Mercedes Mullins
Mixing diesel fuel with gasoline is generally not advisable due to the potential for adverse effects on engine performance and fuel mileage. While some off-roaders in Iceland blend gasoline into their diesel fuel in winter for improved cold performance and power, others have reported higher fuel consumption, poor running, exhaust smoke, and excessive pinging on acceleration when diesel is added to gasoline. Additionally, the lower octane rating of diesel fuel, typically between 25 and 40, can cause a reduction in the octane rating of gasoline, leading to potential engine damage. Mixing diesel and gasoline can also result in incomplete combustion, characterised by large amounts of black smoke, and possible damage to the vehicle's computer sensors. Therefore, it is recommended to consult a mechanic if diesel and gasoline have been mixed, as they can safely remove and flush the contaminated fuel.
| Characteristics | Values |
|---|---|
| Mixing diesel and gasoline | Not advisable, but not necessarily a disaster |
| Biggest factor | The amount of each fuel mixed |
| Octane rating | Mixing 2% diesel fuel into gasoline will lower the overall octane rating by 1 point |
| Getting 10% diesel contamination lowers octane by 5 points, which is enough to create problems in most engines | |
| Octane depression rises linearly with increasing percentages of diesel fuel in gasoline | |
| Paraffin | May help lubrication but usually clogs up the fuel filter |
| Power and performance | Diesel in gasoline will reduce power and performance |
| Exhaust system | If unburned diesel fuel makes its way into the exhaust system, it will ignite in the catalytic converter and destroy it |
| Off-roaders in Iceland | Routinely blend 10-15% gas into their diesel in winter for better cold performance and power |
| Gasoline in diesel engine | Acceptable for cold weather when mixed at no more than 10% gasoline |
| Mixing gasoline and diesel in storage tanks | Was common practice in the 1990s in New England and Vermont |
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What You'll Learn
Mixing diesel and gasoline can cause engine damage
Mixing diesel and gasoline can have adverse effects on your vehicle's performance and, in some cases, even lead to engine damage. While it may not always result in a disaster, the extent of the issues depends on the proportion of each fuel in the mixture.
One of the primary concerns when diesel is mixed with gasoline is the reduction in octane rating. Gasoline requires an octane rating of 87-91 to function optimally in modern engines. Diesel fuel has a significantly lower octane rating, typically ranging from 25 to 40. Even a small amount of diesel contamination can lower the overall octane rating of the gasoline. For example, a mere 2% of diesel in gasoline can decrease the octane rating by one point. As the percentage of diesel increases, the octane rating drops further, leading to potential issues in most engines.
The decrease in octane rating can cause premature ignition of the gasoline, resulting in what is known as "knocking" or, more severely, damage to the piston and rod. This phenomenon occurs because gasoline with a lower octane rating ignites too quickly once injected into the chamber, leading to a collision with the piston that is still in its upward stroke.
Another issue arising from mixing diesel and gasoline is the difference in their densities. Diesel fuel is heavier than gasoline and tends to sink to the bottom of the gas tank. This can result in the injection of both fuels into the intake manifold or cylinder, leading to incomplete combustion. Incomplete combustion produces large amounts of black smoke and reduces engine power and performance. Additionally, the vehicle's computer may attempt to compensate by adjusting the fuel-air mixture, which can further decrease performance.
Furthermore, mixing diesel and gasoline can lead to issues with lubrication. Gasoline acts as a solvent, while diesel functions as an oil, providing lubrication to fuel pumps and injectors. The presence of gasoline reduces lubrication, potentially damaging the fuel pump and injectors.
While some individuals have reported mixing diesel and gasoline without major long-term problems, it is generally not recommended due to the potential risks involved. If you suspect that you have accidentally mixed diesel and gasoline in your vehicle, it is advisable to have it towed to a mechanic to remedy the situation and prevent potential engine damage.
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The percentage of each fuel in the mix will determine the issues caused
Mixing diesel fuel with gasoline is generally not advisable. The percentage of each fuel in the mix will determine the issues caused. For example, mixing 2% diesel fuel into gasoline will lower the overall octane rating by 1 point. Getting 10% diesel contamination lowers the octane by 5 points, which is enough to create problems in most engines. The octane depression rises linearly with increasing percentages of diesel fuel in the gasoline.
In addition, the presence of diesel in the gasoline can cause incomplete combustion, resulting in large amounts of black smoke. This can lead to the vehicle's computer attempting to compensate by adjusting the fuel-air mixture, resulting in reduced power and performance. Continued use of the contaminated fuel can also damage the vehicle's computer sensors by overheating them or covering them in soot.
Some off-roaders in Iceland routinely blend up to 15% gasoline into their diesel fuel in winter for better cold performance and power without any major issues. However, it is important to note that this practice may not be suitable for all engines, and the overall percentage of diesel and gasoline in the mix remains a critical factor in determining potential issues.
In the case of gasoline-powered boats, mixing diesel is strongly discouraged due to the risk of explosion and severe damage. The difficulty in uniformly mixing the two fuels and the vaporization of low-chain hydrocarbons in gasoline make it particularly dangerous for vessels without gasoline-specified equipment.
Therefore, while the percentage of each fuel in the mix is a critical factor, it is important to exercise caution and seek professional advice when dealing with any level of diesel and gasoline mixture.
