Question about 1984 Mercury Grand Marquis

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Looking for the location of the fuel filter on an 1984 Mercury Grand Marquis

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Never smoke when working around or near gasoline! Make sure that there is no igniting source near your work area! Fuel Injected Engines The fuel filter is of a one-piece construction which cannot be cleaned. If it becomes clogged, it must be removed and replaced. When replacing the fuel filter use the filter specified for the engine being serviced. The inline filter is mounted on the same bracket as the fuel supply pump. It is on the frame rail under passenger side of the vehicle, in front of the fuel tank. To replace the filter: Fig. 4: Whenever you see a warning label, read it Looking for the location of - 86651210.jpg
Fuel supply lines on fuel injected vehicles will remain pressurized for some time after the engine is shut off. Fuel pressure must be relieved before servicing the fuel system.

  1. Disconnect the negative battery cable.
  2. Relieve the fuel system pressure as follows:
    1. Remove the fuel tank cap to relieve any pressure in the fuel tank.
    2. Remove the cap from the Schrader valve located on the fuel injection supply manifold in the engine compartment.
    3. Attach fuel pressure gauge T80L–9974–A or equivalent, to the Schrader valve and drain the fuel through the drain tube into a suitable container.
    4. After the fuel system pressure is relieved, remove the fuel pressure gauge and install the cap on the Schrader valve.
  3. Raise and safely support the vehicle on jackstands.
  4. Disconnect the fittings from both ends of the fuel filter as follows:
    1. Inspect the visible portion of the fitting for dirt accumulation. If more than a light coating of dust is present, clean the fitting before disassembly.
    2. Some adhesion between the seals in the fitting and the filter will occur with time. To separate, twist the fitting on the filter, then push and pull the fitting until it moves freely on the filter.
    3. Remove the hairpin clip from the fitting by first bending and breaking the shipping tab. Next, spread the 2 clip legs by hand about 1⁄8 in. (3.1mm) each to disengage the body, then push the legs into the fitting. Lightly pull the triangular end of the clip and work it clear of the filter and fitting. NOTE: Do not use hand tools to complete this operation. Damage to the fittings may result.
    4. Grasp the fitting and pull in an axial direction to remove the fitting from the filter. Be careful on 90°elbow connectors, as excessive side loading could break the connector body.
    5. After disassembly, inspect the inside of the fitting for any internal parts such as O-rings and/or spacers that may have been dislodged from the fitting. Replace any damaged connector(s). Fig. 5: Carefully remove the hairpin clip 86651211.jpg
      Fig. 6: With a rag under the hose to catch any gasoline spillage, slowly separate the line from the filter

  5. If equipped, remove the filter retainer bolts and remove the filter and retainer from the mounting bracket. Remove the filter from the retainer. Note that the direction of the flow arrow on the fuel filter. Remove the rubber insulator rings, if installed. Inspect the rings for cracks or wear, and replace if needed. Fig. 7: Remove the hardware securing Looking for the location of - 86651213.jpgo the housing 86651213.jpg
    Fig.Looking for the location of - 86651214.jpge filter assembly, then separate the pieces 86651214.jpg
    To install:
  6. Install the fuel filter with the flow arrow facing the proper direction as before, then tighten the filter retaining clamp(s).
  7. If the original filter was equipped with rubber insulator rings, install the rubber insulator rings on the new filter. Install the filter into the retainer with the flow arrow pointing in the correct direction. Install the retainer on the bracket and tighten the mounting bolts to 27–44 inch lbs. (3–5 Nm).
  8. Connect the fittings at both ends of the fuel filter as follows:
    1. Install a new connector if damage was found. Insert a new clip into any 2 adjacent openings with the triangular portion pointing away from the fitting opening. Install the clip until the legs of the clip are locked on the outside of the body. Piloting with an index finger is necessary.
    2. Before installing the fitting on the filter, wipe the filter end with a clean cloth. Inspect the inside of the fitting to make sure it is free of dirt and/or obstructions.
    3. Apply a light coating of engine oil to the filter end. Align the fitting and filter axially and push the fitting onto the filter end. When the fitting is engaged, a definite click will be heard. Pull on the fitting to make sure it is fully engaged.
  9. Connect the negative battery cable. Start the engine and check for fuel leaks.
  10. Lower the vehicle.

Posted on Aug 03, 2010

  • Duane Wong
    Duane Wong Aug 03, 2010

    Carbureted Engines

    1. Disconnect the negative battery cable.
    2. Remove the air cleaner assembly.
    3. Locate the filter in the engine compartment. If connected to a rubber hose, loosen the hose clamps with a pair of pliers, then slide the clamp down the hose, away from the filter.
    4. If the filter is connected to a steel line, position an appropriate open-ended or flare type wrench on the filter hex nut to hold the filter in position. Now, remove the steel line from the filter using another open-ended or flare wrench.

      Fig. 1: Filter used on carburetors equipped with a steel fuel line

      Fig. 2: Filter used on carburetors equipped with a length of rubber hose between the fuel line and filter

    5. Use an appropriate flare type or open-ended wrench to remove the filter from the carburetor.
      To install:

    6. If equipped with a rubber hose, install the new length of hose to the fuel line. Use a new clamp to secure it.
    7. Insert the filter in the mounting hole, and turn the filter by hand. When hand-tight, use a suitable wrench to tighten it 1–2 more turns.
    8. If installing a rubber hose, slide the hose onto the filter and secure with a new clamp.
    9. If equipped with a steel line, apply a thin layer of motor oil to the threads of the steel line. Insert the line into the filter and tighten fitting by hand. When hand-tight, use a flare or open-ended wrench and tighten until just snug.
    10. Install the air cleaner.
    11. Connect the negative battery cable.
    12. Start the engine and check for fuel leaks.

    NOTE: Model 2700 VV and 7200 VV carburetors use a replaceable filter located behind the carburetor inlet fitting.
    The engine should be cool before beginning this procedure. Otherwise your hands may get burned while attempting the removal and installation.

    1. Disconnect the negative battery cable.
    2. Remove the air cleaner assembly.
    3. Wrap a rag around the fitting, and use a open-ended or flare wrench on the inlet fitting to unscrew the fuel line from the inlet fitting.
      Because of pressure build up in the fuel line, it is possible for gasoline to spray out when unscrewing the line! Wear protective glasses to protect your eyes, and loosen the fitting slowly!

    4. Move the fuel line out of the way and unscrew the inlet fitting from the carburetor.
    5. Pull out the filter. The spring behind the filter may come out with it.
      To install:

    6. Install the spring and a new filter. Some kits come with a new spring, use it.
    7. Coat the threads of the inlet fitting with a non-hardening, gasoline-proof sealer, then screw it into place by hand. Tighten snugly with your hand, then tighten an additional 1–2 turns using a flare or open-ended wrench.
      NOTE: Do not overtighten the inlet fitting! The threads in the carburetor bowl are soft metal and are easily stripped!

    8. Using your hand at first, then a open-end or flare wrench, screw the fuel line into the fitting and tighten using the same method as the inlet fitting.
    9. Wipe up any spilled fuel. Start the engine and check the connections for leaks.
    10. Install the air cleaner.

      Fig. 3: Inline fuel filter for 2700 and 7200 VV type carburetors



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