The short answer
Start it, run it under load outdoors, check oil and fuel, and stabilize or rotate gasoline. Follow your manual first — maintenance intervals and oil grades are the maker's to specify.
The routine
- Read the manual's maintenance schedule and keep the maker's recommended oil and spark plug on hand.
- Check oil level and condition before every start.
- Run the generator outdoors for 15–30 minutes under a real load (a space heater or work light) so you see how it behaves; confirm the outlets and breakers work.
- Inspect cords and connectors for damage; confirm the cord reaches a safe outdoor location.
- Keep a small kit: spare plug, funnel, oil, work gloves, a fire extinguisher and battery-powered CO alarms.
Fuel
- Gasoline degrades over months; ethanol-blended gasoline degrades faster. Fuel stabilizer extends life; rotating stock into a car and refilling keeps it fresh.
- Propane does not degrade the way gasoline does, but tanks, hoses and regulators need inspection.
- Natural gas connections should be made and checked by a qualified person.
- Store fuel only in approved containers, outdoors or in a detached space, away from ignition sources and living areas, within local limits.
Estimate how much you need with the fuel calculator.
Between uses
Store the generator dry and covered, with fuel handled as the manual directs (some makers specify running the carburetor dry or draining the tank for long storage; others specify stabilizer). Never store it inside a living space with fuel in it.
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