Page 1705 of 2305
Fig. 20 FUEL TANK ASSEMBLY
1 - Strap Bolts (2)
2 - Hose (not with all engines)
3 - Fuel Outlet Line
4 - Fuel Return Line
5 - Plug
6 - Fuel Tank
7 - Tank Straps (2)8 - Nuts (2)
9 - Filler Tube
10 - Vent Hose
11 - Hose
12 - Clamps
13 - Cushioning Material
14 - Two-Way Valve
Fig. 21 FUEL COOLER LINES
1 - Expansion Tank
2-TopofTank
3 - Thermostat (Preheating Valve)
4 - Cooler Lines
5 - Connecting Hoses/Clamps
14 - 24 FUEL DELIVERYVA
Page 1706 of 2305

REMOVAL
(1) Drain diesel fuel from tank. Refer to Standard
Procedure Ð Draining Fuel Tank Ð Diesel.
(2) Disconnect fuel fill and vent lines from body.
(3) Raise and support vehicle.
(4) Support tank with a hydraulic jack.
(5) Remove 2 fuel tank strap nuts (8) (Fig. 23) and
position straps (7) towards left side of vehicle.
(6) Carefully lower tank a few inches and discon-
nect electrical connector at top of fuel pump module.
(7) Disconnect fuel supply line at tank.
(8) Disconnect fuel return line at tank.
(9) Continue to carefully lower tank for removal.
(10) If fuel pump module is to be removed, thor-
oughly clean area at top of fuel pump around module.
(11) If fuel tank is to be replaced, remove fuel
pump module from tank. Refer to Fuel Pump Module
Removal/Installation procedures.
(12) If fuel cooler lines (Fig. 24) are to be removed,
use special pliers #9539 (Fig. 25).
Fig. 22 TOP OF FUEL TANK
1 - Cooler Lines
2-TopofTank
3 - Expansion Tank
4 - Check Valves
5 - Check Valve
6 - Module Lock Ring
7 - Fuel Pump Module
VAFUEL DELIVERY 14 - 25
Page 1707 of 2305
INSTALLATION
(1) If fuel cooler lines (Fig. 27) are to be installed,
use special pliers #9539 (Fig. 28).
(2) If fuel tank is to be replaced, install fuel pump
module into tank. Refer to Fuel Pump Module
Removal/Installation procedures.
(3) Position fuel tank to hydraulic jack.
(4) Raise tank until positioned near body.
Fig. 23 FUEL TANK ASSEMBLY
1 - Strap Bolts (2)
2 - Hose (not with all engines)
3 - Fuel Outlet Line
4 - Fuel Return Line
5 - Plug
6 - Fuel Tank
7 - Tank Straps (2)8 - Nuts (2)
9 - Filler Tube
10 - Vent Hose
11 - Hose
12 - Clamps
13 - Cushioning Material
14 - Two-Way Valve
Fig. 24 FUEL COOLER LINES
1 - Expansion Tank
2-TopofTank
3 - Thermostat (Preheating Valve)
4 - Cooler Lines
5 - Connecting Hoses/Clamps
Fig. 25 FUEL LINE PLIERS-9539
14 - 26 FUEL DELIVERYVA
Page 1708 of 2305
(5) Connect fuel pump module electrical connector
at top of tank.
(6) Connect fuel supply and return lines.
(7) Continue raising tank while guiding fill hose
into body. Raise tank until positioned snug to body.
(8) Install and position both fuel tank support
straps (7) (Fig. 26) to mounting bolts (1).
(9) Install 2 fuel tank strap nuts (8). Refer to
Torque Specifications.
(10) Remove hydraulic jack.
(11) Connect fill and vent hoses to body. Install
ground wire to fill hose.
(12) Lower vehicle.
(13) Fill fuel tank with fuel.
(14) Start engine and check for fuel leaks near top
of module.
VAFUEL DELIVERY 14 - 27
Page 1709 of 2305
FUEL LEVEL SENDING UNIT /
SENSOR
DESCRIPTION
The fuel gauge sending unit (fuel level sensor) is
attached to the side of the fuel pump module (Fig.
29). The sending unit consists of a float, an arm, and
Fig. 26 FUEL TANK ASSEMBLY
1 - Strap Bolts (2)
2 - Hose (not with all engines)
3 - Fuel Outlet Line
4 - Fuel Return Line
5 - Plug
6 - Fuel Tank
7 - Tank Straps (2)8 - Nuts (2)
9 - Filler Tube
10 - Vent Hose
11 - Hose
12 - Clamps
13 - Cushioning Material
14 - Two-Way Valve
Fig. 27 FUEL COOLER LINES
1 - Expansion Tank
2-TopofTank
3 - Thermostat (Preheating Valve)
4 - Cooler Lines
5 - Connecting Hoses/Clamps
Fig. 28 FUEL LINE PLIERS-9539
14 - 28 FUEL DELIVERYVA
Page 1710 of 2305

