GM Prizm/Nova 1985-1993 Repair Guide

Fuel Filter

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REMOVAL & INSTALLATION

The fuel filter is located on the firewall. The element inside the filter reduces the flow speed of the fuel causing dirt particles that are heavier than gasoline to settle to the bottom. The lighter particles are filtered by the element.

Carbureted Engine

See Figure 1


CAUTION
Gasoline is hazardous and extremely flammable. Remove the hoses slowly and contain spillage. Observe no smoking/no open flame precautions. Have a Class B-C (dry powder) fire extinguisher within arm's reach at all times.

  1. Remove the fuel filler cap.
  2.  
  3. Note the routing of inlet and outlet lines and the direction of flow as marked by the arrow on the filter. With a pair of pliers, shift the clips on the inlet and outlet hoses back and well away from the connections on the filter.
  4.  
  5. Disconnect the fuel lines, using a twisting motion to break them loose. Pull the filter out of its retaining clip. Plug the lines immediately to prevent spillage.
  6.  

To install:
  1. Install the filter in the holder. When reconnecting the fuel lines, make sure the hoses are connected to the correct ports on the filter. The arrow on the filter indicates direction of flow and points towards the carburetor.
  2.  
  3. Install the hose clips to the inside of the bulged sections of the fuel filter connections, and not right at the ends of the fuel lines. Start the engine and check for leaks.
  4.  
  5. Install the fuel filler cap.
  6.  



Click image to see an enlarged view

Fig. Fig. 1: Carbureted engine fuel filter and mounting bracket

Fuel Injected Engines

See Figures 2 and 3


CAUTION
The fuel system is under pressure. Release pressure slowly and contain spillage. Observe no smoking/no open flame precautions. Have a Class B-C (dry powder) fire extinguisher within arm's reach at all times. Perform this procedure only on a cold motor.

  1. Disconnect the negative battery cable.
  2.  
  3. Relieve the pressure in the fuel line as follows:
    1. Fit a wrench of the exact size onto the upper line connection and fit a second wrench on the flats of the filter. This counter holding arrangement will prevent the filter and lines from turning during removal.
    2.  
    3. Wrap the upper filter area in layers of rags to absorb spray and spillage.
    4.  
    5. Slowly loosen the bolt holding the line to the filter. When the pressure is equalized, remove the bolt and the line. Plug the line immediately.
    6.  

  4.  
  5. Again using two wrenches, disconnect the lower line to the filter. Be prepared to deal with fuel spillage. Be very careful not to crimp or bend the fuel line. Plug the line immediately.
  6.  
  7. Remove the filter from its holder.
  8.  

To install:
  1. Install a new filter. Apply a thin coat of oil to the threads and connect the bottom fuel line to the filter. Always begin the threads by hand, then tighten to 22 ft.lbs.
  2.  
  3. Install the upper line with NEW gaskets. Make sure the line is held within the forked bracket on the filter and begin the bolt by hand to insure proper threading.
  4.  
  5. Tighten the bolt to 22 ft.lbs. Reconnect the negative battery cable.
  6.  
  7. Start the engine and check for leaks. (The engine may require a longer period of cranking until it starts due to loss of fuel pressure.)
  8.  



Click image to see an enlarged view

Fig. Fig. 2: Replacing the fuel filter for the fuel injection system - 1988



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Fig. Fig. 3: Replacing the fuel filter for the fuel injection system - 1989-92

 
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