Hydrogen Peroxide In A Gas Tank: What REALLY Happens?!

Many people are asking what really happens if hydrogen peroxide is to be put in a gas tank. So now, we will talk about that, and we will provide you with the answers you need.

So what really happens if hydrogen peroxide is to be put in a gas tank? There is a huge possibility of your car not starting. The worst that can happen is that your car ignites and explodes.

People are curious, and people would always want to know the result if you put hydrogen peroxide in your gas tank. Some people already know the results, and they use them for personal reasons. Some people believe hydrogen peroxide could cause your vehicle to run fast, but some people believe that putting hydrogen peroxide in a gas tank can ruin the vehicle.

So if you are not sure what the effect of hydrogen peroxide is, then that is okay. What is not okay is putting hydrogen peroxide in your gas tank without really knowing the result it can give you. 

So today, your worries are over. We will be talking about the effects of putting hydrogen peroxide in your gas tank. Let us get started.

Hydrogen Peroxide In A Gas Tank

What Happens If You Put Hydrogen Peroxide In A Gas Tank?

Hydrogen peroxide is believed by some people that could increase the speed of a car. However, many people countered this statement because if you put hydrogen peroxide, it is believed that it does nothing well and can even ruin the vehicle’s engine. So now, let us talk about the short-term effects and long-term effects of putting hydrogen peroxide in a gas tank.

Short Term Effects

We have to make this clear. If you put regular hydrogen peroxide in the gas tank, the engine will not start. The effect will depend on the kind of concentration the hydrogen peroxide has. 

If you put a concentrated hydrogen peroxide, the hydrogen peroxide will settle in the bottom because it is polar. It is also non-soluble in non-polar chemicals, just like petrol. So what happens now is that it will release a lot of oxygen. 

When that happens, your car will not start at all. So if you put concentrated hydrogen peroxide in your gas tank, your car will not be able to start at all. You must already have your car fixed not to spend so much more money if you wait for the long-term effects.

Long Term Effects

When talking about the long-term effects. If you put hydrogen peroxide in your gas tank, there will be a significant chance of spark, and it can also ignite and explode. The long-term effect is more dangerous. 

So for your safety, never put hydrogen peroxide in your gas tank. The effects can also be more corrosion because hydrogen peroxide also has water. 

One thing we know about water is that it is corrosive. It can cause rusting on vehicle parts and components.

Can You Pour Hydrogen Peroxide Into Your Gas Tank?

Yes, you can, but you should not. If hydrogen peroxide is mixed with gas, it can increase the burn rate, and it will then put the engine at a high temperature. If that happens, then your vehicle will get burned up, and it will then destroy your engine.

Does Hydrogen Peroxide Ruin A Car Engine?

This will depend on the level of concentration of the hydrogen peroxide that you will put inside the gas tank. If you get those hydrogen peroxides in the drug store, that is just about three percent. The others will also vary, so the level of concentration will tell the result. 

If you use hydrogen peroxide in the drug store, nothing will happen. But if you use more liquid, then it will get sucked up by the fuel injectors, which will prevent your engine from running. So if you have pure hydrogen peroxide, it can probably cause an explosion. 

What matters most is the amount of concentration of hydrogen peroxide. The result will be based on there. 

So depending on the level of concentration of the hydrogen peroxide, it can cause just mild effects. It can just damage the fuel system. The severe one can be an explosion.

How Long Does It Take For Hydrogen Peroxide To Destroy An Engine?

It depends on what you did after putting in the hydrogen peroxide. The amount of hydrogen peroxide can also determine how fast or how slow the result can occur. If you have put just a tiny amount and then you immediately took your car to a mechanic to fix it, or you did the fixing yourself, then the result will be slower and mild too. 

But if you have poured a lot of hydrogen peroxide and you had run your engine the moment you knew, then the result can be severe, and the result can be faster too. Your engine might be destroyed much faster than you thought.

hydrogen peroxide in gas tank

Can Hydrogen Peroxide Be Detected In A Gas Tank?

Well, yes. Hydrogen peroxide can be detected. This will vary. If you do not check your gas tank properly, you might not notice that your gas tank has hydrogen peroxide. 

The amount can also help you. If the gas tank is filled with hydrogen peroxide, then you will readily detect that. But if you will look closely, then you might be able to detect the hydrogen peroxide in your gas tank.

What To Do If You Think You Have Hydrogen Peroxide In Your Gas Tank?

The first thing you should do is not to start your vehicle. If you suspect that your gas tanks have hydrogen peroxide, you must stop driving your car immediately. If you have not yet started the car, do not do so. 

Starting your car and running your car can cause the inside of your gas tank to be absorbed and used by the vehicle. It will then cause a lot of damages if your car is running. So do not start or drive the car and immediately call a mechanic.


In summary, hydrogen peroxide is believed to make a car run fast. But most people believed it otherwise. Hydrogen peroxide can destroy your car and its engine. 

Depending on the level of concentration the hydrogen peroxide has, it can damage your vehicle from mild to severe. The severity will be an explosion.



Image credits – Canva

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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