Jeep Wagoneer/Commando/Cherokee 1984-1998

Fuel Filter

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Removal & Installation



Carbureted Engines
2.5L ENGINES

See Figure 1

  1. Remove and discard the fuel filter, hoses and clamps.
  2.  
  3. Install the new fuel filter with arrows on the casing pointing toward the carburetor and fuel return nipple facing upward.
  4.  
  5. Secure the filter with new hoses and clamps.
  6.  



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Fig. Fig. 1: Fuel flow on the 2.5L carbureted engine fuel filter

2.8L ENGINES

See Figure 2

  1. Remove the air cleaner assembly to gain access to the carburetor inlet nut.
  2.  
  3. Clean all debris away from the manifold and place rags below the fuel line and inlet nut to absorb any fuel spillage.
  4.  
  5. Hold the large inlet nut with a wrench and loosen the fuel line fitting with a flare nut wrench. (This wrench is designed to prevent stripping of the fuel line fitting).
  6.  
  7. Pull the fuel pipe from the carburetor and catch any fuel with a clean rag. Next, unscrew the large nut. There is a spring behind the nut, so be careful. Remove the spring and the old filter.
  8.  

To install:
  1. Install the new filter and, if you are at all in doubt about its condition, a new gasket behind the inlet nut.
  2.  
  3. Tighten the inlet nut carefully, because the carburetor is made of very soft metal and the threads could EASILY strip. Hold the inlet nut securely while tightening the fuel line fitting.
  4.  
  5. Start the vehicle and check for leaks.
  6.  



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Fig. Fig. 2: The fuel filter on the 2.8L engine in located in the inlet nut

Gasoline Fuel Injection Engines
EXCEPT 1997-98 ENGINES

See Figures 3 and 4

The fuel filter is located under the vehicle, mounted on the frame rail on the driver's side.

  1. Disconnect the battery ground cable.
  2.  
  3. Remove the fuel tank filler cap.
  4.  


CAUTION
Don't allow fuel to spray or spill on the engine or exhaust manifold! Place heavy shop towels under the pressure port to absorb any escaped fuel! Do not smoke while working near fuel vapors.



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Fig. Fig. 3: Remove the hoses and clamps from the filter



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Fig. Fig. 4: Remove the filter strap bolt and then remove the filter

  1. Relieve the fuel system pressure. Refer to Fuel System for the proper procedure.
  2.  
  3. Raise and safely support the rear end on jackstands.
  4.  
  5. Remove the hoses and clamps from the filter.
  6.  
  7. Remove the filter strap bolt and remove the filter.
  8.  

To install:

The filter is marked for installation. IN goes towards the fuel tank OUT towards the engine.

  1. Place the new filter on the frame rail and tighten the strap bolt to 106 inch lbs. (12 Nm).
  2.  
  3. Install and securely clamp the hoses.
  4.  
  5. Lower the vehicle and connect the negative battery cable.
  6.  
  7. Start the vehicle and check for leaks.
  8.  

1997-98 ENGINES

See Figures 5, 6 and 7


CAUTION
Observe all applicable safety precautions when working around fuel. Whenever servicing the fuel system, always work in a well ventilated area. Do not allow fuel spray or vapors to come in contact with a spark or open flame. Keep a dry chemical fire extinguisher near the work area. Always keep fuel in a container specifically designed for fuel storage; also, always properly seal fuel containers to avoid the possibility of fire or explosion.

The fuel filter is an integral component of the fuel pressure regulator, which is mounted on top of the fuel pump module, located in the fuel tank. When the fuel filter/regulator assembly requires service, the fuel tank must be removed from the vehicle, however, the fuel pump module does not need to be removed.

  1. Disconnect the battery ground cable.
  2.  
  3. Relieve the fuel system pressure. Refer to Fuel System for the proper procedure.
  4.  
  5. Remove the fuel tank assembly.
  6.  
  7. Clean the area around the fuel filter/regulator.
  8.  



Click image to see an enlarged view

Fig. Fig. 5: Remove the fuel filter/pressure regulator retaining clip from the top of the assembly



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Fig. Fig. 6: Replace the old fuel filter/pressure regulator mounting gasket

  1. Disengage the retaining clamp from the top of the filter/regulator assembly. Discard the retaining clamp.
  2.  
  3. Using 2 small prying tools, pry the filter/regulator assembly out from the top of the fuel pump module. The filter/regulator assembly will unsnap from the fuel pump module.
  4.  
  5. Remove and discard the mounting gasket below the filter/regulator.
  6.  
  7. Before discarding the fuel filter/pressure regulator assembly, inspect the assembly to verify that the O-rings are intact. If the smallest of the 2 O-rings cannot be found on the bottom of the filter/regulator, it may be necessary to remove it from the fuel inlet passage in the fuel pump module.
  8.  

To install:


Click image to see an enlarged view

Fig. Fig. 7: Check the condition of the fuel filter/pressure regulator O-rings

  1. Clean the recessed area in the pump module where the filter/regulator assembly is to be installed.
  2.  
  3. Check the replacement filter/regulator assembly to make sure that the new O-rings are already installed on the assembly.
  4.  
  5. Apply a small amount of clean engine oil to the O-rings.
  6.  
  7. Install a new gasket on top of the fuel pump module.
  8.  
  9. Press the new fuel filter/pressure regulator assembly into the top of the fuel pump module until it snaps into position (a positive click must be heard or felt).
  10.  
  11. The arrow on top of the fuel pump module should be pointed towards the front of the vehicle (12 O&rsquoclock position).
  12.  
  13. Turn the filter/regulator assembly until the supply tube (fitting) is pointed to the 11 O&rsquoclock position.
  14.  
  15. Install new retainer clamp (the clamp snaps over the top of the filter/regulator and locks to the flanges on the pump module).
  16.  
  17. Install the fuel tank assembly.
  18.  
  19. Connect the negative battery cable.
  20.  

Diesel Engines

See Figure 8

  1. Attach one end of a piece of flexible tubing to the filter draincock. Run the other end into a one quart container.
  2.  
  3. Open the filter vent valve and open the draincock. Drain the filter completely.
  4.  
  5. Remove the filter.
  6.  
  7. Discard the filter. Install the new filter, close the vent and drain cock.
  8.  



Click image to see an enlarged view

Fig. Fig. 8: View of the diesel engine fuel filter and related components

 
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