Jeep Wagoneer/Commando/Cherokee 1984-1998

Mechanical Fuel Pump

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Removal & Installation



See Figure 1

  1. Disconnect the inlet and outlet fuel lines and, on the 2.8L engine, the fuel return line.
  2.  
  3. Remove the fuel pump body attaching nuts and lock washers.
  4.  
  5. Pull the pump and gasket or O-ring free of the engine.
  6.  

On the 2.8L engine, the actuating rod may fall from the engine.

To install:
  1. Make sure that the mating surfaces of the fuel pump and the engine are clean.
  2.  
  3. Cement a new gasket to the mounting flange of the fuel pump.
  4.  
  5. Position the fuel pump on the engine block so that the lever of the fuel pump rests on the fuel pump cam of the camshaft.
  6.  
  7. Secure the fuel pump to the block with the capscrews and lock washers. tighten the capscrews to 16 ft. lbs. (21 Nm).
  8.  
  9. Connect the fuel lines to the fuel pump.
  10.  



Click image to see an enlarged view

Fig. Fig. 1: Exploded view of the fuel pump and related components-2.8L engine

TESTING



Volume Check
  1. Disconnect the fuel line from the carburetor and place the open end of the line into a graduated one quart container.
  2.  
  3. Start the engine and operate it at a normal idle speed. The pump should deliver at least one pint in 30 seconds.
  4.  
  5. Replace the pump if defective.
  6.  

Pressure Check
  1. Disconnect the fuel line at the carburetor.
  2.  
  3. Install a T-fitting on the open end of the fuel line and refit the line to the carburetor.
  4.  
  5. Plug a pressure gauge into the remaining opening of the T-fitting.
  6.  
  7. The hose leading to the pressure gauge should not be any longer than 6 in. (152mm). On pumps with a fuel return line, the line must be plugged. Start the engine.
  8.  
  9. Fuel pressures are as follows:

    2.5L: 4.00-5.00 psi (27-34 kPa) at idle
     
    2.8L: 6.00-7.50 psi (41-51 kPa) at idle
     

  10.  

 
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