Regan Brown
Putting diesel in a gasoline car is a common mistake, but it can be costly. While diesel and gasoline are both derived from crude oil, they have different physical properties, and an engine that operates with one type of fuel is not compatible with the other. If you realise your mistake while still at the pump, and have put in less than 5% of your tank's capacity, you may be able to drive, although your car will perform poorly. However, if you've put in more than 5%, do not start your car under any circumstances. Have your vehicle towed to a garage to have the diesel fuel drained and the tank flushed. If diesel has entered the fuel line or engine, vulnerable parts like the catalytic converter, fuel pump and fuel injector may be impacted, and the repair job can easily climb into the thousands.
What happens if you fuel your car with diesel?
| Characteristics | Values |
|---|---|
| Impact on the car | The car will run poorly, make a lot of noises, and then the engine will die. |
| Impact on the fuel lines | Fuel lines will get clogged. |
| Impact on the spark plugs | Spark plugs will get wet and oily. |
| Impact on the engine | Engine will stall. |
| Impact on the fuel injector | Fuel injector will get damaged. |
| Impact on the fuel pump | Fuel pump will get damaged. |
| Impact on the catalytic converter | Catalytic converter will get damaged. |
| Action to be taken | Do not start the car. Get it towed to a repair shop to get the diesel drained and the fuel tank rinsed. |
| Cost of repair | Depending on the damage, the cost of repair can be anywhere from $200 to $3,210. |
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What You'll Learn
The car may slow down and start bucking
If you put diesel in a gasoline car, the car will likely stall and the engine will misfire as soon as the diesel reaches the intake system. This is because diesel is thicker and more viscous than gasoline, which can clog and damage a gasoline engine's components, such as the fuel lines, filters, and pumps. The car may slow down and start bucking as a result of the clogged fuel lines.
The severity of the issue depends on the amount of diesel that has been added to the gasoline tank. If it is a tiny amount (less than 5% of the tank's capacity), the car will still run, but it will perform poorly until the diesel gets diluted by refueling with gasoline. However, if a significant amount of diesel has been added, the engine will make loud noises, produce low power, and eventually die. This is because the diesel will quickly clog the fuel lines, causing the car to slow down and buck.
In this situation, it is crucial not to start the engine or turn the key in the ignition, as this could activate the fuel pump and cause further complications. The best course of action is to have the vehicle towed to a repair shop or dealership, where a mechanic can drain and rinse the gas tank to remove the diesel and its residue. This process can vary in cost depending on the specific vehicle and labor rates in the region. Additionally, the fuel lines and other affected components may need to be serviced or replaced, further increasing the overall repair cost.
To prevent such issues in the future, it is important to pay attention at the pump and ensure that the correct type of fuel is being dispensed. Diesel pumps are typically labeled with green handles or nozzles, and the diesel fuel itself has a distinct kerosene-like smell. By being vigilant and checking for these signs, you can avoid mistakenly putting diesel into a gasoline car.
Furthermore, it is worth noting that while putting diesel in a gasoline car can have negative consequences, the reverse situation of putting gasoline in a diesel engine can be even more detrimental. Gasoline can cause serious damage to a diesel engine, so extra caution should be exercised to avoid mixing up the two types of fuel.
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The fuel pump and fuel filter may need replacing
If you accidentally put diesel in your gas tank, it is important to act quickly and not start your vehicle under any circumstances. Diesel fuel is thicker and more viscous than gasoline, and it can cause significant damage to your fuel pump and fuel filter, leading to costly repairs.
The fuel pump is a critical component of your vehicle's fuel system, responsible for delivering fuel from the tank to the engine. When diesel fuel is introduced to a gasoline engine, it can clog the fuel pump and cause it to malfunction. In some cases, the fuel pump may become completely seized, requiring a costly replacement. The process of replacing the fuel pump can be complex and time-consuming, and the cost can range from $220 to $1,110, including labour.
The fuel filter is another vital component of the fuel system, responsible for removing impurities from the fuel before it enters the engine. When diesel fuel is used in a gasoline engine, it can clog the fuel filter, preventing it from effectively removing contaminants. A clogged fuel filter can lead to reduced engine performance, increased fuel consumption, and, in severe cases, engine damage. The cost of replacing the fuel filter can range from $200 to $500, depending on the vehicle and labour rates in your region.
To minimise the potential damage to the fuel pump and fuel filter, it is crucial to have your vehicle towed to a garage or repair shop immediately. A mechanic will be able to drain and rinse the gas tank to remove the diesel fuel and its residue. They may also recommend replacing the fuel pump and fuel filter, especially if they have been extensively damaged by the diesel fuel.
It is important to note that attempting to drive your vehicle with diesel in the gas tank can cause the diesel to reach the intake system, clogging the fuel lines and causing further damage to the engine. Therefore, it is always best to seek professional assistance as soon as you realise your mistake.
