Gasoline spillage is a common occurrence that can lead to dangerous situations if not handled correctly. Many of us have found ourselves in scenarios where we’ve accidentally spilled gasoline on our clothes, car, or even inside our homes. But how long is spilled gas flammable? Can you safely remove it? In this article, we aim to answer these questions and provide instructions on how to properly manage a gasoline spill.

Understanding the Flammability of Spilled Gas

Gasoline is highly flammable, capable of catching fire from the slightest spark, making it crucial to clean up any gas spill as soon as possible.

The Quality of Gasoline

The gasoline we commonly use, such as car fuel, is not pure. It contains a high concentration of petrol carbon and other additives, which are combustible. Therefore, when gasoline is mixed with these, it becomes highly flammable, making any spill potentially hazardous.

The Surface Where Gasoline is Spilled

The surface on which gasoline is spilled plays a critical role in determining its flammability. On permeable surfaces, like fabric or concrete, gasoline can be absorbed and evaporate faster. However, these surfaces can still be flammable as gasoline soaked into them can react with a spark or heat.

Non-permeable surfaces like steel or glass cannot absorb gasoline, allowing it to linger and potentially catch fire. And finally, porous surfaces like wood can store gasoline within their internal pores, making them highly flammable.

Duration of Flammability of a Gasoline Spill

Gasoline remains a fire hazard as long as its odor can be detected in the air. Because it evaporates quickly, especially if spilled in the open air, it leaves an oily residue behind once dry. However, the fuel vapors are also flammable and can easily ignite due to the slightest spark. Thus, a gasoline spill is only considered safe when the odor evaporates and disappears completely.

In terms of safety, extreme caution is advised, especially if a gasoline spill occurs indoors. Gasoline vapors are heavier than air and can catch fire when they come into contact with any source of ignition, such as a pilot light, a pocket lighter, matches, and even running electrical equipment.

Evaporation Rate of Gasoline

Gasoline evaporates relatively quickly after being spilled. It takes around 1.5 hours for 90% of the deposited gasoline to evaporate from a surface like concrete. In general, about 4.5 to 5.3 percent of an initial sample is lost to evaporation during a two-hour test performed at around 70°F.

Gasoline vaporizes at 140 degrees Fahrenheit. If the temperature of the gasoline is raised, for instance to 200 degrees Fahrenheit, the gasoline will vaporize faster, resulting in quicker evaporation.

Best Ways to Clean Up a Gasoline Spill

Now that we’ve covered what not to do, let’s talk about the best ways to clean up a gasoline spill.

1. Use an Absorbent Material

Your first instinct might be to grab some paper towels, but you’ll need something much more absorbent for a gasoline spill. Cat litter, sand, or baking soda are all great options. These materials can soak up the spilled gasoline, making it easier to clean up. After the material has soaked up the gas, carefully remove it and place it in an old coffee can with a tight-fitting lid.

2. Dishwasher Detergent Solution

To remove any remaining stains, you can use a solution of dishwasher detergent and water. Apply this paste to the stain, let it sit for a few minutes, then rinse it away.

3. Trisodium Phosphate

If the detergent solution doesn’t work, you can try a stronger solution of trisodium phosphate (TSP). You’ll need to combine this with warm water and a lot of elbow grease. For really tough messes, consider renting a high-pressure water sprayer.


Is Gasoline Washed Away by Water?

You might assume that a good dousing of water would clean up a gasoline spill, but this isn’t the case. Water and gasoline don’t mix, so using water to clean up a spill only spreads the gasoline further, increasing the risk of fire and contamination.

Is It Permissible to Burn Gasoline?

While old gasoline will still burn, it won’t do so efficiently. But, most importantly, burning gasoline at home is extremely dangerous and should never be attempted. Gasoline fires are notoriously hard to extinguish and can quickly get out of control.

Is Gasoline Prone to Exploding in Hot Weather?

Gasoline stored in a sealed plastic container is generally safe unless it’s exposed to an external heat source, such as an open fire. However, in extremely hot weather, the pressure inside the container can increase, leading to potential risks. It’s always best to store gasoline in a cool, well-ventilated area away from any ignition sources.

How Quickly Must Gas Spilled in a Car Be Cleaned Up?

If you’ve spilled gasoline inside your car, it’s essential to clean it up as soon as possible. The gasoline can soak into the seats and carpets, creating a lasting odor and a potential fire risk.

Is Gasoline Flammable After It Has Dried?

When gasoline evaporates, it leaves behind a small amount of oily residue. While this residue may still smell like gasoline, it’s not typically flammable. Once the gasoline is gone, it can’t catch fire.

Is It Legal to Dump Used Gas on the Ground?

No, dumping gasoline on the ground is both illegal and extremely dangerous. The gasoline can seep into the soil, contaminating the groundwater and causing harm to humans, animals, and plants. Always dispose of used gasoline properly at a local hazardous waste facility.

Is Sand Capable of Absorbing Gasoline?

Yes, sand can absorb gasoline, making it a handy tool for cleaning up spills. Simply pour enough sand over the spill to completely cover it, then leave it overnight to absorb the gasoline. The next day, you can safely dispose of the gasoline-soaked sand.

Does Vinegar Degrade Gasoline?

Vinegar is a surprisingly effective tool for getting rid of gasoline stains and odors. If you’ve spilled gasoline on your clothing, try soaking the clothes in a mixture of vinegar and hot water for at least 30 minutes. The vinegar will help break down the gasoline without harming the fabric fibers.

Can You Use Baking Soda to Clean Up a Gasoline Spill?

Baking soda is a natural odor absorber and neutralizer, which makes it excellent for cleaning up gasoline spills. Simply mix enough baking soda with water to make a thick paste, then apply the paste to the spill. Once it’s dry, you can sweep it up and dispose of it.


In conclusion, dealing with gasoline spills can be dangerous and nerve-wracking, but with the right knowledge and tools, you can clean up spills effectively and safely. Remember, always treat gasoline with respect and caution to avoid any accidents.