AND INSTALLATION (Continued)
Page 1390 of 1938

(14) Gauge reading should be at 0.60 mm. If not,
the pump must be rotated for adjustment:
(a) Loosen the three injection pump mounting
nuts at the mounting flanges. These flanges are
equipped with slotted holes. The slotted holes are
used to rotate and position the injection pump for
fuel timing. Loosen the three nuts just enough to
rotate the pump.
(b) Rotate the pumpclockwise(as viewed from
front) until .60 mm is indicated on the dial indica-
tor gauge.
(c) Tighten the three pump mounting nuts to 30
N´m (22 ft. lbs.) torque.
(d) Recheck the dial indicator after tightening
the pump mounting nuts. Gauge should still be
reading 0.60 mm. Loosen pump mounting nuts and
readjust if necessary.
(15) Remove dial indicator and adapter tools.
(16) Install access plug and washer to rear of
injection pump.
(17) Install plug at timing gear cover.
(18) Remove dial indicator from valve stem.
(19) Install valve spring and keepers.
(20) Install rocker arm assembly and tighten nuts.
(21) Install and connect the four high±pressure
fuel lines to the fuel injection pump. Also connect
fuel lines at the fuel injectors. For procedures, refer
to High±Pressure Fuel Lines in this group.
(22) Install electrical connector at engine coolant
temperature sensor.
(23) Connect electrical connector at fuel shutdown
solenoid.(24) Connect the main engine wiring harness to
the glow plugs.
(25) Connect the fuel timing solenoid pigtail har-
ness to the engine wiring harness.
(26) Connect the overflow valve/banjo fitting (fuel
return line assembly). Replace copper gaskets before
installing.
(27) Connect the rubber fuel return and supply
hoses to metal lines at pump. Tighten hose clamps to
2 N´m (20 in. lbs.) torque.
(28) Install generator assembly.
(29) Install engine accessory drive belt. Refer to
Group 7, Cooling System for procedures.
(30) Install negative battery cable to battery.
(31) Start the engine and bring to normal operat-
ing temperature.
(32) Check for fuel leaks.
FUEL INJECTORS
Four fuel injectors are used on each engine. Of these
four, two different types are used. The fuel injector used
on cylinder number one is equipped with a fuel injector
sensor (Fig. 47). The other three fuel injectors are iden-
tical.
Do not place the fuel injector equipped with
the fuel injector sensor into any other location
except the cylinder number one position.
REMOVAL
(1) Disconnect negative battery cable at battery.
(2) Thoroughly clean the area around the injector
with compressed air.
(3) Remove the fuel drain hoses (tubes) at each
injector (Fig. 48) being serviced. Each of these hoses
is slip±fit to the fitting on injector.
(4) Remove the high±pressure fuel line at injector
being removed. Refer to High±Pressure Fuel Lines in
this group for procedures.
(5) Remove the injector using special socket tool
number VM.1012A. When removing cylinder number
Fig. 46 Installing Dial Indicator and Special Adapter
Tools
Fig. 47 Fuel Injector SensorÐNumber±1 Cylinder
14 - 22 FUEL SYSTEMÐ2.5L DIESEL ENGINE/2.0L GAS ENGINENS/GS
REMOVAL AND INSTALLATION (Continued)
Page 1391 of 1938

one injector, thread the wiring harness through the
access hole on the special socket (Fig. 49).
(6) Remove and discard the copper washer (seal) at
bottom of injector (Fig. 47).
INSTALLATION
(1) Clean the injector threads in cylinder head.
(2) Install new copper washer (seal) to injector.
(3) Install injector to engine. Tighten to 70 N´m
(52 ft. lbs.) torque.
(4) Install high±pressure fuel lines. Refer to High-
±Pressure Fuel Lines in this group for procedures.
(5) Install fuel drain hoses (tubes) to each injector.
Do not use clamps at fuel drain hoses.
(6) Connect negative battery cable to battery.
(7) Bleed the air from the high±pressure lines.
Refer to the Air Bleed Procedure section of this
group.
FUEL SHUTDOWN SOLENOID
The solenoid is mounted to the rear of the injection
pump (Fig. 50).
REMOVAL
(1) Thoroughly clean the area around the solenoid
with compressed air.
(2) Disconnect the fuel return line and banjo fit-
ting above the solenoid by removing (un±threading)
the overflow valve (Fig. 50). Place a towel below the
valve before removal. Discard old sealing washers
after removal.
(3) Disconnect the electrical connector nut (Fig.
50).
(4) Remove wiring at solenoid.
(5) Remove solenoid from injection pump.
INSTALLATION
(1) Install solenoid into injection pump.
(2) Install wiring and nut at solenoid.
(3) Install new sealing washers to banjo fitting.
(4) Install overflow valve, banjo fitting and fuel
return line to pump.
(5) Bleed air from system. Refer to Air Bleed Pro-
cedures in this section of the group.
FUEL TANK
REMOVAL
(1) Disconnect negative cable from battery.
(2) Insert fuel siphon hose into fuel filler neck and
push it into the tank.
(3) Drain fuel tank dry into holding tank or a
properly labeleddieselsafety container.
Fig. 48 Fuel InjectorÐTypical
Fig. 49 Wiring Harness Through Socket
Fig. 50 Fuel Shutdown Solenoid Location
NS/GSFUEL SYSTEMÐ2.5L DIESEL ENGINE/2.0L GAS ENGINE 14 - 23
REMOVAL AND INSTALLATION (Continued)
Page 1392 of 1938

(4) Raise vehicle on hoist.
(5) Disconnect both the fuel fill and fuel vent rub-
ber hoses at the fuel tank.
(6) Disconnect fuel supply and return lines from
the steel supply line (Fig. 51).
The fuel reservoir module electrical connec-
tor has a retainer that locks it in place.
(7) Slide electrical connector lock to unlock (Fig.
52).
(8) Push down on connector retainer (Fig. 53) and
pull connector off module.
(9) Use a transmission jack to support fuel tank.
Remove bolts from fuel tank straps.
(10) Lower tank slightly. Carefully remove filler
hose from tank.(11) Lower the fuel tank. Remove clamp and
remove fuel filler tube vent hose. Remove fuel tank
from vehicle.
INSTALLATION
(1) Position fuel tank on transmission jack. Con-
nect fuel filler tube vent hose and replace clamp.
(2) Raise tank into position and carefully work
filler tube into tank. A light coating of clean engine
oil on the tube end may be used to aid assembly.
(3) Feed filler vent line thru frame rail. Careful
not to cross lines.
(4) Tighten strap bolts to 54 N´m (40 ft. lbs.)
torque. Remove transmission jack.
CAUTION: Ensure straps are not twisted or bent
before or after tightening strap nuts.
(5) Connect module electrical connector. Place
retainer in locked position.
(6) Lubricate the fuel supply and return lines with
clean 30 weight engine oil, install the quick connect
Fuel Tank
Fig. 51 Fuel Tank and Lines
Fig. 52 Fuel Line Retainers and Pump Connector
Lock
Fig. 53 Module Connector Retainer and Lock
14 - 24 FUEL SYSTEMÐ2.5L DIESEL ENGINE/2.0L GAS ENGINENS/GS
REMOVAL AND INSTALLATION (Continued)