Do you put E10 in your car (it’s always cheapest, after all), but you’re not completely sure how it is any different to unleaded fuel?


Let’s go through some E10 fuel facts and figure out exactly what is e10 fuel and if it is the best juice for your car.


What is e10 fuel?

what is e10 fuel


To understand E10 fuel, we need to first understand what ethanol is (scientists, you can zone out for this one).


Ethanol is a clear, volatile flammable liquid made from the natural fermentation of sugar or and starch from plants, including sugar cane, corn, wheat, barley, and sorghum – yep, it’s actually alcohol (…but different, please don’t try and run your car with a bottle of vodka).


Great… but what is e10 fuel!?

what is e10 fuel


E10 FUEL FACT: E10 fuel is just as its name suggests – 10% ethanol. The other 90% is your good ol’ regular unleaded petrol.


What are e10 fuel compatible cars?

what is e10 fuel


E10 FUEL FACT: E10 is commonly used in modern cars (made after 1986) and is compatible with the majority of petrol-powered cars.


However, it’s still important to check before you first fill up with e10 to avoid any damage to your car! You can find this information in your car-user manual, but (thank you, Google) we have the Internet nowadays and there are quick e10 compatibility checks online, such as E10 Fuel For Thought.

Should I use e10 in my car?

what is e10 fuel


For a new car, you might prefer premium unleaded – is has a higher octane rating and that means better performance.


E10 FUEL FACT: E10 can be safely used in many cars (remember to refer to the link in the above paragraph) and will not cause damage to your car if it is compatible.


Premium fuel also (usually) contains cleaning additives that clean your engine as you drive! If you are driving a modern car, it may require premium unleaded (check out the inside of your fuel flap), but can still run on E10 if you mistakenly put it in, though I’d always recommend to follow the manufacture’s guidelines.

Can you mix e10 and unleaded?

what is e10 fuel


Remember when we discussed what is E10 fuel, we noted it is made up of 90% conventional unleaded petrol – so it is fine to mix e10 and other unleaded petrol (as long as your car can run on e10 in the first place).


Don’t think you need to live on the edge of that fuel light before filling up to avoid mixing them!


Is e10 fuel better for the environment?

Yes! You can learn more about this at e10 The Good Fuel.

E10 FUEL FACT: e10 reduces harmful emissions by up to 30%.

When we found out what is E10 fuel, we spoke about it being converted starch and sugars. These are often used from leftover farming products – e.g. leftover starch from wheat that has been turned into flour. This is great for Aussie farmers as it adds value to agricultural crops… plus, it’s sustainable!

E10 in an old car – yes or no?

Cars made before 1986 can’t handle their liquor and you can’t use e10 in these models.


E10 FUEL FACT: In cars made before ’86 the ethanol can case the rubber seals and hoses to fail and cause engine failure.


E10, regular, premium – mileage vs price. What is the verdict?

what is e10 fuel


There is a hot debate across car forums surrounding the big question – is E10 fuel better for your car and wallet than mid-range and performance fuel?


In terms of price, efficiency fluctuates with cost of fuel (check out ways to reduce your fuel bill here). While e10 is always the cheaper option, the 10% ethanol means it burns faster than 91, 95, and 98 (premium) fuel – in both city and highway driving.


The NRMA stated that this difference is minimal, though, so unless you want premium for its performance and cleaning qualities I would say e10 will suit you just fine!


That’s a wrap for going over what is E10 fuel and e10 fuel facts – hopefully you now have a better idea of what e10 is and if it will work for your car!


In the market for new fuel system components? Check out our range of Fuel System parts and products from leading brands like Fuelmiser and AFI (Australian Fuel Injection).

The carburettor can seem like a complicated device on the surface, treated by many contemporary mechanics as outdated and a bit of a lost art. Because of this, carburettors fall victim to a lot of myths such as its inefficiency, difficulty and unreliability.
Set up properly though, a carburettor can be almost every bit as good as electronic fuel injection. Carburettors are something I’m personally quite passionate about and I hope to provide a basic understanding on how they work in a simplistic sense.


The Word Carburettor comes from the word Buretta, meaning “A Measured Dose of fluid” and also the word for the glass syringes often used to measure Volume. A Car-Buretta is simply a device for a car that administers a measured dose of fluid, in this case fuel. In The Following examples I will be using the Weber DCOE Carburettor as an example due to its popularity and simplicity.


