Mercedes Mullins
Putting the wrong substance in your diesel fuel tank can have serious consequences for your engine. One of the worst things to put in diesel fuel is DEF fluid, which can cause irreversible damage to the fuel system and engine. Other substances such as sugar, water, and gasoline can also cause issues, although they may not be as detrimental as DEF fluid. It is important to be cautious when filling up your diesel tank to avoid any accidental contamination, which can lead to costly repairs.
| Characteristics | Values |
|---|---|
| Petrol in a diesel engine | May cause damage to the engine and its components, ignite at the wrong time, or cause clogs in the fuel system |
| Diesel in a petrol engine | May damage the catalytic converter, create excessive pressure and heat, and reduce performance and power |
| DEF fluid | Likely to ruin the fuel system and possibly the engine |
| Sugar | May cause damage if not caught immediately |
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What You'll Learn
- Bleach can cause fuel tank leaks, as it makes steel and iron rust
- Sugar can block the fuel filter and cause the car to run roughly
- Salt crystals can obstruct the fuel filter, preventing the engine from starting
- Water can cause engine misfires, overheating, slow acceleration, and complete engine failure
- Urine can damage the engine, especially in higher quantities
Bleach can cause fuel tank leaks, as it makes steel and iron rust
Bleach is one of the worst things that you can put in a diesel fuel tank. Firstly, because bleach is mostly water, it settles at the bottom of the tank, causing significant performance issues. Secondly, when the chlorine in bleach mixes with the fuel, it reacts immediately, becoming a corrosive oxidizer and turning the fuel it contacts with mostly inert. This will cause the engine to struggle to stay running or run poorly.
The corrosive mixture will also cause the steel and iron components of the engine to rust. As demonstrated in an experiment on the show MythBusters, a gas tank filled with bleach was entirely rusted the very next day. This rust will eventually work its way through the tank and to other components, including fuel lines and cylinder heads. If left unattended, this can lead to clogged fuel filters and dangerous fuel leaks.
Therefore, if you suspect that someone has poured bleach into your diesel fuel tank, it is essential to take preventive measures. This may include purchasing a locking gas cap or periodically inspecting your gas cap for any signs of tampering. Additionally, comprehensive insurance coverage may help protect against such vandalism.
It is worth noting that while bleach can cause significant damage, it may not completely destroy the engine. Draining the tank and flushing it out with fresh fuel can help mitigate the issue if caught early. However, in some cases, professional repair or replacement of rusted components may be necessary.
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Sugar can block the fuel filter and cause the car to run roughly
Sugar is a well-known saboteur when it comes to diesel fuel. It has a reputation for causing issues in car engines, with a myth circulating since the 1950s that it can destroy them. While this myth is not entirely accurate, sugar can still wreak havoc on your car's fuel system and cause significant problems.
The myth likely originated from the fact that older cars in the 1950s had mechanical fuel pumps that were more susceptible to clogging by sugar. Sugar does not dissolve in gasoline; instead, it sinks to the bottom of the fuel tank. This means that even if you have a partial tank of diesel, the sugar will simply accumulate at the bottom, creating a sludge-like substance. While this may not directly damage the engine, it can lead to issues with the fuel pump by restricting the flow of fuel.
The fuel filter is designed to protect the engine by filtering out any impurities or debris, including sugar particles. However, if enough sugar accumulates, it can clog the fuel filter, limiting fuel flow to the engine. This, in turn, can cause poor engine performance, stalling, power surges, and even difficulty starting the car. If the sugar bypasses the fuel filter, it can proceed to the fuel injectors, potentially blocking them and further disrupting the delivery of fuel to the engine.
While modern cars have advanced filtration systems, it is still possible for sugar to cause issues. If you suspect that sugar has been added to your diesel fuel, it is important to have your car inspected by a mechanic. They can clean out the tank and address any damage caused by the sugar, such as replacing fuel filters or injectors. The cost of repairs can vary depending on the extent of the damage, ranging from a few hundred dollars to several thousand.
In conclusion, while sugar may not completely destroy your engine, it can cause significant issues with your diesel fuel system. It is essential to be vigilant and seek professional help if you suspect any sabotage or unusual behaviour from your vehicle.
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Salt crystals can obstruct the fuel filter, preventing the engine from starting
Salt crystals in the fuel tank can cause several issues with the engine. Salt crystals can enter the fuel tank through the air filter, as salt air is pulled in through the air intake. This can happen when the previous owner may have left the fuel cap loose, allowing sea water to enter the tank vents. Salt crystals can also be the result of fuel contamination, as salt water can enter through the tank vents during a turbo wash or when the boat is docked in salt water.
