Sylvie Willis
Putting diesel fuel in a car with a gasoline engine is a common mistake, but it can have serious consequences. While it's unlikely to cause immediate damage, it can still be a costly error. Diesel is thicker and more viscous than gasoline, so it can clog up a gasoline engine's fuel lines, filters, and pumps, causing the vehicle to stall or not start at all. If you realise your mistake while still at the pump, you may be able to avoid issues by filling the rest of the tank with unleaded gasoline. However, if you've put more than 5% diesel in your tank, it's vital not to start your car. Instead, call a dealership or repair shop to have the diesel drained and the tank cleaned.
What happens if you put diesel fuel in a car?
| Characteristics | Values |
|---|---|
| Engine damage | Diesel in a gas engine will cause the car to stall as soon as diesel reaches the intake system, potentially clogging the fuel lines and damaging the engine. |
| Fuel injectors and spark plugs | Diesel will clog the fuel injectors and spark plugs. |
| Vehicle performance | The vehicle may misfire, stall, or not start at all. |
| Fuel system | Diesel can clog the fuel system. |
| Catalytic converter | Unburned diesel can reach the exhaust system and damage the catalytic converter. |
| Fuel filter | Diesel can gum up the fuel filter. |
| Fuel pumps | Diesel can gum up the fuel pumps. |
| Cost of repairs | Depending on the severity of the problem, repairs can cost a few hundred dollars to over a thousand dollars. |
| Fuel drainage | If diesel has been put in a gas car, it is important to not start the engine and get the vehicle towed to a garage for fuel drainage. |
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What You'll Learn
What to do if you put diesel in a gas car
Putting diesel in a gasoline-powered car can lead to serious engine damage. Diesel is thicker and more viscous than gasoline, which means it can clog and damage a gasoline engine's components. The amount of diesel that has entered the gas tank and whether the engine was started will determine the extent of the damage. If you realise your mistake while still at the pump and have only put a tiny amount in (less than 5% of your fuel tank capacity), you may still be able to drive your car, although it will perform poorly. However, anything more than 5% could cause issues like misfiring and clogged fuel lines.
If you have put more than 5% of your tank's capacity in, and are still at the pump, it is vital not to start your car. Instead, call a dealership or a repair shop immediately and arrange for an emergency tow to get your vehicle to the service center. A mechanic will then drain and clean the tank to remove the diesel and its residue. If you don't realise your mistake until you have set off down the road, your car will stall within a mile or two once your fuel lines get clogged. If you have driven the car with diesel in the tank, further repairs may be necessary, including flushing the fuel line, servicing the fuel injector system, and replacing the fuel filter and spark plugs.
To avoid putting diesel in a gasoline-powered car, pay attention at the pump and don't pick up handles with a "Diesel" label. Diesel pumps typically have green handles and larger nozzles, and diesel smells different from gasoline, so be vigilant and check for these signs before filling up.
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Potential damage to the engine and other components
Putting diesel in a gasoline-powered car can lead to serious engine damage. Diesel is thicker and more viscous than gasoline, which means it can clog and damage a gasoline engine's components. The extent of the damage depends on the amount of diesel in the tank and the amount of gasoline already present.
If you realise your mistake while still at the pump and have only put a tiny amount of diesel in (less than 5% of your fuel tank capacity), you may still be able to drive your car, although it will perform poorly. However, anything more than 5% could cause issues like misfiring and clogged fuel lines. If you have put more than 5% of diesel in your tank, do not start your car. Instead, have it towed to a shop that can drain the fuel and replace it with new gasoline.
If you start your car with diesel in the tank, the diesel will clog the fuel injectors and spark plugs, and the vehicle may misfire, stall, or not start at all. The diesel can also damage the catalytic converter, the component responsible for reducing emissions. The cost of repairs will vary depending on labour rates, the type of car, and the severity of the problem.
If you have driven your car with diesel in the tank, a service centre will need to remove the diesel fuel from the fuel lines, injectors, and fuel rail. If this does not solve the problem, a technician may need to take apart other components of the system, which can be an extensive and costly process.
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Cost of repairs
The cost of repairs for putting diesel fuel in a gasoline-powered car can vary depending on several factors, including the labour rates of the mechanic, the type of car, and the severity of the issue. In some cases, it may only cost a few hundred dollars, including the cost of towing the vehicle to a repair shop and draining the fuel tank. However, if other components are damaged, the cost of repairs can quickly escalate.
One of the most important factors influencing the cost of repairs is the amount of diesel fuel that has been added to the gasoline tank. If the tank was nearly full of gasoline and only a small amount of diesel was added, the impact may be minimal, with the car still able to run, albeit with reduced performance. On the other hand, if a larger proportion of diesel is introduced, the car may not start at all due to diesel's different combustion properties.
The severity of the issue also plays a significant role in determining the cost of repairs. In some cases, simply draining and flushing the fuel system may be sufficient. However, if the diesel fuel has entered the fuel lines, injectors, and engine system, the repair process becomes more complicated and expensive. Additionally, if the diesel has caused damage to specific components, such as the fuel pump, fuel injector, or catalytic converter, the replacement cost for these parts can range from a few hundred to over a thousand dollars each.
