Pretty simple Fuel filter change on a 2021 Silverado 1500 with the LM2 3.0L Duramax Diesel.

Per GM document from Service Information:
1. Clean Housing
2. Drain Water/Fuel Separator
3. Remove Water Separator Assembly
4. With assembly upside down, remove filter from cap
5. Remove and discard 2 o-rings
6. Clean Cap, Install Cap o-ring and install filter into cap
7. Install o-ring on filter housing pipe
8. Install and tighten to 18 ft lbs
9. Prime fuel system - Ignition on for 2 minutes. Ignition Off. Start the vehicle. If the engine does not start, repeat. if engine starts but runs rough, increase idle slowly to purge air from fuel system. Inspect for leaks.
10. Reset fuel filter monitor on dash.

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