Generator Maintenance Checklist: What to Do Before Storm Season

Generator maintenance is easy to put off because nothing seems wrong until the moment you need it. A storm-season checklist turns a vague intention into specific tasks on specific dates, with the supplies already in the garage. This checklist is organized by timing: what to do six weeks out, two weeks out, and in the 48 hours before a storm is forecast to hit. It covers service items, the spare parts worth stocking, fuel planning and household safety gear, so the only thing left to do when the power goes out is roll the generator into place.

Six weeks before the season

This is the main service window, early enough to get parts or professional help if something is wrong.

Engine service

• Change the oil, even if the generator ran only a few hours last year. Oil degrades over time as well as with use.
• Inspect or replace the air filter. Foam elements can be washed and lightly re-oiled per the manual; paper elements should be replaced if dirty.
• Remove and inspect the spark plug. Replace it if the electrode is worn, fouled or covered in deposits. Check the gap with a feeler gauge.
• Check the fuel filter and fuel lines for cracks or brittleness.
• Clean the spark arrestor screen if equipped; carbon buildup reduces performance.

Electrical and structural

• Inspect outlets, the control panel and the frame for corrosion or damage.
• Test the battery on electric-start units with a voltmeter; a healthy 12V battery reads about 12.6V at rest. Charge or replace it as needed.
• Check tires, handles and wheel kits for damage.

Book a pro if needed

Standby generators should get their annual professional service now, before technicians get booked solid. For portables, schedule shop work if the unit surged, smoked or would not start last season.

Two weeks before the season

Fuel and supplies

• Refresh fuel: rotate stored gasoline into a vehicle, refill cans with fresh fuel and stabilizer.
• Fill or exchange propane cylinders for dual-fuel units and inspect the regulator hose.
• Stock oil for at least three to four oil changes; long outages mean changes every 50 to 100 hours.

Recommended spares and supplies

Functional test

Run the generator for 30 to 60 minutes under a real load, check voltage and frequency, and rehearse your transfer switch or interlock sequence. Fix anything that is off now.

Household safety checks

• Test every carbon monoxide alarm and replace batteries. Add alarms near every sleeping area if missing.
• Confirm your generator location is at least 20 feet from the house with exhaust pointed away from doors, windows and vents. Mark it so family members know where it goes. Never a garage, carport or porch.
• Check the fire extinguisher near fuel storage.
• Post a one-page instruction sheet near the panel: startup steps, which breakers to turn on, and how to switch back.
• If you do not have a transfer switch or interlock kit, schedule a licensed electrician. Never plan to backfeed through an outlet.

48 hours before a forecast storm

• Top up the generator’s fuel tank and fill any empty cans.
• Charge the electric-start battery and any power stations, phones and lanterns.
• Clear the path from storage to the generator’s operating spot.
• Stage cords, the running cover, oil and tools together.
• Turn the fridge and freezer to their coldest settings to build a thermal buffer.
• Start the generator briefly to confirm it runs, then shut it down.

FAQ

Should I change generator oil every year even with low hours?

Yes. Oil absorbs moisture and combustion byproducts over time, and additives break down. An annual change before storm season is cheap insurance, even if the hour meter barely moved.

What is the most common reason generators fail at the start of storm season?

Stale fuel in the carburetor. Stabilizing fuel, running the generator monthly or draining it for storage prevents most of these failures.

Bottom line

Service the engine six weeks out, stock fuel and spares two weeks out, and stage everything in the 48 hours before a storm. Test CO alarms, confirm safe placement, and make sure a proper transfer switch or interlock is in place. A generator that is serviced, fueled and rehearsed is the difference between an inconvenience and an emergency.