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How to Store a Generator for Winter

Last updated:

Fact-checked by James Witkowski, ASE Certified Technician, 12 years small engine and generator repair.

Key Takeaways

  • For storage under 3 months, add fuel stabilizer and run for 5 minutes. For longer storage, drain fuel completely.
  • Change the oil before storage — old oil can corrode engine components during winter.
  • Disconnect and charge the battery for electric-start models; use a battery tender to maintain charge.
  • Store in a dry, well-ventilated area away from living spaces with a breathable cover, not plastic.
  • In spring, check oil, reconnect the battery, and clean the carburetor if the generator does not start after 5 pulls.

How to winterize your generator

To store a generator for winter: add fuel stabilizer to a full tank and run for 5 minutes (or drain fuel completely), change the oil, disconnect and charge the battery, clean or replace the air filter, and store in a dry, well-ventilated area with a breathable cover. Never store with fuel in a living space or basement.
  1. 1. Stabilize or drain fuel. Add fuel stabilizer to a full tank and run for 5 minutes, or drain completely and run the carburetor dry.
  2. 2. Change the oil. Remove contaminants before storage. Old oil can corrode engine components.
  3. 3. Disconnect the battery. For electric-start models, disconnect and store in a cool, dry place with a battery tender.
  4. 4. Clean the air filter. Clean or replace to prevent dust and debris issues during spring startup.
  5. 5. Store in a dry area. Store in a dry, well-ventilated area away from living spaces. Cover with a breathable cover.

Frequently Asked Questions

How do I store my generator for winter?
To store a generator for winter: (1) Add fuel stabilizer to a full tank and run for 5 minutes, or drain the fuel completely, (2) Change the oil, (3) Remove and charge the battery for electric-start models, (4) Clean or replace the air filter, (5) Store in a dry, well-ventilated area, (6) Cover with a breathable cover (not plastic).
Should I drain gasoline or use fuel stabilizer for storage?
For storage under 3 months, add fuel stabilizer to a full tank and run the engine for 5 minutes to circulate it. For storage over 3 months, drain the fuel completely and run the carburetor dry. Fuel stabilizer extends gasoline life to 6 to 12 months; without it, gasoline goes bad in 3 to 6 months.
Can I leave gas in my generator over winter?
You can leave gas in your generator over winter if you add fuel stabilizer and run the engine for 5 minutes to circulate it through the carburetor. Without stabilizer, gasoline degrades in 3 to 6 months and can clog the carburetor with varnish deposits. For storage longer than 6 months, drain the fuel completely.
Should I disconnect the battery when storing my generator?
Yes. For electric-start generators, disconnect the battery and store it in a cool, dry place. Use a battery tender to maintain charge during storage. A disconnected battery that is not maintained will lose charge over winter and may not start the generator in spring.
Where should I store my portable generator?
Store your portable generator in a dry, well-ventilated area away from living spaces — a shed, garage (with fuel removed), or covered storage. Never store a generator with fuel in a living space or basement. Cover with a breathable generator cover, not a plastic tarp, to prevent moisture buildup and corrosion.
How do I start my generator after winter storage?
To start a generator after winter storage: (1) Check the oil and fuel, (2) Reconnect and charge the battery, (3) Replace the spark plug if corroded, (4) Clean the air filter, (5) If fuel was left in, add fresh stabilizer, (6) Pull the starter cord slowly until you feel compression, then pull sharply. If it does not start after 5 pulls, clean the carburetor.