Have you ever noticed a plastic gas can that looks like it’s puffed up or collapsed inward? You’re not alone. Gasoline, while essential for many DIYers and tool users, can cause unexpected changes in the shape of its storage containers. Swollen or collapsed gas cans are more common than you might think, but what should you do when it happens? Let’s dive into why this occurs and the steps you should take to handle it safely.
Why Do Plastic Gas Cans Swell?
Plastic gas cans tend to swell when gasoline inside them releases vapor due to high temperatures. Gasoline is a volatile substance, meaning it evaporates quickly, especially in warm conditions. When this vapor has no way to escape because the gas can is sealed tightly, the pressure builds up, causing the walls of the container to bulge outward. This is a natural occurrence for gasoline stored in warm environments.1
It’s important to note that this happens because gasoline gives off substantial amounts of vapor even at room temperature, and when the temperature rises, the vapor expands, creating more pressure inside the can.
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Is It Normal for Gas Cans to Swell?
Swelling gas cans are generally nothing to worry about. Most plastic gas cans are designed to handle this kind of expansion without any issues. However, if you notice cracks forming in the plastic, it’s time to act. Cracks can lead to leaks, which are both dangerous and environmentally harmful. If your can develops cracks, you should safely empty the gas and recycle the damaged container.
If the swelling makes you uncomfortable, there are two easy solutions. First, you can release the pressure by simply unscrewing the cap for a few moments to allow the vapor to escape before sealing it again. Alternatively, consider upgrading to a heavy-duty metal gas can, which is more resistant to temperature-related expansion and collapse.
Why Do Gas Cans Collapse?
Just as gas cans swell in the heat, they can also collapse when the temperature drops. This happens when the vapor inside the can contracts in cooler conditions, causing a pressure drop. As the pressure decreases, the walls of the plastic gas can get pulled inward, making it appear partially collapsed.
The solution to this issue is simple: open the lid to allow some air into the can, and then place the can in a sunny spot for a few minutes. As the temperature inside the can rises, it should return to its original shape without any lasting damage.
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How to Prevent Swollen or Collapsed Gas Cans
Although swelling and collapsing gas cans are generally safe and normal, there are a few steps you can take to minimize these occurrences:
- Store in a Stable Temperature: Whenever possible, keep your gas cans in a place where the temperature remains consistent, such as a garage or shed. This will reduce the amount of vapor expansion and contraction.
- Use Venting Caps: Some gas cans come with venting caps or systems that allow vapor to escape automatically, preventing both swelling and collapsing.
- Switch to Metal Cans: If you’re looking for a more durable solution, heavy-duty metal gas cans don’t react as much to temperature changes and will maintain their shape better than plastic containers.
Conclusion
Swollen or collapsed gas cans may look alarming, but they’re usually just a result of temperature changes causing gasoline vapors to expand or contract. By understanding why this happens and knowing the steps to handle it, you can keep your gasoline stored safely and without worry. If your gas can show signs of cracking or excessive wear, it’s time to replace it—otherwise, a little swelling or collapsing is nothing to panic about.
h/t Family Handy Man.
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