Wondering if you can use kerosene in your diesel engine? While both are hydrocarbons, mixing kerosene with diesel can cause significant damage to your vehicle.
In this blog, we’ll break down the risks, potential consequences, and what to do if you’ve accidentally used kerosene. Read on to protect your engine!
Can You Put Kerosene in a Diesel Engine?
No, you shouldn’t put kerosene in a diesel engine. It can damage the engine, and fuel system, and cause poor performance. Always use the correct diesel fuel to ensure proper operation and longevity.
Key Takeaways:
- Kerosene is not designed for use in diesel engines and can cause significant damage.
- Adding kerosene can affect engine performance, fuel system components, and emissions.
- If kerosene is added by mistake, immediate action is needed to prevent long-term damage.
What is Kerosene and How is It Different from Diesel?
Before we dive into the consequences of using kerosene in a diesel engine, it’s important to understand the key differences between the two fuels.
Kerosene is a type of fuel primarily used in jet engines, heating systems, and some industrial applications. It is a lighter fuel than diesel and has a lower energy content.
Diesel is a heavier, more energy-dense fuel that is specifically designed for compression ignition engines, which are used in most trucks, buses, and other commercial vehicles. In such engines, components like ignition coils play a crucial role, and understanding the average lifespan of ignition coils is important for maintaining optimal performance and preventing unexpected breakdowns.
While both fuels come from similar sources and share some chemical properties, their characteristics differ significantly.
Diesel engines are designed to run on diesel fuel, which has a higher lubricity and energy content, allowing for proper combustion and efficient performance. Kerosene, however, lacks the necessary properties for optimal performance in a diesel engine.
Severe mechanical mistakes sometimes lead to major repairs, so understanding repair options for totaled cars can help you prepare.
Can You Put Kerosene in a Diesel Engine? A Detailed Overview
Technically, you can put kerosene in a diesel engine, but doing so is not recommended, and it can lead to serious engine issues.
Kerosene is much lighter and thinner than diesel fuel, and using it in your diesel vehicle can lead to the following problems:
Loss of Lubrication
Diesel fuel has higher lubricity than kerosene, which helps lubricate the fuel system, including the injectors, pumps, and other components.
Kerosene has much lower lubricating properties, and using it in a diesel engine can cause internal components to wear out faster. Over time, this can lead to damage to the fuel system and costly repairs.
Poor Combustion
Kerosene has a lower energy content and burns differently from diesel.
When you use kerosene in a diesel engine, it may not combust properly, which can cause poor engine performance, misfires, and difficulty starting the engine. The incomplete combustion can also result in higher emissions, potentially causing your vehicle to fail emissions tests.
Engine Damage

When kerosene is mixed with diesel, it can cause various engine problems, including clogged fuel filters, damaged injectors, and degraded seals.
The lower viscosity of kerosene can lead to improper fuel flow and cause damage to critical engine components. Over time, this can result in major engine malfunctions and expensive repairs.
You see here how diesel engine works to get an idea of what I’m talking about here.
Environmental Impact
The use of kerosene instead of diesel fuel may lead to higher emissions of unburned hydrocarbons and particulate matter.
This can harm the environment, especially in urban areas where air quality is already a concern. It can also cause your vehicle to fail environmental regulations, resulting in fines and penalties.
What to Do If You Accidentally Put Kerosene in Your Diesel Engine
Accidentally filling your diesel vehicle with kerosene can be a stressful situation, but it’s not the end of the world.
The most important thing is to act quickly to minimize potential damage and ensure the engine functions properly in the future.
Here’s a step-by-step guide on what to do if you’ve mistakenly put kerosene in your diesel engine.
1. Don’t Start the Engine
If you realize you’ve put kerosene in your diesel engine before starting the vehicle, your first priority is to avoid starting the engine.
Starting the engine could allow kerosene to flow through the fuel system, potentially damaging sensitive engine components such as fuel injectors, fuel pumps, and filters.
If the vehicle has already been started, immediately turn off the engine to prevent further contamination of the system.
The sooner you stop the engine, the less likely you are to cause significant damage to the internal parts of the vehicle.
2. Drain the Fuel Tank

