Mercedes Mullins
Putting the wrong fuel in your car is a common mistake that can have serious consequences. If you realise your mistake before starting the car, do not turn on the engine. Call for a tow truck and have the car taken to a mechanic or auto repair service, who will drain the incorrect fuel from the tank and flush the system. If you have used a small amount of the wrong fuel, filling the rest of the tank with the correct fuel may prevent any significant harm. However, if you have used a significant amount of the wrong fuel, you should seek professional help. The cost of repair can be significant, and in some cases, the engine may need to be replaced entirely.
Consequences of Using the Wrong Fuel in a Car
| Characteristics | Values |
|---|---|
| Engine damage | Engine knocking or pinging, incomplete combustion, misfires, poor combustion, unusual noises, reduced performance, decreased fuel economy, engine stalling |
| Fuel system issues | Clogged fuel injectors, clogged fuel filters, damaged fuel lines, damaged fuel pump |
| Environmental impact | Increased hydrocarbon emissions, higher carbon monoxide emissions, release of nitrogen oxides |
| Financial impact | Cost of repairs can be significant, ranging from $200 to $2000 for a full flush |
| Preventative measures | Double-check fuel type, pay attention at the pump, consider a misfuelling prevention device |
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What You'll Learn
The wrong fuel type can cause engine damage
Putting the wrong fuel type in your car can have serious consequences, and it's a surprisingly common mistake. It's important to act quickly and effectively to resolve the issue, as failure to do so could cause lasting damage to your vehicle.
If you put the wrong fuel type in your car, the engine will not be able to process it and will not run correctly. The wrong fuel can also damage other parts of the car, including the fuel system, the spark plugs, and the catalytic converter. Even a small amount of the wrong fuel can cause issues, and the vehicle may stutter, misfire, lose power, or stall. If you've put diesel into a petrol engine, the petrol will gush into the internal parts of the engine, causing extensive damage as it has no lubricating properties.
If you realise your mistake before starting the car, do not turn the engine on or touch the ignition, as this will spread contaminated fuel throughout the fuel system and engine. Get professional help to flush the system and drain the tank. If you've only added a small amount of premium fuel to a regular tank, or vice versa, you may be able to avoid any resulting damage or financial costs.
If you've put diesel into a petrol engine, or vice versa, your vehicle's fuel is now poisonous to its engine, and the entire system is at risk of contamination. Professional attention and specialised treatment are required to flush out and remove the toxins. If you've put high-octane fuel into an engine that needs low-octane fuel, the engine will still run, but power will be reduced, and fuel economy may decrease.
To prevent putting the wrong fuel in your car, pay attention at the pump and eliminate distractions. Review each button and nozzle carefully to ensure you know which fuel type you are choosing. Check your vehicle's manual or look up its specifications online to determine the correct fuel type.
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Diesel in a petrol car will increase friction and damage the fuel pump
Putting the wrong fuel in your car is a common mistake that can have serious consequences. Diesel fuel pumps operate on very fine tolerances at high pressures and are lubricated by diesel fuel. Diesel in a petrol car will increase friction and damage the fuel pump. This is because diesel has solvent properties that eliminate the lubrication effect, causing the metal surfaces of the pump to grind together and create internal friction. The fuel pump will then begin to disintegrate, creating swarf, or microscopic particles of metal, that can cause further damage to the engine.
If you realize your mistake before leaving the service station, do not start the vehicle, as this will circulate the contaminated fuel through the system. You will need to call a breakdown service to tow your car to a service center where they can drain the tank. If you have driven away before realizing your mistake, stop the car as soon as possible and turn off the engine to minimize damage. Attempting to siphon the fuel from the tank is not recommended, as it is unsafe and harmful to the environment.
To prevent misfuelling, you can purchase aftermarket devices that prevent petrol from being inserted into a diesel tank, such as a diesel fuel tank insert that refuses gas nozzles. Alternatively, you can apply a sticker inside the filler door or on the filler cap to remind you of the correct fuel type.
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Petrol in a diesel car will cause extensive engine damage
Putting the wrong fuel in your car is a serious issue that can have costly consequences. While it is possible to accidentally mix up to 5% of petrol in a diesel tank without causing damage, anything more than this can be extremely problematic.
