The fuel filter is an inline canister type filter secured to the frame rail of the vehicle. On some models, it is connected by special fittings that must be disconnected properly to avoid leaks. See Fuel System for more information.
Although the manufacturer does not recommend a specific replacement interval for the early model fuel filter, we recommend that the filter be replaced every 30,000 miles (48,000 km).
The late model fuel filter should only be replaced when the filter becomes clogged and causes a drop in fuel pressure, or when the pressure regulator is faulty.
REMOVAL & INSTALLATION
See Figures 1 and 2
The fuel filter on early model vehicles is located on the frame rail under the vehicle. On late model vehicles, the fuel filter is an integral part of the fuel pressure regulator assembly and cannot be serviced separately.
This procedure covers the servicing of early model fuel filters only. For late model fuel filters, refer to the Fuel Pressure Regulator procedure in Fuel System .
- Properly relieve the fuel system pressure, as described in Fuel System .
- Disconnect the negative battery cable.
- Raise and safely support the vehicle on jackstands.
- Place a pan under the fuel filter to catch any residual fuel that may leak out when the filter is removed.
- Remove the inlet and outlet connections while holding the fuel lines stationary.
- Loosen the fuel filter clamp bolt.
- Remove the filter.
- Place the new fuel filter into the mounting bracket.
- Tighten the fuel filter clamp bolt.
- Connect the fuel inlet and outlet lines to the filter.
- Connect the negative battery cable.
- Start the engine and check the filter connections for leaks by running the tip of your finger around each fitting.