a variable resistor track (card).
REMOVAL
The fuel level sending unit (fuel level sensor) and
float assembly is located on the side of the fuel pump
module (4) (Fig. 30).
(1) Remove fuel pump module from fuel tank.
Refer to Fuel Pump Module Removal/Installation.
(2) Unplug sensor's 2±wire harness from pump
module electrical connector.
(3) Before disconnecting wiring from 2±wire har-
ness electrical connector, note position of each wire in
the connector. Record this position.
(4) Disconnect wiring from 2±wire harness electri-
cal connector using a terminal pick / removal tool.
Refer to Special Tools in 8W, Wiring for tool part
numbers.
(5) To remove sending unit from pump module,
press on plastic locking tabs (1) (Fig. 30) while slid-
ing sending unit (4) on its tracks.
INSTALLATION
(1) Noting their previous positions, connect wires
from 2±wire harness into its connector.
(2) Plug 2±wire harness connector into pump mod-
ule electrical connector.
(3) Position sending unit (4) (Fig. 31) to tracks on
fuel pump module. Slide and snap into place.
(4) Install fuel pump module. Refer to Fuel Pump
Module Removal/Installation.
Fig. 29 FUEL LEVEL SENSOR
1 - RELEASE TABS
2 - ELECTRIC FUEL PUMP
3 - BOTTOM OF FUEL PUMP MODULE
4 - SENDING UNIT
Fig. 30 FUEL LEVEL SENSOR
1 - RELEASE TABS
2 - ELECTRIC FUEL PUMP
3 - BOTTOM OF FUEL PUMP MODULE
4 - SENDING UNIT
Fig. 31 FUEL LEVEL SENSOR
1 - RELEASE TABS
2 - ELECTRIC FUEL PUMP
3 - BOTTOM OF FUEL PUMP MODULE
4 - SENDING UNIT
VAFUEL DELIVERY 14 - 29
Page 1711 of 2305

WATER IN FUEL SENSOR
DESCRIPTION
The water in fuel sensor (WIF) is located in the
fuel filter housing (Fig. 32). The sensor detects the
presence of water in the fuel. If water is present in
the fuel a signal is sent to the ECM and the ECM
signals the instrument cluster, over the CAN bus, to
illuminate the water in fuel warning.
OPERATION
The non-dielectric properties of the water allow the
sensors probes to close the electronic circuit when
water is present in the system. When diesel fuel is
present in the system, it's dielectric (does not conduct
electricity well) properties do not allow any electrical
contact between the probes. A 12V power signal is
always present in order to illuminate the indicator on
the instrument cluster. For removal and installation
procedure refer to (Refer to 14 - FUEL SYSTEM/
FUEL DELIVERY/FUEL FILTER - REMOVAL).
Fig. 32 WATER IN FUEL SENSOR
1 - WIF SENSOR
2 - WIF DRAIN
3 - FUEL FILTER
4 - FUEL SUPPLY FROM TANK
5 - FUEL SUPPLY TO HIGH PRESSURE PUMP
14 - 30 FUEL DELIVERYVA
Page 1712 of 2305

FUEL INJECTION
TABLE OF CONTENTS
page page
ACCELERATOR PEDAL POSITION SENSOR
DESCRIPTION.........................32
REMOVAL.............................32
INSTALLATION.........................32
BOOST PRESSURE SENSOR
DESCRIPTION.........................33
OPERATION...........................33
DIAGNOSIS AND TESTING - BOOST
PRESSURE SENSOR..................33
REMOVAL.............................33
INSTALLATION.........................33
CAMSHAFT POSITION SENSOR
DESCRIPTION.........................33
OPERATION...........................34
REMOVAL.............................34
INSTALLATION.........................34
CRANKSHAFT POSITION SENSOR
DESCRIPTION.........................35
OPERATION...........................35
REMOVAL.............................35
INSTALLATION.........................35
FUEL INJECTOR
DESCRIPTION
FUEL INJECTOR......................35
OPERATION...........................36
STANDARD PROCEDURE
STANDARD PROCEDURE - INJECTOR
CLASSIFICATION.....................37
CLEANING FUEL INJECTORS............38
REMOVAL.............................38
INSTALLATION.........................39
FUEL PRESSURE SENSOR
DESCRIPTION.........................39
OPERATION...........................39REMOVAL.............................39
INSTALLATION.........................40
FUEL PRESSURE SOLENOID
DESCRIPTION.........................40
OPERATION...........................40
STANDARD PROCEDURE - FUEL PRESSURE
SOLENOID TEST......................41
REMOVAL.............................41
INSTALLATION.........................41
FUEL TEMPERATURE SENSOR
DESCRIPTION.........................42
OPERATION...........................42
REMOVAL.............................42
INSTALLATION.........................42
INTAKE AIR TEMPERATURE SENSOR
DESCRIPTION.........................42
OPERATION...........................43
REMOVAL.............................43
INSTALLATION.........................43
INTAKE AIR PRESSURE SENSOR
DESCRIPTION.........................43
OPERATION...........................43
REMOVAL.............................43
INSTALLATION.........................44
MANIFOLD AIR FLOW (MAF) SENSOR
DESCRIPTION.........................44
OPERATION...........................44
REMOVAL.............................44
INSTALLATION.........................45
O2 SENSOR
DESCRIPTION.........................45
OPERATION...........................45
REMOVAL.............................48
INSTALLATION.........................48
VAFUEL INJECTION 14 - 31