Generators can run on diesel, petrol, natural gas, LPG, or even dual-fuel—think of them as picky eaters with different tastes. Each fuel comes with its own perks and quirks. Stick around to find the one that keeps your lights on without blowing your budget.
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Generators are like cars—they all need fuel, but the type you choose changes how they perform. From budget-friendly petrol to the heavy-duty stamina of diesel, each fuel type brings something different to the table.
Knowing the pros and cons will help you pick a generator that suits your lifestyle, whether that's powering your shed in a blackout or keeping a construction site humming.
Petrol is the all-rounder in the generator world. You'll find it everywhere, from the local servo to the corner hardware shop. It's easy to use, starts quickly, and works well for short-term jobs or occasional blackouts.
Advantages:
Lower upfront cost than diesel.
Easy to source almost anywhere in Australia.
Starts smoothly, even on chilly mornings.
Disadvantages:
Wears out quicker under heavy use.
Fuel costs can stack up.
Petrol doesn't store well for long periods.
If you're running a petrol generator, stick to fresh, unleaded fuel with the right octane rating for your machine. Avoid hoarding petrol for too long—it can go stale in as little as six months, even with fuel stabiliser.
Diesel generators are built for the long haul. They're the sort you'll see on farms, building sites, and in big backup systems. They're not the cheapest to buy, but they'll pay you back in reliability and fuel savings.
Advantages:
Sips less fuel than petrol under load.
Longer engine lifespan with regular care.
Handles extended running times with ease.
Disadvantages:
Higher initial price tag.
Louder operation.
Can produce more emissions without the right tech.
Diesel keeps better than petrol—up to a year or more with additives—but it's not invincible. Water contamination and microbial growth can ruin it. Keep it in a cool, dry spot and rotate your supply to keep it fresh.
LPG is the neat freak of the fuel world—burns clean, stores for ages, and doesn't stink up the shed. It's a great choice if you live somewhere that struggles to get diesel or petrol deliveries.
Benefits:
Burns cleaner with fewer emissions.
Can be stored almost indefinitely.
Runs quieter than diesel.
Drawbacks:
Packs less punch per litre, so you'll use more.
Can struggle in extreme cold.
If you're hooked up to mains gas, you've got a fuel supply that never runs out. No jerry cans. No refuelling trips. Just turn it on and let it run.
Advantages:
Unlimited runtime with grid connection.
Cleaner burn than petrol or diesel.
Lower running costs in areas with cheap gas.
Disadvantages:
Fixed location—no taking it camping.
Slightly lower output than other fuels.
Relies on gas infrastructure.

Some generators go beyond single-fuel setups. These models give you options, so you're not stuck if one fuel source runs dry.
Tri-fuel generators can run on petrol, propane, or natural gas. Switching between them means you can always use what's available or cheapest at the time.
They're a solid option for households in remote areas or those who want serious emergency backup. You won't have to worry about a single supply chain hiccup leaving you powerless.
Dual-fuel generators—usually petrol and propane—offer the portability of petrol with the cleaner running of LPG. They're popular for caravans, camping, and small businesses that need flexible power options.
Biodiesel blends can be used in many diesel generators with little to no modification. It's a greener choice for those wanting to cut their carbon footprint.
Hydrogen generators and advanced hybrid systems are on the horizon. As tech improves, expect cleaner, more efficient fuels to become the norm.
Choosing the right fuel isn't just about price—it's about what works for your situation.
Load, fuel quality, maintenance, and even the weather can affect how much fuel your generator drinks.
For heavy, constant loads, diesel usually wins. Natural gas is great for low-cost, long-term use where supply is steady. LPG is king for long shelf life and clean operation.
In rural or high-demand situations, having a fuel delivery contract can save you from an inconvenient (and possibly expensive) blackout.
Only store fuel in approved containers, keep it in ventilated spaces, and follow the shelf life rules for each type. It's not just about performance—it's about safety.
Portable generators lean on petrol or LPG for easy transport. Standby units often run on natural gas or diesel for long-term reliability. Industrial units almost always use diesel for sheer endurance.

From the quick-start appeal of petrol to the rugged stamina of diesel, and the clean burn of propane, there's a fuel for every need. In Australia, your choice will often come down to what's easiest to get, what's affordable, and how you plan to use it.
Pick wisely, store it safely, and your generator will be ready to fire up when the lights go out—no drama.