PIN AS 3166951 - Caterpillar

Fuel leaked or spilled onto hot surfaces or electrical components can cause a fire. To help prevent possible injury, turn the start switch off when changing fuel filters or water separator elements. Clean up fuel spills immediately.
Do not allow dirt to enter the fuel system. Thoroughly clean the area around a fuel system component that will be disconnected. Fit a suitable cover over disconnected fuel system component.
Primary Filter
Servicing the Primary Filters During Engine Operation
Illustration 1 g00477786
Primary filters in the "FILTER 1 RUN" position
(1) Lock
(2) Lever
(3) Drain valve
(4) Nut
To service "FILTER 2", lift lock (1) and turn lever (2) to the "FILTER 1 RUN" position. Release the lock.
Hold a suitable container under drain valve (3). Open the drain valve. Allow the moisture to drain. Close the drain valve.
Remove nut (4). Remove the filter case.
Illustration 2 g00477788
(5) Element
(6) Seals
Remove element (5) and seals (6).
Clean the filter case, the element, and the seals with clean, nonflammable solvent. Allow the parts to dry.
Inspect the element and the seals for good condition. Obtain new parts, if necessary. See the Parts Manual for the engine.
Assemble the clean, dry element, seals, and filter case. Use clean diesel fuel on the seals to make installation easier. Tighten nut (4). Close drain valve (3).
Lift lock (1) and move lever (2) to the "BOTH RUN" position for one minute.
To service "FILTER 1", lift lock (1) and turn lever (2) to the "FILTER 2 RUN" position. Release the lock.
Repeat Steps 2 through 8 for "FILTER 1". Servicing the Primary Filters With the Engine Stopped
Ensure that the fuel to the engine is OFF.
Refer to "Servicing the Primary Filters During Engine Operation". Perform Steps 2 through 7 for both filters. It may be necessary to prime the fuel system before the engine will start. See this Operation and Maintenance Manual, "Fuel System - Prime" topic (Maintenance Section).Water Separator
Replace the water separator element according to the instructions that are provided by the OEM of the water separator.