See Figures 1 and 2
Depending on the model year, engine and fuel delivery system, the fuel filter could be located in several different locations. Also, some models have more than one fuel filter. Before removing any fuel filter, identify the type of engine in the vehicle, and whether the engine utilizes one or more fuel filters.
The fuel filter on carbureted engines is located on the carburetor where the fuel inlet line is attached. These fuel filters are one piece units that cannot be cleaned.
On fuel injected engines available between 1986-88, there are three fuel filters: one inside the inline reservoir, one at the electric fuel pump mounted on the chassis and a third on the low pressure electric fuel pump mounted inside the fuel tank itself. On these models the fuel filter is part of a modular assembly which also contains the fuel supply pump. Normally, only the filters at the chassis mounted pump and fuel reservoir are replaced as part of normal maintenance.
On all 1989-96 models, fuel is filtered at two locations: one maintenance-free type on the inlet (suction) of the electric fuel pump inside the fuel tank and the other through an in-line fuel filter located on the left hand frame side rail downstream from the fuel pump.
REMOVAL & INSTALLATION
See Figure 3
- Remove the air cleaner assembly.
- Using two flare or open ended wrenches, one on the fuel line and one holding the filter body, loosen and disconnect the fuel inlet line from the filter. Use a clean rag under the fitting to catch any fuel.
- Unscrew the fuel filter from the carburetor fuel inlet.
- Apply one drop of Loctite® (or equivalent) hydraulic sealant to the external threads of the new fuel filter, then thread the filter into the carburetor inlet port.
- Tighten the fuel filter to 6-8 ft. lbs. (9-11 Nm). Do not overtighten.
- Thread the fuel supply line into the filter and, using two wrenches as before, tighten the fuel supply line nut to 15-18 ft. lbs. (20-24 Nm).
- Start the engine and check for any fuel leaks. Correct any fuel leak immediately.
- Install the air cleaner assembly. Dispose of any gasoline soaked rags properly.
See Figures 4 through 8
- Remove the fuel tank cap to vent tank pressure.
Relieve the fuel system pressure by:
- Detach the electrical connector from the inertia switch and crank the engine for 15-30 seconds until it runs out of fuel and dies. The inertia switch is located on the toe board to the right of the transmission hump or the kick panel to the right of the passenger's seat below the heater duct. After the fuel pressure is relieved, remember to re-connect it.
- Raise the vehicle and support it safely on jackstands.
- Locate the fuel filter mounted to the underbody, on the left frame bracket.
Clean all dirt and/or grease from the fuel filter fittings. "Quick-Connect" fittings are used on all models. These fittings must be disconnected using the proper procedure or the fittings may be damaged. The fuel filter uses a "hairpin" clip retainer. To remove the clip;
- Spread the two hairpin clip legs about 1 / 8 in. (3mm) each to disengage it from the fitting, then pull the clip outward. Use finger pressure only; do not use any tools. Disconnect both fittings from the fuel filter.
Ford recommends that the retaining clips be replaced whenever removed.
- Place a container below the fuel filter to capture any fuel which may spill out.
- Remove the fuel filter and retainer from the metal mounting bracket.
- Remove the rubber insulator rings from the filter and the filter retainer. Note that the direction of fuel flow (arrow on the filter) points to the open end of the retainer.
- Place the new filter into the retainer with the flow arrow pointing toward the open end.
- Install the insulator rings.
- Install the retainer on the metal bracket and tighten the mounting bolts.
- Fasten the quick-connect fittings onto the filter ends. A click will be heard when the hairpin clip snaps into its proper position. Pull on the lines with moderate pressure to ensure proper connection.
- Cycle the ignition switch from the OFF to ON position several times to re-charge the fuel system before attempting to start the engine. Start the engine and check for any fuel leaks.
- Lower the vehicle.