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Mixing diesel and gasoline can reduce engine power and performance
Mixing diesel and gasoline can have adverse effects on engine power and performance. While gasoline engines use spark plugs to ignite the fuel, diesel engines compress the air first, making it hot enough to ignite the fuel without a spark. This makes diesel engines more efficient but also dirtier.
Mixing diesel with gasoline can lead to incomplete combustion, resulting in large amounts of black smoke. The vehicle's computer will try to compensate by adjusting the fuel-air mixture, leading to a significant reduction in power and performance. Additionally, the diesel-gasoline mixture can cause damage to the vehicle's computer sensors by overheating or covering them in soot.
The octane rating of gasoline, which measures its ability to ignite at the right time, is also affected by mixing in diesel fuel. Gasoline needs an octane rating of 87-91 to function in modern car engines, while diesel fuel typically has a rating of 25-40. Even a small amount of diesel contamination can lower the overall octane rating, leading to potential issues with engine performance.
Furthermore, due to its heavier composition, diesel fuel can sink to the bottom of the gas tank. This can result in the injection of both gas and diesel into the intake manifold or cylinder, causing partial combustion and leaving deposits on pistons, valves, and spark plugs. The result is a poorly running vehicle with reduced power and excessive smoke.
While some off-roaders blend a small percentage of gasoline into their diesel fuel during winter for better cold performance, it is generally not recommended to mix the two fuels. The paraffin in diesel may aid lubrication, but it often clogs the fuel filter. Therefore, mixing diesel and gasoline can negatively impact engine power and performance due to incomplete combustion, reduced octane ratings, and the formation of deposits.
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The octane rating of the gasoline will be lowered
Mixing diesel fuel with gasoline is generally not recommended. While it may not be a disaster, it can cause a number of issues, with the biggest factor being the amount of diesel mixed into gasoline. One of the main concerns is the reduction in the octane rating of the gasoline.
Octane rating is a standard measure of a fuel's ability to withstand compression in an internal combustion engine without causing engine knocking. The higher the octane rating, the more compression the fuel can withstand before detonating. The octane rating of gasoline is important as it measures the fuel's ability to ignite at the right time, not too early. Gasoline with a lower octane rating will ignite too quickly once injected into the chamber, causing a knocking sound at best, and damage to the piston and rod at worst.
Diesel fuel has an octane rating of 25-40, while gasoline needs to have an octane rating of 87-91 to fit today's car engines. Mixing diesel fuel with gasoline will lower the overall octane rating of the gasoline. For example, mixing 2% diesel fuel into gasoline will lower the overall octane rating by 1 point. A 10% diesel contamination lowers the octane by 5 points, which is enough to create problems in most engines. As the percentage of diesel fuel in the gasoline increases, the octane depression rises linearly.
The reduction in octane rating can lead to issues such as incomplete combustion, resulting in large amounts of black smoke. This can cause damage to the vehicle's computer sensors by either overheating them or covering them in soot. It can also affect the vehicle's performance, reducing power and fuel mileage.
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Mixing the fuels can cause incomplete combustion
Mixing diesel and gasoline is not advisable and can cause a range of problems for your vehicle. Firstly, gasoline needs to have an octane rating of 87-91 to fit today's car engines, whereas diesel fuel has an octane rating of 25-40. Mixing even a small amount of diesel fuel into gasoline will lower the overall octane rating, which can create problems in most engines.
Secondly, diesel fuel is heavier than gasoline and can sink to the bottom of your gas tank. This can result in the injection of both gas and diesel into the intake manifold or the cylinder, leading to partially burned diesel fuel and large amounts of black smoke. The vehicle's computer will try to compensate for this incomplete combustion by adjusting the fuel-air mixture, reducing power and performance. Continued use of the fuel can cause damage to the vehicle's computer sensors by either overheating them or covering them in soot.
Thirdly, the different combustion properties of diesel and gasoline can cause issues in diesel engines. Gasoline doesn't combust efficiently in diesel engines, causing irregular firing cycles and incomplete combustion. This results in a rough-running engine, noticeable through shaking, vibrations, or a lack of smooth operation. Incomplete combustion can also cause hot spots, leading to overheating and potential damage to cylinder walls, pistons, valves, and spark plugs.
Finally, mixing diesel and gasoline can cause issues with fuel injectors. Gasoline's chemical properties can affect the precision and ability of fuel injectors to deliver fuel correctly. It can also cause fuel filters to become clogged. Given these issues, it is important to avoid mixing diesel and gasoline and to seek professional help if you have accidentally mixed the two fuels.
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Frequently asked questions
Mixing diesel fuel with gasoline is generally not recommended. It will lower the octane rating of the gasoline, which can cause incomplete combustion and damage to the vehicle's computer sensors. It can also clog up the fuel filter and reduce power and fuel mileage.
Running diesel in a gasoline engine is not advisable. The diesel will ignite and explode, which can cause damage to the piston and rod. It will also reduce the octane rating of the gasoline, leading to potential engine damage.
While it's not ideal, a small amount of gasoline in a diesel engine is less likely to cause issues. In cold weather, up to 10% gasoline mixed with diesel can improve performance. However, larger amounts can cause problems, including higher fuel consumption, poor running, and excessive pinging on acceleration.
If you accidentally mix diesel fuel and gasoline, it is recommended to have your vehicle towed to a mechanic. They will be able to remove the contaminated fuel and flush the system to prevent further damage.
