Caterpillar — Fuel System Primary Filter (Water Separator) Element - Replace

A Caterpillar service procedure — check it applies to your exact model before use.

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Procedure

1. Remove the filter bowl (2) from the filter head (5). Press on the element (4). Rotate the element counterclockwise in order to release the element for the filter bowl and remove the element from the bowl. Discard the used element.
2. Remove the O ring (3) from the filter bowl and clean the filter bowl. Check that the threads of the filter bowl are not damaged.
3. Install a new O ring seal (3) to the filter bowl (2).
4. Locate a new filter element (4) into the filter bowl. Press on the element and rotate the element clockwise in order to lock the element into the filter bowl.
5. Install the filter bowl (4) into the top of the filter head (5).
6. Tighten the filter bowl by hand until the filter bowl contacts the filter head. Rotate the filter bowl through 90 degrees.
7. Open the valves for the fuel lines (if equipped).

Source: manual:Cat-Operation-and-Maintenance-Manual-C3.3-and-C4.4-rental-generator-sets.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.