If you realise your mistake while filling up, do not start the engine or turn the key in the ignition, as this will spread contaminated fuel throughout the system. Get the tank drained and flushed as soon as possible. If you have driven the car, even a very short distance, you will need to get the fuel lines and engine cleaned and flushed, which is a more complicated and expensive process.
The best way to avoid this issue is to ensure you are familiar with your car's fuel requirements and to eliminate distractions when filling up.
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Misfuelling is common, especially with diesel cars
Misfuelling is a common mistake that any motorist can make. In the UK, it is estimated that every three to four minutes, a driver fills their car with the wrong fuel. The risk of misfuelling has increased recently, as many drivers are turning away from diesel vehicles.
Misfuelling is especially common with diesel cars, as diesel engines are more sensitive than gasoline engines. Diesel vehicles can only run on diesel, whereas gasoline cars can typically run on any type of gasoline, as long as it meets the minimum octane rating specified by the manufacturer. Gasoline engines do not have a high enough compression ratio to ignite diesel fuel, so even a small amount of diesel in a gasoline engine will cause the vehicle to run poorly.
Additionally, diesel acts as a lubricant for engines, while petrol is a solvent. If petrol circulates through a diesel engine, it can cause damage to the injectors, fuel lines, filters, and pump. Petrol's corrosive qualities may also degrade seals in a diesel system.
To prevent misfuelling a diesel vehicle, small, inexpensive devices can be installed onto the filler cap, preventing the insertion of a petrol nozzle.
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If you realise your mistake before starting the car, get the system flushed
If you realise your mistake before starting the car, consider yourself lucky and act quickly. The first thing to do is to not start the engine. Do not turn on the ignition. The next step is to call for help and have your car towed to a mechanic or auto repair service. A professional will then need to drain the incorrect fuel from the tank and flush the system.
It is important to get the system flushed as soon as possible, as long-term damage can occur if the wrong fuel circulates through the fuel system. For example, if you accidentally put diesel in a gas car, the thicker, oilier diesel can clog the fuel injectors and filters. If the engine is started, the car might run poorly, produce excessive smoke, and eventually stall. Similarly, putting gasoline in a diesel car is a serious mistake as diesel engines rely on diesel fuel's lubricating properties, which gasoline lacks. Without this lubrication, parts of the engine may grind together and cause significant damage.
The process of flushing the system will involve a professional mechanic draining the fuel tank, flushing the fuel system, and replacing any damaged components such as fuel pumps or injectors. This process can be costly and stressful, but it is important to get it done as soon as possible to minimise damage and get back on the road.
In some cases, you may be able to dilute the wrong fuel with the correct fuel to avoid flushing the system. For example, if you have a small amount of diesel in a gasoline tank, you may be able to fill the tank with gasoline to dilute the diesel to a concentration that won't cause harm. However, it is always best to consult a professional for advice and guidance.
Additionally, if your vehicle has an electric fuel pump, you can use a fuel system cleaner to clear any sediment buildup or blockage. These cleaners can be purchased at a relatively low cost, and you simply pour them into your tank when you have a certain amount of fuel, as instructed on the bottle. After adding the cleaner, you should let the engine idle for 10-15 minutes to allow the cleaner to flow through the system before driving your car as normal.
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Frequently asked questions
If you realise your mistake before starting the engine, do not turn on the ignition. Call for a tow service to transport your car to a mechanic or auto repair shop. A professional will need to drain the incorrect fuel and flush the system.
If you start the engine, the car might run poorly, produce excessive smoke, and eventually stall. Long-term damage can occur if the wrong fuel circulates through the fuel system, necessitating extensive and costly repairs.
Symptoms of using the wrong fuel include unusual engine noises, reduced performance, engine misfires, knocking or pinging noises, and a check engine light.
Putting premium fuel in a car that takes regular fuel generally doesn't cause harm. You may experience reduced performance and decreased fuel economy, but your car probably won't sustain lasting engine damage. Simply switch back to regular fuel as soon as possible.
