Guide 101 · Generator
How much gasoline to store for a portable generator, and how to keep it fresh
Store enough fuel for the hours you plan to run each day, times the days you expect to be without power. Use the burn rate from your generator's own chart at your load. Then rotate it: date every can, add stabilizer, and use the oldest fuel in your car before it goes stale.
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The verdict
Choose a generator whose maker publishes fuel use or run time at partial load, and size your gas supply from that chart at your actual load, not from the run time in a listing headline.
See the store linkWhat we check
- Published fuel use at your load
- Tank size and run time per tank
- Economy mode for light loads
- Approved, sealed fuel containers
- Fuel stabilizer and ethanol content
- Local limits on stored gasoline
Drawing of backup power equipment.
Store link Generator
Honda EU2200i 2200 Watt Inverter Generator (EU2200ITAN) | Super Quiet 120V Gas Powered Portable Generator for Camping or Home Backup Power Supply, Up to 8.1 Hour Run Time
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Generator safety: carbon monoxide and backfeed
Carbon monoxide: never run a generator indoors, in a garage, basement or crawlspace, or near windows, doors or vents. Using a generator indoors can kill you in minutes. Use battery-powered carbon monoxide alarms in the home. CPSC Safety Alert 5123
Backfeed: never plug a generator into a wall outlet or a dryer outlet. That is extremely dangerous: it can energize utility lines and injure line workers and people in the home. Use a transfer switch or interlock installed by a licensed electrician. CPSC Safety Alert 5123 (PDF)
Work out how much fuel you need
Your fuel need depends on how hard the generator works, so start with your load. Add up the running watts of what you plan to power, using each device's label, the maker's spec page, or a plug-in watt meter. Then find that load on the generator maker's fuel consumption or run time chart, usually in the owner's manual.
For example, if your generator's chart shows half a gallon per hour at your load and you plan to run it 8 hours a day for 3 days, you need 12 gallons before any margin. Running in blocks instead of around the clock makes the same fuel last longer.
Store only what you can rotate within the storage time your stabilizer label claims. A smaller supply you refresh on schedule beats a large one that sits past that window.
- List the devices you will run and their running watts.
- Read the burn rate at that load from the maker's chart.
- Decide how many hours a day you will run the generator.
- Multiply by the number of days you want to cover.
- Add a margin, then round to the number of cans you can store safely.
How long stored gasoline lasts
Untreated gasoline starts to break down within months. Ethanol blends can absorb moisture and separate, and stale fuel can gum up a small engine's carburetor so it won't start when you need it.
A fuel stabilizer added when you fill the can slows that breakdown. Follow the stabilizer's label for the dose and for how long it claims to protect fuel. If ethanol-free gasoline is sold near you, check your generator manual to see whether the maker recommends it or lists any fuel limits.
A rotation routine that keeps fuel usable
Rotation means you never store any one batch of gas long enough for it to go bad. You use the old fuel in something that runs often and replace it with fresh fuel.
- Write the fill date on each can with a marker or label.
- Add stabilizer right after filling the can, while the fuel is still fresh.
- Set a calendar reminder based on your stabilizer's stated storage time.
- Pour the oldest can into your car or mower, after checking that it meets that engine's fuel requirements.
- Refill the empty can and move it to the back of the line.
- Top off your cans when a storm is forecast.
Store gasoline safely
Keep gas in containers made and labeled for gasoline, with their caps closed. Leave room for expansion instead of filling to the brim. Keep the cans out of direct sun and outside your living space, ideally in a detached shed. Keep them away from water heaters, furnaces, pilot lights, and anything else that can spark.
Your local fire code, lease, HOA rules, or insurance policy may limit how much gasoline you can keep and where. Check those before you build a supply.
When the power is out, never run a generator indoors, in a garage, or near windows, doors, or vents, because exhaust carries carbon monoxide. Shut the generator off and let it cool before refueling.
What to check on the generator itself
On the generator, look for a published fuel use or run time chart at partial load, the tank size, and an economy mode that lowers engine speed at light loads. Also look at how the maker tells you to prepare the generator for storage, such as a fuel shutoff or carburetor drain.
The linked Honda EU2200i lists a maximum run time in its title. Treat that as a headline figure. Check the maker's chart for run time at your own load, and confirm separate running and starting ratings on the spec sheet.
Connecting any generator to house wiring takes a transfer switch or interlock installed by a licensed electrician. Ask your electrician which generator outlet type your setup needs. If storing gasoline isn't practical where you live, a dual-fuel or propane generator may suit you better.
Sources
Recorded AI check: Nov 1, 2026. The sources below may include later additions. AI checks compare factual numbers and checkable claims with web sources; they do not verify every statement.
- Portable Generator Fuel Storage | Norwall
- How to select the right backup generator - Backwoods Home Magazine
- Fuel Storage for Generators: Safety Tips and Best Practices
- Portable Generator Fuel Storage Guide for Safety - Champion Baltic
- How to Store Gasoline for Emergency Generator Use
Best inverter generator for a home outage compares units from the makers' numbers. Every guide in this class is in Portable generators.
How this guide was made
- Drafted and checked with AI. An AI model wrote the draft from the guide's topic. A second AI pass looked for factual numbers to check against web sources. This does not verify every statement. A draft that fails the check is held for review.
- Fact-checked by the HoldBackup editorial team. On , a person on the HoldBackup editorial team reviewed this guide against its sources. That is a review of the writing, not a test of any unit.
- General guidance only. No prices, rankings, or test results, because we have none to back them. Check any number against the maker's own spec sheet.
- No lab tests, and we say so. HoldBackup has not run any unit named here.
- The store link is not a pick for this guide. It goes to a unit in this product class that this guide does not review. Check it against the list above before you buy.
- Labelled store links. A store button goes straight to Amazon with HoldBackup's affiliate tag. HoldBackup counts the click. A live button carries a "paid link" label, and the disclosure sits above the first one on every guide.
Questions
Should I leave gas in the generator between outages?
Follow your owner's manual. Some makers say to add stabilizer and run the engine so treated fuel reaches the carburetor. Others say to drain the carburetor or run it dry. The right method depends on the model.
How often should I rotate stored gasoline?
Base the schedule on the storage time your stabilizer's label claims, and rotate sooner if the cans sit somewhere hot. Use a fixed seasonal reminder so you do not forget.
Can I use gas that has been sitting too long?
If it smells sour, looks darker than fresh fuel, or shows a separate layer, don't put it in the generator. Ask your local household hazardous waste program how to dispose of it.
How much gasoline am I allowed to store at home?
It depends on where you live. Check your local fire department or fire code, and read your lease, HOA rules, and insurance policy before storing more than a can or two.
Where does the price button go?
Straight to Amazon. Amazon sets the price and availability, and both can change.
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