John Deere — 9. Install retaining ring onto mounting base and tighten

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

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Procedure

1. 10. Bleed fuel system. See BLEED THE FUEL SYSTEM
2. in Section 04, Group 150 later in this manual.
3. 11. If applicable, connect water in fuel sensor connector.
4. 5
5. 1. Thoroughly clean fuel filter/water bowl assembly and
6. surrounding area to keep from getting dirt and debris
7. into fuel system.
8. 2. Connect a fuel line to filter drain and drain all fuel from
9. system.
10. 3. Remove final fuel filter element (A). See REPLACE
11. FINAL FUEL FILTER ELEMENT later in this Group.
12. NOTE: Fuel lines may be connected to different filter inlet
13. and outlet ports depending on engine application.
14. 4. Disconnect fuel lines from fuel inlet (B), air bleed valve
15. fitting (D) (if applicable), and fuel outlet (C).
16. 5. Remove cap screws and final fuel filter base. Remove
17. final filter.
18. 6. Replace parts as necessary.
19. 7. Install filter base on engine cylinder head. Tighten cap
20. screws to specifications.

Source: manual:CTM220.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.