Spares Box Carburettor


A carburettor contains various passages or “Circuits” to provide varying amounts of fuel depending on Throttle Position, Load, and RPM. It is important to remember that there is a difference between Vacuum and the Absence of pressure. Atmospheric Air Pressure is roughly 14.7Psi. Vacuum is negative pressure, where as the absence of pressure is anything between 0 psi and 14.7 psi.


One key feature of the carburettor is the “Venturi”: a tapered Bore which acts as a bottle neck. The throttle butterfly connected to the accelerator Pedal is located within this tapered bore. As the Piston within the engine travels downwards and the exhaust valve opens its creates an area of lower pressure than atmospheric inside the intake runner. Atmospheric pressure pushes the air down the Venturi and into the cylinder.


As the air is forced into a smaller opening, it speeds up. This is referred to as the Venturi effect. The Weber carburettor contains 2. A main Venturi and Auxiliary Venturi . The Auxiliary Venturi is a smaller one that sits within the main Venturi. This is to aid atomisation and distribution of the air/fuel mixture when air speed is very low.


Spares Box Carburettor


Within the carburettor is an “Idle Jet” this receives fuel from within a small drilling. A Jet is the term given to the Brass nozzles within a carburettor that govern the amount of fuel delivered. The end of this jet is exposed to the air travelling through the Venturi. The air moving quickly over the end of the jet creates a negative pressure area and the fuel within the carburettor “float Bowl” is drawn through the jet which atomises the fuel, Mixing it with the air. The sizes of these jets can be changed to allow more or less fuel. The Idle Jet (along with progression ports) are responsible for the air/fuel mixture up to about 2000rpm.


You can actually test this at home. By filling a glass with water and placing a straw in it. By blowing across the top of the straw at the right angle you can actually watch the water get drawn up the straw and atomised. Below you can see the Auxiliary Venturi within the Main Venturi. The main jet’s supply can be seen protruding within this.


Spares Box Carburettor


The Float Bowl is simply a chamber that retains fuel for use by the carburettor. It receives Fuel supplied via the fuel pump. Within it is a Float that open and closes a Needle and seat valve so to maintain correct fuel level within the bowl. Float height and effectively fuel level can be altered and is a key part in correctly tuning a Carburettor.


After this point air speed drops and the Idle Circuit ceases to work. The Emulsion Tube is the next part of a basic carburettor. Located central of the DCOE weber carburettor It has an Air Correction Jet at one end and the “Main Jet” at the other. Atmospheric pressure forces the Fuel into the Emulsion tube and atmospheric air pressure supplies air to the Air Jet at the other end. Both are Fed through holes drilled in the side of the emulsion tube and supplied to the Choke Venturi. This controls the air/fuel mixture for higher engine speeds. There is a series of wholes on the side of the emulsion tube, at idle, the holes are covered by the fuel level and no air can pass through them, as engine speed increases the fuel level drops and the holes are progressively uncovered, allowing air to fix with the fuel and pass though.


Spares Box Carburettor


In addition to these Circuits the Carburettor has an Accelerator Pump. Literally a Diaphragm pump connected to the throttle butterfly via an internal linkage. This is to provide a momentary additional fuel supply when the accelerator pedal is quickly depressed. It receives Fuel from within the Float Bowl via the Accelerator pump jet.


A common Misconception with carburettors is they require frequent retuning. This is a common misconception. Mixture screws are held in place by springs. If your carburettor is mounted Via Rubber gaskets and these springs are in good condition your car should not require adjustment very often. If you have purchased second hand carburettors it is always worth replacing the gaskets and cleaning it out as well as replacing these springs to ensure trouble free motoring. I have solid mounted weber carburettors before on weekend cars and race cars, and while It performs quite well, Though  the vibrations caused can lend themselves to the car slipping out of tune.


Spares Box Carburettor


There is a lot more to the Carburettor, and tuning should always be left to an experienced Mechanic. Hopefully This article has served to provide a basic understanding of the carburettors workings.


If you’re interested in more traditional fuel injection components, peruse our collections from leading brands like Fuelmiser.

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