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Avoid Disaster: Never Put These in Your Gas Tank

Worst Things To Put In A Gas Tank

For those curious kids or anyone considering the use of cleaning products in a car’s gas tank, it’s crucial to understand that anything other than fuel can cause damage to the car’s engine. Some certain substances can inflict severe damage in a shorter space of time. Here’s a distilled list of the eight worst things to put in a car gas tank: sugar, water, bleach, hydrogen peroxide, salt, antifreeze, brake fluid, and the wrong type of fuel. Each of these can severely compromise the integrity of your engine, leading to costly repairs or even complete failure. The takeaway? Keep your gas tank pure and your curiosity in check.


Putting water in a gas tank can lead to numerous problems and potentially ruin a car’s engine. If water infiltrates your fuel tank, you might notice your car is not accelerating as quickly or as smoothly as it should, creating a hazardous situation, especially if you lose acceleration on a fast-moving road. This seemingly harmless act is dangerous, as you could be driving unaware of the imminent failure it can cause. Water can separate the engine from the engine mount, leading to an accident, or enter the cylinders, causing the engine to seize. Even a small amount of water can damage your vehicle. The main sign that water has been introduced is a notable decrease in performance; your car will not accelerate easily and will be slower than usual.


Bleach, a common agent for cleaning around the home, becomes a perilous substance when introduced into a car’s gas tank. Despite its household utility, its adverse effects on a fuel tank are profound. As a powerful chemical, bleach can corrode both rubber and metal components within a car engine, compromising the integrity of vital parts. Its high water content exacerbates issues similar to those caused by water, affecting the fuel’s ability to run the engine efficiently. This can lead to the engine losing power, failing to operate quickly or smoothly, and, over time, may severely damage the vehicle’s engine. The corrosion inflicted necessitates expensive repairs or, if left undetected, could escalate to the point where one must pay for expensive parts replacements.

Hydrogen Peroxide

Hydrogen peroxide, a chemical typically hailed for its antiseptic properties, becomes a hazard when combined with the fuel in a car’s gas tank. Its introduction creates a mixture that can misleadingly look like nitrous oxide, potentially increasing the burn rate within the engine. This can cause the engine to become too hot, leading to damage to internal components. While it might momentarily make the car run faster, akin to a nitrous oxide system, the short term gains are overshadowed by the risk of causing the engine to overheat and be destroyed. Despite any temptation to boost speed and power, it’s strongly advised against, as the benefits do not outweigh the significant risks involved.


Soda, particularly Coke, can be lethal to a car’s engine. The sugar and other ingredients in Coca Cola and similar beverages are highly damaging when introduced into the fuel system. These components can form a sludge-like mixture in the gas tank, potentially clogging the fuel filter as the fizzy drink circulates through the engine. This can significantly impact the car’s performance, with exhaust fumes appearing less than normal—a clear indicator of soda mixing with the gas. Even a small amount may not cause noticeable problems initially, especially if the tank is full. However, an increase in the amount of Coke escalates the potential damage. If a fizzy drink has compromised your vehicle, a visit to a mechanic to check the extent of the damage, flush the intakes, and replace any parts beyond repair becomes essential.

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While other fluids may cause issues when poured into a car’s gas tank, sugar presents a unique dilemma. Contrary to immediate assumptions, sugar doesn’t cause immediate damage; it simply sinks to the bottom of the tank, much like sand, without dissolving or mixing with the fuel. However, the problems it introduces are long term. Over time, sugar can clog the fuel filters, leading to a clogged system that stops fuel from moving freely to the engine, resulting in misfires and poor acceleration. Contrary to the myth that sugar granules will destroy an engine outright, they do cause serious issues with performance. To remove sugar from your car’s system, it needs to be professionally cleaned by a mechanic who can clean the pipes, intakes, and filters of any built-up sugar sediment.

Regular Antifreeze

Antifreeze may sound like it’s meant to keep your engine cool, but never should it find its way into your car’s gas tank. Regular antifreeze is designed for the radiator and is the correct place to prevent avoidable damage. When poured into a gas tank, it can circulate with the fuel and cause various problems for the engine, leading your vehicle to splutter upon start and idle poorly. If you continue to drive under these conditions, seeking a professional to drain the fuel tank becomes imperative. Note that specific gas-line antifreeze exists to avoid liquid freezing inside the tank, but regular antifreeze must only be poured into the car radiator and nowhere else.


While not the first choice for a criminal looking to destroy an engine, salt can cause significant damage to a car. Unlike sugar, when salt is poured into a vehicle’s gas tank, it settles at the bottom and can lead to built-up corrosion. The small grains of salt can accumulate inside the fuel pump and filter, eventually becoming blocked. This impediment restricts fuel from moving properly from the tank to aid engine combustion, leading to misfires, poor performance, and the inability to start. A clogged filter might also result in overheating, and if the temperature rises too much, a complete engine meltdown could occur.

Brake Fluid

A common theme across harmful substances for your gas tank is that any fluid other than gas poses a risk. Accidentally introducing brake fluid into your fuel tank can lead to a strong chemical smell while driving, indicative of its potent nature. Being silicon-based, brake fluid can degrade oxygen sensors and damage rubber parts within the engine. A small amount may dilute in a tank full of fuel with minimal adverse effects, but if there’s not much fuel and a large amount of brake fluid is added, you’ll likely encounter problems. Attempting to run your car on brake fluid alone can cause the engine to misfire, have difficulty starting, and ultimately, break completely. If you suspect your tank is full of brake fluid, it’s critical to have a mechanic immediately drain it.