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The engine may stop working
If you put diesel in a gasoline-powered car, the engine may stop working. Diesel is thicker and more viscous than gasoline, so it can clog and damage a gasoline engine's injection system and other components. Vulnerable parts include the catalytic converter, fuel pump, and fuel injector. If the diesel fuel has entered the fuel line or engine, the repair job can easily climb into the thousands.
If you realize your mistake while still at the pump and have only put a tiny amount in (less than 5% of your fuel tank capacity), you might still be okay to drive, although the car will perform poorly. If you've put in more than 5%, do not start your car. Have it towed to a shop that can drain the fuel and replace it with new gasoline.
If you don't realize your mistake until you've set off, your car will stall within a mile or two once your fuel lines get clogged. In this case, you will also need to have your car towed to a repair shop to have the diesel drained and the tank rinsed with fresh gasoline.
The cost of resolving the issue depends on how quickly you respond to the situation. Draining the tank could cost anywhere from $200 to $500, depending on whether the tank needs to be dropped and how much diesel is present. Towing the vehicle will add about $100 to the total, although this may be covered by a roadside assistance program such as AAA.
It's important to note that gasoline and diesel are different types of fuel, and an engine that operates with one type is not compatible with the other fuel. Mixing the two fuels is not dangerous, but diesel is toxic to gasoline fuel systems. Professional attention and specialized treatment are required to flush out and remove the toxins.
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The fuel system may get clogged
If the diesel reaches the intake system, it will cause the engine to stall and potentially clog the fuel lines. The more viscous diesel fuel can also damage the engine's injection system and other components. Vulnerable parts include the catalytic converter, fuel pump, and fuel injector. The catalytic converter is responsible for reducing emissions, and if it is damaged, it can be costly to replace. The fuel pump and injector are also expensive to replace, with the total repair bill for these three parts ranging from $1,320 to $3,210.
The likelihood of the fuel system getting clogged depends on the amount of diesel that has been added to the gasoline tank. If it is just a tiny amount, the car will run poorly until the diesel gets diluted by refueling with gasoline. However, if a significant amount of diesel has been added, the engine will make low power, make a lot of noises, and then die. This is because the diesel will quickly clog up the fuel lines.
If you realize your mistake while still at the pump, it is important not to start your car. Have it towed to a shop that can drain the diesel fuel and replace it with fresh gasoline. The cost of resolving the issue depends on how quickly you respond and whether the gas tank needs to be removed to be drained. Draining the tank can cost anywhere from $200 to $500, while towing the vehicle can add about $100 to the total.
It is important to note that diesel in a gasoline car is not as serious as gasoline in a diesel engine, which can cause significant damage to the engine.
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The diesel must be diluted or removed
If you've accidentally put diesel in a gasoline-powered car, it is important to act quickly. Diesel is thicker and more viscous than gasoline, so it can clog and damage a gasoline engine and its components. The first thing to do is to not start the engine. If you do, the diesel will enter the fuel lines and the engine system, causing significant damage and making the repair process more complicated and expensive.
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 be able to drive your car, although it will perform poorly. You should then fill up the rest of the tank with unleaded gasoline and continue to top it off regularly to dilute the diesel.
If you have put more than 5% diesel in your tank, do not attempt to drive the car. Instead, arrange for your vehicle to be towed to a garage or repair shop, where a mechanic will be able to drain and rinse the gas tank to remove the diesel and its residue. This process can cost anywhere from $200 to $500, depending on whether the tank needs to be removed and how much diesel is present. Towing the vehicle will add to the total cost, although this may be covered by your roadside assistance program.
If there is a removable drain on the gas tank, the mechanic will simply open the drain and empty the entire amount of the gasoline/diesel mixture. If there is no removable drain, the tank will need to be removed from the vehicle and drained. The mechanic will then rinse the tank repeatedly with fresh gasoline until all the diesel fuel is washed out.
It is important to note that mixing diesel and gasoline is not, by itself, dangerous. However, the hardest part of the process is disposing of the diesel/gasoline mix that is removed from the car, so it is important to plan for this in advance.
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Frequently asked questions
First, do not start the car under any circumstances. If you are still at the pump, you don't have to worry. However, if you have driven the car, you will need to get it towed to a garage to have the diesel drained.
If you start the car, the diesel will enter the fuel line and engine system, which will make the repair process far more complicated and costly. Vulnerable parts include the catalytic converter, fuel pump, and fuel injector.
You can tell if you added diesel to the gas by sniffing at the tailpipe, which will smell like diesel. Additionally, if you pull out a spark plug, it will be wet and oily and smell strongly of diesel.
You will need to have all of the diesel fuel removed from the tank and add fresh gasoline. The more gas you add, the better, as you want to dilute the diesel as much as possible.