A blocked fuel filter can cause symptoms such as restricted fuel supply to the engine, reduced fuel pressure, and decreased power output. The "Check Engine" light may also illuminate, indicating a "P0171 System Too Lean" code, which suggests that the fuel injectors are not receiving enough pressurized fuel.
To address salt crystal obstruction in the fuel filter, it is recommended to drain the fuel tank and inspect the tank vents for proper installation. It is also important to periodically change the fuel filter and check for any debris or contamination. Additionally, filling up at reputable fuel retailers and using fuel additives can help maintain fuel quality and reduce the risk of crystallization.
In summary, salt crystals in the fuel tank can cause issues with the fuel filter, leading to engine problems. Proper maintenance, including regular fuel filter changes and tank inspections, is crucial to prevent salt crystal buildup and ensure optimal engine performance.
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Water can cause engine misfires, overheating, slow acceleration, and complete engine failure
Water is one of the worst things you can add to a diesel engine. While diesel engines are designed to withstand small amounts of water, larger amounts can cause significant issues. Water can enter the engine through the intake or exhaust, and driving through deep water or floods can cause this to happen.
Water can cause engine misfires by disrupting the ignition system and fuel system. The ignition system relies on spark plugs and ignition coils to ignite the fuel-air mixture in the cylinders. Water can cause these components to malfunction or fail, resulting in misfires. Similarly, water can clog fuel injectors or fuel filters, leading to insufficient fuel delivery to the cylinders and subsequent misfires.
Water can also lead to engine overheating. The cooling system in a car uses a water pump to circulate coolant around the engine, maintaining optimal temperatures. When the water pump malfunctions or fails, the coolant flow is disrupted, causing the engine to overheat. Driving with an overheated engine can cause irreparable damage, including warped cylinder heads and cracked engine blocks.
Additionally, water can cause slow acceleration. When driving through water, it is crucial to maintain a slow and steady speed to avoid splashing water into the engine's intake. Driving too fast can increase the likelihood of water entering the intake, potentially leading to engine flooding and hydrolock, which occurs when water enters the cylinders and prevents combustion.
In conclusion, while small amounts of water may not immediately impact diesel engine performance, larger quantities can lead to engine misfires, overheating, slow acceleration, and even complete engine failure. It is essential to address any issues related to water contamination promptly and ensure that the engine is properly maintained to mitigate potential damage.
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Urine can damage the engine, especially in higher quantities
While urine may not be the worst thing you can put in a diesel fuel tank, it can certainly damage the engine, especially in higher quantities.
Urine contains urea, a colourless and odourless substance also found in certain foods and plants. In diesel engines, urea is injected into the exhaust stream to reduce nitrogen oxide (NOx) emissions, a chemical compound that contributes to air pollution and acid rain. Urea converts NOx into water vapour and carbon dioxide, reducing emissions by up to 90%. This process occurs within a catalytic converter under high temperatures.
However, too much urea can be detrimental. It is important to only use fuels recommended by the manufacturer for each model year/make/model (MYM) of the vehicle, so you don't overload it with too much urea or other additives. Overloading with urea can cause damage to the engine over time.
Additionally, the use of urine as a source of urea may introduce other contaminants into the fuel system. Urine contains other chemicals and impurities that are not present in pure urea, which could potentially cause issues with the engine's performance and longevity.
Therefore, while urine may contain urea, which is beneficial for diesel engines in controlled quantities, the use of urine as a source of urea is not advisable due to the potential for engine damage and the introduction of other contaminants. It is always best to use high-quality fuels recommended by the manufacturer and to maintain the engine with regular servicing to ensure optimal performance and longevity.
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Frequently asked questions
The worst things to put in diesel fuel include bleach, soda, water, hydrogen peroxide, sugar, salt, and brake fluid.
Bleach can cause the fuel tank to start leaking fuel. This is because the chemical composition of bleach causes steel and iron to rust.
Sugar doesn't melt in diesel fuel, so it accumulates and blocks the fuel filter. This causes the car to run rough.
Water can cause engine misfires, overheating, slow acceleration, white steam from the exhaust, and complete engine failure.
Putting the wrong fuel in your diesel car can lead to the fuel igniting incorrectly and running rough. It can also deteriorate the seals and gaskets in the fuel system, leading to fuel leaks and costly repairs.
