The fuel filter/water separator protects the fuel injection pump on the diesel-powered vehicles covered in this guide. The fuel filter/water separator is located on the left hand side of the engine, above the starter motor. The fuel filter is located within the fuel filter/water separator housing.
Water should be removed from the system whenever the water-in-fuel warning lamp remains lit.
The procedure for simple maintenance of the fuel filter/water separator is given here. For more detailed procedures for the replacement or service of the assembly, refer "Fuel System".
Removal & Installation
Drain all the water and diesel fuel from the housing assembly as follows:
- Place a drain pan under the drain hose.
- With the engine OFF , either rotate the valve to "DRAIN" or lift the valve upward (depending on model) until all water and contaminants have been removed and the fluid stream is clear fuel.
- If the filter is being replaced, drain the housing completely until all water and fuel is removed.
- After the filter/separator is empty, close the valve handle.
- Remove the fuel filter cap by removing the nut on top of the canister. On late models the "nut" is part of the cap.
- The fuel filter will be removed with the cap.
- Inspect the o-rings for cracks, distortion, or any other signs of deterioration. Replace as needed.
- Clean and inspect the inside of the canister.
- Install new o-ring(s) as needed.
- Install the proper filter element in the canister.
- Fill the canister with clean diesel fuel.
- Apply a coating of diesel fuel to all seals.
- Position the cap to the canister. On 1997-99 models, be sure the locating tabs are properly lined up to avoid breaking the canister or having the drain valve handle contact the throttle linkage.
- Install the canister cap. On 1997-99 models, install and tighten nut to 10 ft. lbs. (14 Nm). On later models, tighten cap to 25 ft. lbs. (34 Nm).
- Start engine and check for leaks by holding a piece of cardboard around seal area. Check cardboard for signs of diesel fuel.