Dodge Nitro. Manual - part 666

SEPARATOR-FUEL FILTER/WATER 

DESCRIPTION 

FUEL FILTER/WATER SEPARATOR 

The fuel filter/water separator assembly (8) is located on the left-rear side of the engine compartment. The 
assembly includes the fuel filter (7), fuel heater (1), fuel temperature sensor (5), combination water drain 
valve/Water-In-Fuel (WIF) sensor (6), and a quick-connect fittings attached at the side of the fuel filter canister.

at High Pressure Pump

28

20

247

Fuel Injector Fuel Lines 

at Fuel Rail

5

-

44

PLUS 75° TURN 

High Pressure Fuel Feed 

Line at Fuel Rail

5

-

44

PLUS 75° TURN 

Fuel Injector Lines at the 

Fuel Injectors

28

20

247

Fuel Rail Bolts

24.5

18

-

Fuel Pressure Sensor

35

26

-

Water In Fuel Sensor

1.2

-

10

Fuel Water/Separator 

Mounting Nuts

24.5

24

-

Fuel Line Hose Clamp

14.7

11

62

Fuel Quantity Solenoid

11

-

97

Fuel Tank Bolts

61

45

-

Fuel Filler Tube Clamp

3.5

-

30

APP Sensor

11

-

97

Fuel Pressure Solenoid 

Mounting Nut

Refer to INSTALLATION Procedure.

 

2007 Dodge Nitro R/T 

2007 ENGINE Fuel System - Nitro

  

Fig. 42: Fuel Filter/Water Separator Components 
Courtesy of CHRYSLER LLC 

OPERATION 

FUEL FILTER/WATER SEPARATOR 

The fuel filter/water separator protects the fuel injection pump by removing water and contaminants from the 
fuel. The construction of the filter/separator allows fuel to pass through it, but helps prevent moisture (water) 
from doing so. Moisture collects at the bottom of the filter. 

Refer to the maintenance schedules in the owners manual for the recommended fuel filter replacement intervals.

For draining of water from canister, refer to Fuel Filter/Water Separator Removal/Installation. 

A Water-In-Fuel (WIF) sensor is attached to the bottom of fuel filter element. 

The fuel heater and fuel temperature sensor are installed into the side of the filter/separator housing. 

REMOVAL 

FUEL FILTER/WATER SEPARATOR 

Refer to maintenance schedules, or the Owner's Manual for recommended fuel filter replacement intervals.

 

2007 Dodge Nitro R/T 

2007 ENGINE Fuel System - Nitro

  

Fig. 43: Fuel Filter/Water Separator Components 
Courtesy of CHRYSLER LLC 

DRAINING WATER FROM FUEL FILTER CANISTER:  

The combination housing drain valve/WIF sensor (6) serves two purposes. One is to partially drain the filter 
housing of excess water. The other is to partially drain the housing for fuel temperature sensor, fuel filter or 
fuel heater element replacement. 

The filter housing should be partially drained whenever the water-in-fuel warning lamp remains illuminated. 
(Note that lamp will be illuminated for approximately two seconds when ignition key is initially placed in ON 
position for a bulb check). 

1. A nipple is located at the bottom of drain valve (6). Attach a drain hose to this nipple. Place drain pan 

under drain hose.  

2. With engine not running, Disconnect WIF sensor electrical connector (4) then rotate drain valve (6) 

approximately two revolutions to open it. Leave open until all water and contaminants have been 
removed and clean fuel exits. Hand tighten drain valve after tightening.  

3. If fuel heater element is being replaced, drain housing completely. Dispose of mixture in drain pan 

according to applicable regulations.  

4. After draining operation, close and tighten drain valve (6). 

 

2007 Dodge Nitro R/T 

2007 ENGINE Fuel System - Nitro

  

Fig. 44: Fuel Filter/Water Separator Components 
Courtesy of CHRYSLER LLC 

5. FUEL FILTER REPLACEMENT:  

6. Clean all debris from around filter canister (7) and canister head.  

7. Open drain valve (6) two complete revolutions. Drain approximately 1 cup of fuel into a waste canister. 

Dispose of fuel according to environmental regulations.  

8. Remove drain hose from drain valve (6).  

9. Use an oil filter type wrench to loosen filter (7). Continue removing filter by hand. 

 

2007 Dodge Nitro R/T 

2007 ENGINE Fuel System - Nitro