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    1996 Chevrolet Impala SS 5.7L SFI OHV 8cyl

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    Mazda 323/626/929/GLC/MX-6/RX-7 1978-1989

    Fuel Filter

    Print

    On GLC sedans, hatchbacks and early model wagons, the fuel filter is located on the left side of the engine compartment.

    On later model GLC wagons, it is located under the floor in front of the fuel tank.

    On 1986-87 carbureted 323 models, the fuel filter is located on the left side of the frame.

    On 1986-89 fuel injected 323 models, it is mounted to the upper center of the firewall.

    On 1979-82 626 models, the fuel filter is located under the floor in front of the fuel tank.

    On 1983-85 626 models, the fuel filter is located on the left side of the engine compartment.

    On 1986-89 626 and MX-6 models, it is located on the left side of the engine compartment near the firewall.

    On 1988-89 929 models, the fuel filter is located on the right fender well, near the fuel pulsation damper.

    On 1979-85 RX-7 models, the fuel filter is located beneath the car, just in front of the fuel tank.

    On 1986-89 RX-7 models, it is located on the left side of the engine compartment near the firewall.

    REMOVAL & INSTALLATION



    Carbureted Engines
    EXCEPT RX-7

    See Figures 1 and 2

    1. Remove the trim panel, if so equipped, by unfastening its two securing screws.
    2.  
    3. Loosen the clamps at both ends of the filter and detach both hoses from the filter.
    4.  



    Click image to see an enlarged view

    Fig. Fig. 1: A disposable, cartridge type fuel filter is commonly mounted in the fuel line between the fuel tank and the fuel pump



    Click image to see an enlarged view

    Fig. Fig. 2: Inlet and outlet hoses are fastened to the fuel filter's connectors

    1. Note which way the directional arrows are facing, then unfasten the filter from its mounting bracket.
    2.  

    To install:
    1. Install the new filter in its mounting bracket. Make sure that the arrows are properly positioned.
    2.  
    3. Connect the inlet and outlet hoses to the filter and secure with the hose clamps.
    4.  

    If the fuel lines are connected to the filter with spring tension clamps, it is advisable to replace them with new clamps when the filter is changed.

    1. Start the engine and check the filter connections for leaks by running the tip of your finger around the circumference of each hose.
    2.  
    3. Install the trim panel, if so equipped.
    4.  

    RX-7

    See Figure 3

    1. Raise the rear of the car and safely support it on jackstands. Locate the filter; use the illustration as a guide to its shape and location.
    2.  
    3. Loosen the clamps at both ends of the filter and place a collection pan beneath it to catch any of the fuel that is in the lines.
    4.  



    Click image to see an enlarged view

    Fig. Fig. 3: 1979-85 RX-7 fuel filter location. The arrow shows the direction of fuel flow.

    1. Disconnect the fuel filter lines and remove the filter from its retainer.
    2.  

    To install:
    1. Install the new filter, paying close attention to the direction of the filter in relation to the direction of fuel flow. See the illustration for correct positioning.
    2.  
    3. Connect the inlet and outlet hoses to the filter and secure with the hose clamps.
    4.  

    If the fuel lines are connected to the filter with spring tension clamps, it is advisable to replace them with new clamps when the filter is changed.

    1. Start the engine and check the fuel filter connections for leaks.
    2.  

    Fuel Injected Engines

    CAUTION
    On fuel injected engines, there is considerable residual pressure inside the fuel lines even when the engine is not running. To avoid the possibility of fire or personal injury, fuel pressure must first be relieved from the system as described in this section.

    EXCEPT RX-7

    See Figure 4

    1. Relieve the pressure from the fuel system, as described later in this section.
    2.  
    3. Disconnect the negative battery cable.
    4.  
    5. Slide the fuel line clamps back off the connections on the filter. Then, slowly pull one connection off just until fuel begins to seep out. Place a small plastic container or stuff a couple of rags under the filter to absorb any excess fuel.
    6.  



    Click image to see an enlarged view

    Fig. Fig. 4: On some applications, a "banjo" fitting connects the fuel line and fuel filter

    1. Pull both fuel hoses off the connectors or loosen the union bolts on the "banjo" fittings. Remove the filter from the clamp. On some models, it will be necessary to unbolt the fuel filter from the mounting bracket.
    2.  

    If the fuel filter is equipped with "banjo" type fittings, discard the copper crush gaskets and replace them with new ones.

    To install:
    1. Place the new filter in the clamp or attach it to the bracket, if so equipped.
    2.  
    3. On "banjo" type fittings, install new copper washers and torque the union bolts to 25 ft. lbs. (34 Nm).
    4.  
    5. Attach the hoses to the filter connectors. Make sure the hoses are pushed all the way over the raised portion of the connectors, then secure with hose clamps.
    6.  

    If the fuel lines are connected to the filter with spring tension clamps, it is advisable to replace them with new clamps when the filter is changed.

    1. Connect the negative battery cable.
    2.  
    3. Start the engine and check the fuel filter connections for leaks.
    4.  

    RX-7
    1. Relieve the pressure from the fuel system, as described later in this section.
    2.  
    3. Disconnect the negative battery cable.
    4.  
    5. On 1984-85 models, raise the rear of the vehicle and support it safely. On 1986-89 models, raise the front of the vehicle and support it safely.
    6.  
    7. Loosen the clamps on both hoses and disconnect the hoses from the filter.
    8.  
    9. Loosen the clamp bolts and remove the filter from the bracket.
    10.  

    To install:
    1. Install the new filter in the bracket and tighten the clamp bolts.
    2.  
    3. Push the inlet and outlet hoses all the way onto the fittings and secure them with hose clamps.
    4.  

    If the fuel lines are connected to the filter with spring tension clamps, it is advisable to replace them with new clamps when the filter is changed.

    1. Lower the vehicle and connect the negative battery cable.
    2.  

    Diesel Engines

    See Figure 5

    The fuel filter is located between the sedimenter and the injection pump. The filter element is the replaceable cartridge type.



    Click image to see an enlarged view

    Fig. Fig. 5: Remove the diesel engine fuel filter with an oil filter wrench

    1. Using an oil filter wrench, unscrew the fuel filter from its mounting bracket on the cowl and remove it. Make sure the O-ring comes off with the filter.
    2.  

    To install:
    1. Thoroughly coat the O-ring on the new filter with clean fuel. Install the new filter and tighten it by hand only. Make sure that your hands and the outside of the filter are dry and clean.
    2.  
    3. Bleed the system by repeatedly depressing the bleeder handle on top of the filter mounting bracket until it can no longer be readily depressed.
    4.  

    RELIEVING FUEL SYSTEM PRESSURE



    All Fuel Injected Engines

    Any time the fuel system is opened for maintenance, the fuel system pressure must be relieved first. On fuel injected engines, there is pressure in the fuel lines even when the engine is not running.

    1. Start the engine.
    2.  
    3. While the engine is running, disconnect the fuel pump or circuit opening relay connector(s).
    4.  
    5. Allow the engine to run until it stalls.
    6.  
    7. Reconnect the fuel pump or circuit opening relay connector(s).
    8.  
    9. Proceed with the fuel system repair or service. Whenever a connection is loosened, use rags to prevent fuel leakage. If a line or connection is to be left open for an extended period of time, plug or cover it.
    10.  

     
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