When storm season ends, or you simply don’t need backup power for several months, knowing how to store a generator correctly can mean the difference between a unit that starts reliably next season and one that requires costly generator repairs. Proper off-season storage protects your investment, extends generator lifespan, and ensures your generator will be ready when you need it most.
Whether you own a portable generator for occasional use or a standby unit that sits idle during milder months, following the right storage procedures – along with knowing how to hook up a generator to your house – prevents fuel system damage, corrosion, and mechanical issues that commonly occur when generators sit unused.
How to Store a Generator: Preparation
Before putting your generator away for the season, thorough preparation is essential. Skipping these steps can lead to starting problems, damaged components, and reduced performance when you need backup power again.
Clean the Exterior
Start by removing dirt, debris, grass clippings, and any buildup from the generator’s exterior. Use a soft brush or cloth with mild soap and water to clean the unit. Pay special attention to cooling vents and air intake areas, as blockages can cause overheating issues. Allow the generator to dry completely before proceeding with other storage steps.
Inspect for Damage
Conduct a visual inspection looking for:
- Loose or damaged wiring
- Cracked fuel lines or fittings
- Oil leaks around the engine
- Worn or frayed belts
- Corroded battery terminals
- Damaged cooling fins
Address any generator repairs before storage rather than discovering problems when you need the generator in an emergency.
How to Store a Generator: Managing the Fuel System
The fuel system requires the most attention during storage preparation. Old fuel is the leading cause of starting problems for your generator and can damage carburetors, fuel lines, and injectors.
Option 1: Run the Generator Dry
For shorter storage periods (1-3 months), running the fuel tank dry is often the simplest solution. Turn off the fuel valve and let the generator run until it stops on its own. This removes fuel from the carburetor and fuel lines, preventing gum and varnish buildup.
Option 2: Add Fuel Stabilizer
For longer storage periods or if you prefer keeping fuel in the tank:
- Fill the tank to about 95% capacity to minimize air exposure
- Add the manufacturer-recommended amount of fuel stabilizer
- Run the generator for 10-15 minutes to circulate treated fuel through the system
- Turn off the fuel valve and let the unit run until it stops
Fuel stabilizer prevents oxidation and keeps gasoline fresh for 12-24 months depending on the product used.
How to Store a Generator: Engine Maintenance first
Change the Oil
Old oil contains contaminants and moisture that can cause corrosion during storage. Change the oil and filter according to your owner’s manual specifications. Fresh oil provides better protection for internal engine components during extended periods of inactivity.
Run the generator for a few minutes after the oil change to circulate the new oil throughout the engine, then shut it down and allow it to cool before storage.
Remove or Maintain the Battery
For generators with electric start systems:
- Remove the battery and store it in a cool, dry location
- Clean battery terminals with a wire brush to remove corrosion
- Charge the battery fully before storage
- Check the charge monthly and recharge as needed to prevent sulfation
- Apply a light coating of petroleum jelly to terminals to prevent corrosion
Alternatively, connect the battery to a maintenance charger designed for long-term storage.
Spark Plug Care
Remove the spark plug and inspect it for wear or carbon buildup. If it looks worn, replace it. For storage:
- Pour about a tablespoon of engine oil into the spark plug hole
- Pull the starter cord slowly several times to distribute oil on cylinder walls
- Reinstall the spark plug (don’t reconnect the wire)
This oil coating prevents rust formation inside the cylinder during storage.
How to Store a Generator: Storage Location
Indoor Storage Considerations
Storing your generator indoors provides the best protection from weather and temperature extremes. Ideal locations include:
- Garage or workshop with good ventilation
- Basement storage area (for smaller portable units)
- Shed or outbuilding with a solid roof
Ensure the storage area stays dry and maintains relatively stable temperatures. Never store a generator in living spaces due to potential carbon monoxide risks from residual fumes.
Outdoor Storage Precautions
If indoor storage isn’t available, outdoor storage requires additional protection:
- Use a weather-resistant generator cover designed for your model
- Elevate the unit on a platform to prevent ground moisture contact
- Position the generator away from areas prone to flooding
- Secure the cover to prevent wind damage
- Check periodically for water intrusion or pest activity
Avoid storing generators directly on concrete, as moisture can transfer from the ground and cause rust.
How to Store A Generator: Covering and Protecting
- Even in indoor locations, covering your generator provides extra protection:
- Use a breathable cover that allows air circulation
- Avoid plastic tarps that trap moisture
- Ensure the generator has cooled completely before covering
- Leave small openings for ventilation to prevent condensation
For areas with rodent activity, consider placing mothballs or rodent repellent near (not on) the generator, as mice and rats often nest in warm engine compartments and chew through wiring.
Pre-Season Restart Checklist
When it’s time to bring your generator back into service:
- Remove the cover and inspect for any damage or pest activity
- Check oil level and add if necessary
- Reconnect and install the battery
- Reconnect the spark plug wire
- Turn on the fuel valve (if you ran it dry)
- Check for proper ventilation in the operating area
- Start the generator and let it run for several minutes under no load
- Gradually add electrical load to test performance
How to Store a Generator: Professional Generator Storage and Maintenance Options
While many homeowners successfully handle generator storage themselves, professional maintenance ensures nothing gets overlooked. Trained technicians can perform comprehensive pre-storage servicing, identify potential problems before they become expensive repairs, and provide peace of mind that your generator will be ready when severe weather strikes.
Armstrong Specialties offers professional generator maintenance and storage preparation throughout Georgia. Our BBB-Accredited technicians service all major generator brands and can help extend the life of your equipment with proper off-season care. Contact us today for a free estimate on generator maintenance services.
