What Is the 20-20-20 Rule for Generators?
Sick of your generator chucking a tantrum when you actually need it?
The 20-20-20 rule is your no-fuss maintenance cheat sheet: run it 20 minutes monthly, use 20% load, service every 20 hours. Easy. Want it to last longer and start every time? Keep reading.
The 20-20-20 Rule for Portable Generators
Portable generators are the go-to for camping trips, job sites, and power outages. But they don’t like being ignored. That’s where the 20-20-20 rule comes in.
This simple method keeps your generator running sweet — without all the drama. Here’s how it works:
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Run it for 20 minutes every month to keep the fuel fresh and the engine ticking over
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Use at least a 20% load when running it, so the engine doesn’t wear out from going too easy
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Do a quick service every 20 hours of use — oil check, filter, the basics
It’s like giving your generator a bit of regular exercise and a check-up, so it’s ready to go when things go pear-shaped.
A Guide to Portable Generator Safety
Looking after your generator’s one thing. Keeping yourself and everyone around you safe is another.
Even the best generator setup can turn dangerous if you’re not thinking about safety.
Generator Placement and Carbon Monoxide
Rule number one: never run your generator indoors or in enclosed spaces.
That includes sheds, garages, tents, and under awnings with poor airflow.
Carbon monoxide is a silent killer. You can’t smell it. You can’t see it. And it builds up fast.
Always keep your generator at least six metres away from your camp or home. Make sure the exhaust’s facing away from people, doors, and windows.
Understanding the Risks of Carbon Monoxide
You might feel dizzy, get a headache, or feel a bit off. That’s not just heat or tiredness — it could be CO poisoning.
It only takes a few minutes of exposure to put you in serious danger.
If anyone feels crook while the generator’s running, shut it off straight away and get into fresh air. Don’t muck around.
The Importance of a Generator Cooldown Period
Ever topped up the mower too soon and nearly started a backyard fire? Same deal here — never refuel a hot generator.
Even if it looks safe, the fuel vapour can ignite if it hits a hot engine or exhaust pipe.
Steps for Safe Refuelling
Here’s what you do:
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Turn off the generator
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Let it cool for 10–15 minutes
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Use proper fuel containers — no old paint tins or dodgy jerry cans
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Pour carefully, and avoid spills
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Clean up any drips before you start it again
Doesn’t take long, but it could save your shed, your gear — even your life.
Investing in a Carbon Monoxide Generator
We’re not talking about a new kind of generator here.
We’re talking about grabbing a decent carbon monoxide alarm if you’re running a gen near where people sleep or work.
Caravans, campsites, workshops — all should have one.
What to Look for in a Carbon Monoxide Alarm
Look for one that’s:
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Battery-powered
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Has a loud alarm (so it’ll wake you)
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Easy to test with a single button
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Optional: one with a digital display to show CO levels
Mount it near where people are sleeping — not up high, not hidden in a drawer.
And for the love of your future self, test it once a month.
General Maintenance for Your Generators
The 20-20-20 rule keeps your gen in good nick, but don’t stop there.
Seasonal check-ups, a proper clean, and smart storage will keep things running smooth and avoid “why won’t this bloody thing start?” moments.
Pre-Season Generator Checklist
Before storm season or that big road trip, give your generator a once-over.
Think of it like checking your ute before a long haul — you wouldn’t hit the road without checking the oil and tyres, right?
Cleaning and Inspecting the Generator
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Wipe it down — dust and moisture build up fast
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Check for rust, cracked hoses, or loose screws
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Look at your air filter — clean or replace if it’s full of junk
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Keep an eye out for oil or fuel leaks
A clean generator runs better, cooler, and lasts longer.
Engine Oil and Spark Plug Replacement
Change the oil every 20 to 50 hours, depending on how hard it’s working. Use the grade recommended in your manual — usually 10W-30 for Aussie conditions.
Pull the spark plug and check it every 100 hours. If it’s black and gunky, replace it. Easy job, big difference.
Storing Your Generator for Long-Term Use
Not using your gen for a while? Store it right or you’ll regret it next time you try to fire it up.
Proper Fuel Storage
You’ve got two options:
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Add a fuel stabiliser and run the gen for a few minutes to cycle it through
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Or drain the tank completely and run the carb dry
Either way, store it off the ground, in a dry spot with ventilation. Don’t wrap it up too tight — it still needs airflow to avoid moisture build-up.
Bonus tip: write the last fuel date on a bit of tape and stick it to the tank. Future you will thank you.
Troubleshooting Common Generator Issues
Even the best gear can play up now and then. Here's a quick rundown of the usual culprits.
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Won’t start? Could be old fuel, dead battery, dirty spark plug, or blocked air filter.
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Surging or sputtering? Check the fuel quality and clean the carburettor.
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Cuts out mid-run? Oil might be low, or you’ve tripped the overload.
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Running hot? Clean out dust and debris — airflow is everything.
Still no luck? Stop cranking it. You’ll flood the engine and make things worse.
Check your warranty or take it to someone who knows their way around small engines.
You might also like:
- Are Generators Allowed on Fraser Island?
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- Can You Take a Generator Camping?
- How Do I Protect My Generator from Lightning?
- What Generators Are Made in Canada?
- Are Generators Affected by Extreme Weather?
- What Is Voltage Sag or Brownout Caused by Generators?
