Updated at: 12-08-2022 - By: Lucas

Many flammable liquids can be purchased, including gasoline. There is a guide here that will help you identify gasoline by color and scent if you’re curious about what color it comes in or have kept it for your car or lawnmower and have since forgotten which container it was in.

Gasoline is clear or yellow when it is unrefined. The color of commercial gasoline is either pale yellow or blue for safety reasons.

How To Recognize Gasoline

Colour Of Petrol-2

One of the most common misconceptions about gasoline is that it is something that can only be found in gas stations. It enters the gas tank via the hose from the gas station terminal.

Even if you look inside a red canister, the color will be distorted due to the canister’s red tint. However, you can check the color of your car’s gas through the fuel filter in an ingenious way.

A clear gasoline filter can be used to check the quality of the filter and the color of the fuel in some automobiles. Look at the filter contents if it’s empty, then put the engine in park gear for a few seconds and you’ll see the gasoline running through.

Gasoline Color And Octane Grade

The octane rating and the color of the gasoline are said to be linked by many, and there are three basic types:

  • Regular 87 octane gasoline has a blue or green tint.
  • Midgrade/Plus 89-90 octane gasoline has a yellow tint.
  • Premium 91-94 octane gasoline has a pink tint. 

I can’t verify this information on every gas pump in the country, but I can tell you that it’s not the norm.

The only fuel color restriction in the United States pertains to tax-exempt fuel used for heating, cooking, and off-road use in general. A police officer can clearly see if you’re using red fuel, which is against the law, thanks to the filter’s transparency.

It’s pointless to paint different octane ratings a different color because you’re not allowed to notice the color of fuel. It’s possible that the color matching was caused by the gas station nozzles’ colors, rather than by the color of the fuel.

You can see ChrisFix on YouTube experimenting with various sorts of fuel, from standard to super. All four vials have a yellow-hued yellow liquid in them, despite the somewhat purple table they’re on.

How To Recognize Gasoline By Smell

Colour Of Petrol

To begin, inhaling gasoline is extremely risky. When inhaled, gasoline vapours are exceedingly hazardous to the human body, causing headaches and lightheadedness when inhaled deeply.

Benzene is responsible for the distinctive odor of gasoline. The stench you picked up when filling up at the gas station is enough to tell you where the trouble is. Unlike pure alcohol, it has an annoying, noxious fragrance that makes it difficult to breathe.

When you remove the cap of a canister, the fragrance tells you that it contains gasoline instead of the color of the liquid. The scent of gasoline can be useful if your engine oil is combining with gasoline.

How To Recognize Bad Gasoline

Incredibly, the shelf life of gasoline is only up to six months. It is possible to extend the life of a fuel by using different stabilizers, but if the gasoline has gone bad, it should never be used again.

The oxidation and evaporation of gasoline cause it to degrade over time. However, you’ll notice that the gas smell is considerably less noticeable, and you can even breathe normally around it!

Gasoline’s hue will likewise shift as a result of these modifications. There will be an increase in darkness as the degradation of the original clear color with a subtle yellow hue proceeds. The container will turn a dark reddish hue as sediment accumulates at the bottom.

A recycling facility is the best place to dispose of stale gas. It’s not suitable for internal combustion because it has lost most of its energy, and it can contaminate the fuel tank, the fuel line, the injectors, and other parts.


What fuel is blue in color?

The characteristic blue or green color of diesel distinguishes it from other types of fuel. It’s also thicker and has a lesser fragrance than regular gasoline.

Is gasoline dyed?

Gasoline can either be colored or completely clear, depending on the refining process. However, it is predominantly yellow in color and does not need to be dyed any more. Other than painting off-road fuel red to make it stand out, the United States has no restrictions governing the dying of petrol.

What is red gasoline?

Regular fuel is dyed red to indicate that it is not intended for use in motor vehicles; however, red diesel is the more usual choice. Cargo fuel is taxed to help maintain highways and the environment, yet the same fuel can power farming equipment and be used to cook or heat.

In order to discourage individuals from driving on red gasoline, US regulations segregate the two types based on price as well as color.

What fuel is green in color?

Diesel’s color can range from green to blue, depending on the batch. Although biodiesel claims to be green because it’s derived from renewable sources, it doesn’t necessarily have a green tint because refined diesel can also have a green tinge.

Gas stations are happy to fill up your empty jerry cans. As long as the canister is suitable for the job, you can fill it up with any type of fuel you like.

Does fuel expire?

Even in a sealed canister, fuel has a short lifespan and can become unusable in a matter of months. A fuel stabilizer can extend the lifespan to 24 months.

Can gas cans explode in the sun?

Gas will not explode because it is designed to hold gasoline and endure heat accumulation, making it safe in the sun.

Can you mix old gas with new gas?

You can’t use new gasoline if the old one isn’t safe to use. Although gasoline that has been sitting on your shelf for a few months may no longer be used, you can restore its quality and use it in your car again by combining it with new gasoline, especially high octane.

Can you pour gasoline down the drain?

Gasoline, or any other harmful chemical, should never be flushed down the toilet. It’s not just a health hazard, but it’s also against the law.

How do I get rid of bad gas in my car?

When it comes to removing gas from a vehicle, it’s simple as long as you have the correct equipment. Manual fuel pumps can be purchased at any hardware store and used to suck fuel out of the tank for disposal.


Having learned that gasoline is intended to be clear and yellow, you’ll be able to tell when it’s gone bad and how to fix it. If you’re refueling your car with old, degraded gasoline, you run the risk of a variety of system malfunctions inside the vehicle.