The next critical step is to drain the fuel tank completely.
Kerosene is a much thinner liquid than diesel, which means it will not combust properly and can cause serious damage if left in the system.
It’s essential to remove all traces of kerosene from the fuel tank to ensure the engine runs on the correct fuel.
This task is best handled by a professional and certified mechanic or at a service station, as they have the necessary tools and experience to safely drain the tank without causing harm to the vehicle or its components.
They will remove the contaminated fuel and prepare the tank for flushing.
3. Flush the Fuel System
Once the fuel tank is drained, the fuel system needs to be flushed to remove any residual kerosene from the system.
This step is crucial because even a small amount of kerosene in the fuel lines, injectors, or fuel pump can lead to improper combustion, poor engine performance, or even engine failure.
A professional will flush out the injectors, pumps, and filters to ensure that no traces of kerosene remain.
Flushing the fuel system also helps prevent clogging and contamination of the engine, ensuring that it continues to operate efficiently and without issues once refueled.
4. Refill with Diesel
Once the fuel system is thoroughly cleaned, the next step is to refill the tank with fresh diesel fuel.
After the tank is filled, start the engine and let it run for a few minutes to ensure everything is functioning correctly.
At this point, your vehicle should be good to go, but it’s a good idea to keep an eye on its performance for the next few days.
Watch for any unusual behavior, such as rough idling, poor acceleration, or engine misfires.
If you notice any performance issues, it could indicate that there are still some remnants of kerosene in the system or that damage was caused before you turned off the engine.
5. Consult a Professional Mechanic

If you’re unsure about the situation, or if the vehicle continues to show signs of poor performance after draining the kerosene and refilling with diesel, it’s advisable to consult a professional mechanic.
A mechanic will be able to thoroughly inspect the engine and fuel system, checking for any potential damage caused by the kerosene.
They can also ensure that everything is functioning properly, from the fuel injectors to the fuel pump, and make any necessary repairs.
It’s better to be safe and have an expert confirm that your vehicle is running smoothly than risk long-term engine issues from undetected damage.
How to Prevent Accidental Kerosene Use in Diesel Engines
To avoid the risk of using the wrong fuel in your diesel engine, here are a few preventive steps you can take:
Label the Fuel Cap
Clearly label your diesel fuel cap to indicate that only diesel fuel should be used.
This simple step can help avoid confusion and ensure that no one accidentally puts kerosene or other fuels into the tank.
Be Cautious at Fuel Stations
When refueling, always double-check the fuel nozzle to ensure that you’re using the correct fuel type.
Some fuel stations have separate pumps for diesel and kerosene, so make sure you select the right one.
Keep Kerosene Away from the Vehicle
If you use kerosene for other purposes, such as heating or industrial equipment, store it separately from your diesel vehicle’s fuel. This will reduce the chances of mixing up the fuels.
Frequently Asked Questions
1. Can you put kerosene in a diesel engine?
While you can technically put kerosene in a diesel engine, it’s not recommended. Kerosene lacks the necessary lubricating properties and combustion characteristics required for optimal diesel engine performance.
2. What happens if you put kerosene in a diesel engine?
Putting kerosene in a diesel engine can cause poor engine performance, fuel system damage, and potential engine failure due to improper combustion and lack of lubrication.
3. What should I do if I accidentally put kerosene in my diesel vehicle?
If you realize you’ve used kerosene, don’t start the engine. Drain the fuel tank, flush the system, and refill with diesel. Consult a mechanic if necessary to ensure proper function and avoid damage.
Conclusion
While kerosene and diesel fuel might seem similar, they are designed for different purposes, and using kerosene in a diesel engine can lead to significant issues.
From damaging fuel system components to causing poor engine performance, the risks of using kerosene far outweigh any potential benefits. If you accidentally put kerosene in your diesel vehicle, it’s crucial to act quickly and get the fuel system drained and cleaned to prevent lasting damage.
Regular maintenance and attention to fuel types can help ensure that your diesel engine runs efficiently and avoids costly repairs.
