The inline fuel filter on the Mustang is normally found under the vehicle, near the fuel tank, mounted to the rear crossmember.
See Figure 1
See Figures 2 and 3
Fuel is filtered at 3 separate locations on these vehicles:
- Fuel pump inlet filter-A nylon filter element is attached to the electric fuel pump inlet inside the fuel tank. It is used to protect the fuel pump from possible tank contamination.
- Inline fuel filter-The inline fuel filter is designed to filter material which could damage the tiny metering orifices of the injector nozzles. The filter is located downstream of the electric fuel pump and is usually mounted to the rear crossmember. The inline filter is of one-piece construction, meaning that it cannot be cleaned and must be replaced as an assembly should it become clogged. Because flow will vary between filter elements, be sure to only use the proper replacement part which is designed for your engine's fuel system.
- Injector filter screen-Each fuel injector contains a filter screen at the top (fuel inlet point). If the injector screen becomes clogged, the complete injector assembly must be replaced.
Of these 3 fuel filters, only the inline type has ever really been considered a maintenance item. The others are expected to serve the life of the components to which they are attached. But even the inline fuel filters have become more efficient, so no periodic replacement interval is recommended by the manufacturer. It is never a bad idea to replace the filter on a older vehicle or a used vehicle where the quality of gasoline which may have been used in the car is not known. Likewise, any vehicle that shows signs of fuel filter clogging (such as hesitation or stumbling on acceleration, which cannot be traced to the ignition system or other fuel system components) is a good candidate for an inline filter replacement.
REMOVAL & INSTALLATION
This procedure applies only to the inline fuel filter.
To prevent the siphoning of fuel from the tank when the filter is removed, raise the front of the vehicle slightly above the level of the tank, but be sure to properly support the vehicle using jackstands. Fuel line clamps may be used to prevent leakage, but ONLY WITH CAUTION. Old, brittle fuel lines may be damaged by the clamps and could leak afterwards. If a clamp is used, BE SURE to thoroughly inspect the lines after installation of the fuel filter. Any damaged line should be immediately replaced.
See Figures 4, 5 and 6
- Disconnect the negative battery cable.
- Properly relieve the fuel system pressure using a test gauge at the fuel pressure relief valve. For more details, please refer to Fuel System of this guide.
- Raise and safely support the rear of the vehicle on jackstands.
- Detach the fuel lines from both ends of the fuel filter by disengaging both push-connect fittings (for details on push-connect fitting removal, please refer to Fuel System of this guide). Install new retainer clips in each push-connect fitting prior to reassembly.
Position a rag below the filter to catch any fuel which may spill as it is disconnected and removed.
- Remove the fuel filter from the bracket by loosening the worm gear clamp. Note the orientation of the direction-of-flow arrow on the fuel filter, as installed in the bracket, to ensure proper fuel flow through the replacement filter.
- Install the fuel filter into the bracket, ensuring the proper direction of flow. Tighten the worm gear clamp to 15-25 inch lbs. (2-3 Nm).
- Install the push-connect fittings onto the filter ends. Connect the negative battery cable, then start the engine and check for fuel leaks.
- Lower the vehicle.