Cummins/Onan — Storing the Generator Set
Maintenance
From a Cummins/Onan owner's manual covering: 3.3 KY, 3.6 KY, 4.0 KY. Check it applies to your exact model before use.
Applies to: Cummins/Onan 3.6 KY, Cummins/Onan 4.0 KY
Before you start
- Gasoline preservatives are toxic
- Do not open the carburetor drain when the engine is hot
Procedure
- Fill the fuel tank with fresh fuel and add a fuel preservative (gasoline models)
- Run the generator set about 30 minutes plus 2 minutes per foot of fuel line at about 1/2 rated power
- Change the engine oil and tag the oil grade/viscosity
- Remove the air filter, restart, and spray engine fogger into the carburetor while running
- Stop the generator set
- Disconnect all appliances
- Disconnect battery cables (negative first) and store the battery
- Cap the exhaust tail pipe
- Close the fuel supply valve if equipped
- Position the line circuit breaker to OFF
- Drain the carburetor float bowl (gasoline models)
Full service-parts list: Cummins/Onan 3.6 KY →, Cummins/Onan 4.0 KY →
Source: Cummins/Onan owner's 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.