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 describ