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The Curious Case of Bleach in Gas Tank!

People are curious by nature. We all have one or two wises to do something stupid only to see the after effects. What could auto enthusiasts have wished about? Well, they may want to know what happens when pushing the start button in a running car or how the car reacts when there is bleach in gas tank. People don’t do these experiments because of safety cautions. But, hey, we’re here to explain to you what happens to a vehicle after adding bleach to gas tank.

What Happens If You Put Bleach in Gas Tank?

Whether you put bleach in gas tank for ‘experimenting’ or someone else does that out of evil intention, knowing what could happen will help you to handle the situation without any problem.

adding bleach to gas tank
The car will run for a while even with bleach in the tank.

How the Car Reacts

Putting bleach with a small amount of motor oil will cause little visual changes. The car will run (surprisingly) for a while and then it will come to a stop with the liquid mix jetting out of the fuel injectors and other components of the fuel system. How long the car lasts will depend on how much fuel is there in the tank.

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What will be the Internal Reaction?

Bleach is mostly water but it also has a small amount of chlorine, which makes it caustic and corrosive. When coming in contact with the fuel, the chlorine will pre-burn into the fuel before it gets to the engine.

If you drive the car for a short period with bleach in gas tank, it will not cause much destruction. You should still flush out the fuel and fill the tank with fresh, clean gas because the corrosive bleach can eat up certain metal and rubber components if left there for a long time. Also, it can leave harmful sludge inside the valves and combustion chamber. In that case, using an alcohol-based fuel addition is the best solution because it can suck up the beach residue.

On the other hand, driving with bleach in gas tank will bring disastrous effects. The longer it stays inside the engine components and fuel system, the more time it gets to erode the rubber and metal parts. The caustic effect of bleach on these components is grave and unbelievably faster than normal corrosion. The fuel lines, tank, pump injectors – everything will be affected. The damage can even reach the cylinder head and intake manifold.

how much bleach does it take to ruin a car
Too much bleach can ruin the car outright.

How Much Bleach Does It Take to Ruin a Car?

If you are searching for ways to know how to destroy an engine with bleach, apply these two ways. Pour a moderate amount and drive the car for a long time (or as long as it keeps running). Or, pour a whole container with a little amount of fuel. That much of bleach is likely to take 5 to 10 minutes to destroy a car. In a way, the effects bleach will cause are almost similar to pouring the same amount of water into the tank (except for the corrosive part). However, if you want to stop the engine completely, you have to put a lot of bleach in gas tank.

Check out the video below to see more details:

Now we all know what happens if we put bleach in the gas tank and how terrible it is. If you have any question about this topic, feel free to leave us a comment below.
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3 Comments
  1. Name says

    Seems childish.

  2. Daniel says

    Well someone dump 2 gallons of beach and we didn’t now it and vehicle does not run no start and now we have to pay a lot to get it back meaning brand new fuel rails fuel pump and now a whole new engine because we didn’t now we were running bleach for a month so the person broke the locking gas cap and again we don’t drive the vehicle often gas prices are to high to be putting so much so new whole engine

  3. Angela says

    Hi I was wondering if there is a way to be able to tell that there is bleach in your tank. Would you be able to smell it or maybe some smoke might come out or stick a hose in to the tank and you might be able to see something.

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