Cummins/Onan 4.0BGEFA261 OOL / 4.0BGEFA26100L — Storing the Genset
Maintenance
For the Cummins/Onan 4.0BGEFA261 OOL / 4.0BGEFA26100L, from the Cummins/Onan operator's manual.
Applies to: Cummins/Onan EM (SN5782U1G2RA) engine
Before you start
- Gasoline preservatives (stabilizers) are toxic; follow container label instructions, avoid skin contact and wash hands with soap and water after dispensing.
Procedure
- Fill the fuel tank with fresh fuel and add a fuel preservative (OnaFresh™) per container label instructions.
- Run the genset about 10 minutes at approximately 1/2 rated power to fill fuel lines and carburetor with treated fuel.
- Turn off air conditioner and other large loads, push the genset line circuit breaker to OFF and stop the genset.
- Remove the air filter and restart the genset; spray an engine fogger (OnaGard™) into the carburetor and then stop the genset.
- Change the air filter element if it is dirty.
- Change the engine oil and attach a tag indicating its oil viscosity.
- Disconnect the battery cables (negative [-] cable first) and store the battery per battery manufacturer's recommendations.
- Plug the exhaust tail pipe to keep out dirt, moisture and bugs.
- Close the fuel supply valve (if so equipped).
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Store if idle more than 120 days
- Run about 10 minutes at approximately 1/2 rated power
Source: Cummins/Onan operator'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.