GM: Electra/Park Avenue/Ninety-Eight 1990-1993

Fuel Filter

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CAUTION
To reduce the risk of fire and personal injury, it is necessary to relieve the fuel system pressure before servicing any fuel system component. If this procedure is not performed, fuel may be sprayed out of the connection under pressure. Cover fuel hose connections with a shop towel before disconnecting to catch any residual fuel that may still be in the line. Always keep a dry chemical (Class B) fire extinguisher near the work area.

RELIEVING FUEL PRESSURE



Preferred Method
  1. Disconnect the negative battery cable.
  2.  
  3. Loosen the fuel filler cap to relieve fuel tank vapor pressure.
  4.  
  5. Obtain fuel pressure valve J 34730-1 or equivalent. Wrap a shop towel around the fittings while connecting the tool to prevent fuel spillage.
  6.  
  7. Connect the tool to the fuel pressure relief connection at the fuel rail.
  8.  
  9. Install a bleed hose into an approved container and open the valve to bleed the system pressure.
  10.  
  11. Install the fuel filler cap.
  12.  

Alternate Method
  1. If the above tool is not available, you can run the engine out of gas by cutting off the voltage to the fuel pump and running the engine until all available fuel is spent.
  2.  
  3. To accomplish this, remove the fuel pump relay and disconnect the oil pressure sending unit. The oil pressure sending unit is used as a backup path for voltage to take (as long as there is sufficient oil pressure) if the relay were to fail, so be sure to disconnect it also, or the pump will run and the engine won't run out of fuel. The relay is in the relay center under the right side of the instrument panel, and the oil pressure sending unit is on the lower right side of the engine behind the camshaft sensor.
  4.  
  5. Start the engine and run until it stalls from lack of fuel.
  6.  
  7. Disconnect the negative battery cable and proceed with work on the fuel system.
  8.  
  9. Don't forget to install the fuel pump relay and connect the oil pressure sending unit when the job is done.
  10.  

REMOVAL & INSTALLATION





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Fig. Fig. 1 The fuel filter is tucked away on the right side frame rail under these hoses



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Fig. Fig. 2 Fuel filter with flare nut fittings



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Fig. Fig. 3 Fuel filter with quick connect fittings

The fuel filter is located on the right side frame rail where the body starts going up toward the engine compartment.

  1. Relieve the fuel system pressure.
  2.  
  3. Raise the vehicle and support with jackstands.
  4.  
  5. To reduce fuel spillage, place a shop towel over the fuel lines before disconnecting them from the filter. Disconnect the fuel lines from the filter. If equipped with quick connect fittings, squeeze the tabs to disconnect. If equipped with flare nut fittings, use a backup wrench.
  6.  
  7. Remove the filter from its bracket.
  8.  

To install:

  1. Position the new filter in the bracket. Using new O-rings where required, install the fuel lines to the filter. If equipped with flare nut fittings, use a backup wrench to prevent the filter from turning. Torque the fittings to 22 ft. lbs. (30 Nm). If equipped with quick connects, be sure they snap together properly.
  2.  
  3. Lower the vehicle.
  4.  
  5. Connect the negative (-) battery cable, and check for leaks.
  6.  

 
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