7 Worst Things To Put In A Gas Tank (Don’t Try This!)

Your gas tank is essential. It would be for the best if you did not put anything in here other than gasoline. But what would happen if something other than gasoline was poured into a gas tank? 

Well, it can do damage to the vehicle. Many things can ruin an engine. If you put these things inside the gas tank, then some can ruin the vehicle’s engine. 

Some will also make the engine burn, and some can also stop the flow of the fuel. The result will be a disruption to the engine. Some people intended to ruin a vehicle’s engine but if you do not want your engine to get damaged, never put these things inside your gas tank. 

The only thing that should be going inside your gas tank is the gasoline. Other than that, it will already cause damage to your vehicle. 

We will list down 7 of the worst things that anyone can put in a gas tank. Let us get started.

Worst Things To Put In A Gas Tank

What’s The Worst Thing To Put In Someone’s Gas Tank?

There are a lot of things that can be harmful to a gas tank. Here are some of them. 


If the chemical composition is mixed with the gasoline inside the gas tank, it will create a mess of corrosive sludge. This can then clog up the engine of the car. Coke is proven to do damage to your car’s engine. 

If you want your car’s engine to be ruined, then putting coke inside your gas tank will do the job but if you do not want your car’s engine to get ruined, never put coke inside your gas tank. The amount of the coke you put in will determine the extent of the damage it has caused. 

If you put coca-cola in a gas tank, it can ruin your engine fast. You can detect that something is wrong with the fumes from your car. You will notice an emission of fumes from your car.



If you put a lot of salt in the gas tank, it will also cause corrosion at the bottom of the gas tank. If the salt is mixed with the gasoline, the salt crystals will be slipping into the fuel pump. If this happens, it will obstruct the filter. 

As a result, the engine might not be able to run anymore. The vehicle can also overheat. Salt might not damage a vehicle so bad as bleach, but it can cause corrosion.



If you put sugar in gas tanks, it will turn the fuel into surgery petroleum. The sugar does not melt in the gasoline. With this, the sugar will clog up the fuel filter. 

If the sugar will enter and pass through the fuel tank, the sugar will go at the bottom of the gas tank, and this will screw up the car engine and the gas tank. This can also be very effective if you want to damage a car’s engine. This is not limited to just sugar, though. 

Any liquid that contains sugar can cause damage to the vehicle’s engine. Things like honey syrup and many other things made with a lot of sugar can do the same thing. 

To fix this, you will have to clean the filter, fuel pipe, and other engine parts of your system. This will be necessary to remove any traces of sugar in the system.



If you put water in a gas tank, it will ruin the car’s engine. When you are driving with water in your gas tank, it can be hazardous. Water in the gas tank will not allow a car to run fast. 

The water can also separate the fuel from the engine mount. If you are unaware of this and driving on the road, it can be hazardous because you can lose control of the car. 

Your car might run smoothly at first, but then you can lose control over it after some time. This can be dangerous because you can be in a car accident. So always check for any unusual going on in your car.


Hydrogen Peroxide

Hydrogen peroxide and gas are not a good combination. If you mix gas and hydrogen peroxide, the bur rate will increase, and it will put your car and your car’s engine to a high temperature. 

Hydrogen peroxide can boost your car’s power and increase its speed. However, it must not be mixed with gas. As mentioned, the engine can get hot, and it can burn and can destroy the engine.

Hydrogen Peroxide


It is very dangerous to drive a car with bleach on the gas tank. If the bleach stays in the gas tank for a long time, it can create corrosion and rust to the car’s engine and its mechanical parts. Some people who want to destroy a car’s engine use bleach to do the job for them. 

It is very effective in damaging a car’s engine. Water can damage a car’s engine, and bleach is made out of ninety percent water. The effect is almost the same. 

It is essential to avoid putting bleach in your gas tank. The car will run at first, but if the car will detect no hint of fuel anymore and start to consume the bleach, the vehicle will not run anymore. Your car’s engine will be severely damaged, and it might also cause you a lot of money to get it repaired and fixed.



The damage can be determined by the amount of urine you will put in the gas tank. If there is only a tiny amount of urine, then it might not likely do some damage. However, if there are many urines inserted in a gas tank, it can do damage already. 

A lot of urine is bad for the gas tanks. The effect might not be instant, but it will slowly damage your car’s engine.  

If this happens, then you’ll have to clean your gas tank’s filter and fuel pipe. The worst thing is that you have to consult a mechanic.



In summary, a gas tank is essential. The gas tank must be filled only with gasoline and nothing else. 

If the gas tank is filled with other things aside from gasoline, it can cause damage to the car and the car’s engine.



Image credits – Canva

Share on:

My name is Hank, and I've been in the automotive industry for 27 years. I've been working in my own auto repair shop for the last 13 years, and now I want to help you here, on my blog. Let me know if you have any questions. Read more