Cummins/Onan 3.6MKY / 4MKY — Fuel Filter Replacement
Maintenance
For the Cummins/Onan 3.6MKY / 4MKY, from the Cummins/Onan service manual.
Applies to: Cummins/Onan 3.6MKY, Cummins/Onan 4MKY
Before you start
- Gasoline is flammable and explosive; eliminate all ignition sources.
- Use genuine Onan replacement fuel filter only.
Procedure
- Close the fuel supply valve or remove the fuel line and plug the end.
- Run the genset until it runs out of fuel; allow it to cool down.
- Use a deep 11/16-inch socket to unscrew the filter from the fuel pump.
- Install a new fuel filter and tighten securely to prevent fuel leakage.
- Connect the fuel line and open the fuel valve.
- Start the genset and check for fuel leaks; repair any leaks immediately.
Tools required
- Deep 11/16-inch socket Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Source: Cummins/Onan service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.