The Wrong Fuel

Putting the wrong fuel in your car’s tank is a surefire way to destroy the engine. Whether it’s diesel in a regular gas-run car or vice versa, the moment you start the engine after filling up with the wrong fuel, it begins to circulate and cause problems immediately, leading to expensive damage. The danger of driving your car with the wrong fuel extends beyond just the engine, affecting the entire fuel system, including the pump, filter, and pipes. If you realize you’ve put the wrong fuel in, it’s crucial not to start the engine. Instead, push your car to a safe spot at the gas station and call for professional help. Roadside assistance or a car recovery service will need to drain your fuel tank and remove any contamination. Should you accidentally start your car with the wrong fuel in the tank, after it’s been drained, a professional mechanic will need to check all engine components for damage.

How To Destroy An Engine With Bleach?

Putting bleach in a gas tank to ruin an engine involves mixing several gallons of bleach with the fuel, a recipe for disaster. This act, arguably suicidal for the car, can destroy it for some weird reasons. Initially, the vehicle might run, but it will halt altogether once there’s no trace of fuel left in the tank. Leaving bleach too long inside the fuel system will corrode and cause rust to engine components due to chlorine, a highly corrosive oxidizer. This method is a surefire way to significantly damage a car’s engine.

How To Destroy A Car Engine Undetected? – Pour water

Pouring water into a gas tank might seem confusing to some, as water is a seemingly normal substance. However, it can disable a tank and end up damaging the engine significantly. This serves as a cue that anything not fuel is harmful to an engine. You might be surprised to learn that even substances like bleach, which contain more than 90% water, are detrimental to an engine. Mixing water with fuel creates an effect akin to corroding and rusting, potentially leaving a driver unaware while driving. The car might initially run like a wild horse but eventually, water can detach the engine from the engine mount, leading to catastrophic failure.

What To Put in Gas Tank To Ruin Engine?

For those inclined to experiment or play a prank driven by hate, it’s critical to understand the gravity of putting foreign substances in a gas tank to ruin an engine. We strongly advise against such actions. However, becoming familiar with engine-wrecking ingredients and their effects is essential for awareness and prevention. Introducing harmful substances into the fuel system can lead to irreversible damage, endangering vehicle functionality and safety. It’s important to prioritize responsible behavior and vehicle care over mischievous intents that could lead to costly repairs or dangerous outcomes.

What To Put In Gas Tank To Ruin Engine?

Have you ever wondered what’s the worst thing to put in a gas tank to damage or stall an engine? For the car geek intrigued by weird questions, the answer involves a variety of ingredients that can do just that. Some substances merely stall the engine, while others can damage or corrode its components, effectively leading to the ruin of your car engine. Introducing harmful materials into the fuel system is a surefire way to compromise vehicle performance and potentially incur significant repair costs.

The Sweet Little Sins!

The allure of mischievous acts like introducing sugar or other sweet, sticky liquids into a gas tank might seem like a harmless urban legend, but these substances can indeed clog the fuel filter. Honey, molasses, waffle syrup, and pancake syrup are not dissolved by gasoline, leading them to sift through the fuel line and settle at the bottom of the tank. While these ingredients might not cause major damage immediately, they can stop your engine cold. Remedying this requires more than just a simple clean; it often necessitates a change of the fuel pipe and gas tank to remove all traces from the system.


Can Someone Put Something In Your Gas Tank?

Cars are not immune to vandalism, and while some criminals may opt for slashing tires or smashing windshields, others choose more subtle and creative methods to destroy a car. Pouring a substance into the fuel of a vehicle’s gas tank is one such method. Tampering with a person’s car can stem from an act of revenge or be a random crime. Regardless of the motive, purposefully damaging someone’s property constitutes a criminal offense and can lead to criminal damage, fine, or jail time. If you’re contemplating putting something into someone else’s gas tank, it’s wise to reconsider. Such actions not only ruin the engine but can also land you in trouble. However, for those with a curious mind interested in knowing what substances can’t be put in a car gas tank, it’s a cautionary tale to heed.

Can You Tell If Someone Has Put Something In Your Gas Tank?

Yes, it’s possible to tell if someone has put something in your gas tank, even if there aren’t always visible signs of tampering with the vehicle’s gas cap. Despite locking mechanisms, caps can be broken into, and substances introduced without your realizeation. Drivers can identify issues when their vehicle starts exhibiting varying symptoms. Common signs include rough idling, slow acceleration, rough acceleration, white steam from the exhaust, and the check engine light on. Additionally, rust and corrosion inside the tank or engine, failed ignition, a clogged fuel filter, or difficulty starting the car are indicators that something is contaminating your fuel tank. If you’re noticing any of these problems, it’s crucial to investigate further.


Overfilling the gas tank of vehicles can damage the system and its components. The typical gas tank operates on a closed circuit system, designed to incinerate the fumes of the gasoline. Whether done intentionally or by accident, overburdening this system can lead to a clog or damage, impacting the vehicle’s performance and safety.

Low oil, faulty spark plugs, carbon buildup, worn engine parts, mechanical issues, lack of maintenance, and lack of coolant are among the most common causes of an engine seizing or locking up. Addressing these issues promptly can prevent your engine from seizing up.

Common places where your fuel system will get clogged include the Fuel Filter, where sediment from the gas in your tank accumulates. Fuel Injectors can get blocked by carbon buildup. Fuel Lines, especially in older vehicles, can also become clogged. Lastly, the Fuel Pump itself can be a point of blockage.

If milk is the only substance introduced into a gas tank, the situation may not be as dire as expected. Should the vehicle fail to start, the remedy involves simply draining the fuel tank and refilling it with fresh gas. This scenario, while inconvenient, does not constitute a major issue on its own.

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