Generator maintenance isn’t just about oil changes and air filters. Generators that sit unused for months develop what mechanics call ‘wet stacking’ — a condition where unburned fuel builds up in the exhaust system, creating carbon deposits that can eventually damage the engine. This happens because generators running under light loads or short test cycles don’t get hot enough to burn fuel completely.
The monthly exercise routine that prevents this isn’t just starting the generator and letting it idle. You need to run it under actual load for at least 30 minutes — meaning turn on your air conditioner, microwave, or other high-draw appliances while it’s running. This brings the engine up to proper operating temperature and burns off any fuel residue that’s been accumulating.
Many RV owners discover this the hard way when they try to fire up their generator after months of storage, only to find it runs rough, produces black smoke, or won’t maintain steady power output. Professional repair shops see this pattern constantly — generators that worked fine when the RV was put away but need expensive cleaning or rebuilding after sitting unused.
If monthly exercise isn’t practical, consider using a fuel stabilizer and running the generator dry before storage. Some owners also install hour meters to track actual runtime versus idle time. The key insight is that generators are designed to work, not sit idle. Regular exercise under load keeps internal components clean and seals lubricated, preventing far more expensive problems down the road.