The type of car can also impact the cost of repairs, with luxury or high-end vehicles typically being more expensive to fix due to the specialised nature of their components. Furthermore, the labour rates of the mechanic or repair shop can vary, affecting the overall cost of the repairs.
It is worth noting that while putting diesel fuel in a gasoline car can result in costly repairs, it is unlikely to cause catastrophic damage to the engine. However, it is crucial to act quickly and not start the vehicle to prevent the diesel from entering the fuel lines and causing further complications.
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How to prevent putting diesel in a gas car
Putting diesel in a gas-powered car can lead to serious engine damage. Diesel is thicker and more viscous than gasoline, which means it can clog and damage a gas engine's components. Therefore, it is important to know how to prevent putting diesel in a gas car. Here are some tips to help you avoid this costly mistake:
Be Cautious at the Pump: Pay attention when filling up your car. Look out for labels and handles with the word "Diesel" on them, and avoid selecting those pumps. Typically, diesel pumps have green handles and larger nozzles, providing a visual clue to differentiate them from gasoline pumps.
Check the Nozzle Size: Diesel nozzles are usually larger than gasoline nozzles. If you're having trouble fitting the nozzle into your car's filler hole, you may be holding a diesel nozzle. The vehicle's gasoline filler neck and the diesel fuel nozzle are designed to be incompatible, so the diesel nozzle should not easily fit into a gasoline filler neck.
Smell the Fuel: Diesel has a distinct odour, similar to kerosene, while gasoline smells more like paint thinner. If you own both gas and diesel vehicles, pay extra attention to this difference to ensure you're using the correct fuel for each car.
Check the Grade: Ensure that the button that is lit up on the pump shows a grade of unleaded gasoline. This is an additional way to confirm you are selecting the correct fuel type for your vehicle.
Stay Vigilant: Human error is the primary reason for diesel ending up in gas tanks. Stay alert and double-check the fuel type before pumping. This is especially important if you are driving someone else's car, as it can be easier to fill in the wrong fuel in such cases.
By following these precautions, you can significantly reduce the risk of putting diesel in your gas-powered car and avoid the costly and complicated repairs that may result from this mistake.
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Differences between diesel and gasoline
Putting diesel in a gasoline car is a mistake that can lead to serious engine damage. Diesel is thicker and more viscous than gasoline, which means it can clog and damage a gasoline engine's components. If you accidentally put diesel in your gasoline car, it is important that you do not start the engine. Instead, call a dealership or repair shop for help. They will drain and clean the tank to remove the diesel and its residue.
Now, let's delve into the differences between diesel and gasoline:
Diesel and gasoline are derived from crude oil but differ in their refining processes. Gasoline undergoes a more extensive refining process, resulting in a thinner and more combustible fuel. Diesel, on the other hand, is thicker and slower-burning. It has a higher density and energy density, which contributes to its higher fuel efficiency. Diesel engines can achieve up to 20% better fuel economy than gasoline engines. Additionally, diesel engines have a longer lifespan, often lasting over a million miles, thanks to their removable cylinder liners.
In terms of engine operation, gasoline engines use spark plugs to ignite the fuel, while diesel engines rely on compression to ignite the fuel. This compression combustion gives diesel engines a higher torque generation, making them well-suited for towing and hauling heavy loads. Diesel engines operate at lower RPMs but offer higher torque, making them ideal for heavy machinery, trucks, buses, and agricultural equipment. Gasoline engines, on the other hand, offer higher power and RPMs, making them a better fit for passenger cars, SUVs, and light-duty trucks where speed and rapid acceleration are required.
The two fuels also differ in their emissions. Gasoline engines typically burn cleaner, with carbon dioxide as their main emission, while diesel engines produce more polluting emissions, including nitrogen oxides, sulphur oxides, and particulates, which contribute to poor air quality.
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Frequently asked questions
Putting diesel in a car that is not diesel-powered can lead to serious engine damage. Diesel is thicker and more viscous than gasoline, which can clog and damage a gas engine’s components. It is crucial not to start the engine and to call a dealership or repair shop for help.
If you put diesel in a car that is not diesel-powered, do not start the engine. Call a dealership or repair shop immediately and have the vehicle towed to their service center. A mechanic will drain and clean the gas tank to remove the diesel and its residue.
If you drive a car that is not diesel-powered after putting diesel in it, the diesel will clog the fuel injectors and spark plugs. The vehicle may misfire, stall, or not start at all. The repair cost can be high, depending on the damage.
To avoid putting diesel in a car that is not diesel-powered, pay attention at the pump. Diesel pumps usually have green handles and larger nozzles, and diesel smells different from gasoline. Check the label on the fuel door or the owner's manual to confirm the correct fuel type.
Putting gasoline in a diesel car can also be problematic. Gasoline has high combustion tendencies and will ignite much sooner than diesel fuel. This early ignition and volatility could cause catastrophic damage to the diesel engine and its components.
