What Color Should Gasoline Be?

Gasoline that’s good to go should have a slight yellowish hue. Depending on the light, it might look more green or even a bit orange. But if it’s showing any other shades—like tan or red—something’s not right.

Fresh gas is usually clear or just a touch yellow. If it’s any color other than that, especially red or brown, it’s likely not gasoline. Let’s clear up some myths around this topic.

Myths About Gasoline Color

There’s a lot of confusion about gasoline colors, especially with all the different labels at the pump. In the U.S., regular fuel is usually 87 octane, with premium going up to 94 octane. The colors on the labels vary, but the fuel itself? Always that classic amber tint.

Old gas can turn brown if it’s been sitting too long, but that’s the only color change to expect.

Gasoline Color Regulations

There aren’t strict rules about gasoline color, but it should always have that yellow-green vibe straight from the refinery. In the U.S., the big deal is around red dye, which indicates off-road fuel. In Canada, off-road fuels can even be violet.

Why Is My Gasoline Red?

If gas looks red in a jerry can, it could just be the light playing tricks. But if it’s genuinely red, it’s likely illegal for road use. That red dye is usually for diesel, marking it for off-road use only. Using it in a car can lead to hefty fines for tax evasion.

How to Check Gasoline Color

Most folks don’t even think about it when filling up. Just pop the nozzle in and let it flow. But if curiosity strikes, old fuel filters can be clear, letting a peek at that yellow tint. Or, if there’s a two-stroke engine around—like a weed whacker—pouring gas in gives a good view of the color.

Identifying Gasoline

At a gas station, just read the pump labels. If using a jerry can, the smell can help differentiate gasoline from diesel. But if there’s any doubt, it’s best to avoid mixing them up—putting diesel in a gas engine can lead to serious issues.

Old fuel? Dispose of it properly at a recycling yard. Pouring it out on the ground or down a drain is a no-go and can lead to fines.

Is Old Gas Bad?

Old gas can turn reddish-brown and might have sediment at the bottom of the can. It can last three to six months before it starts to break down, but if a car sits for years, that fuel could cause problems. Old gas loses its combustibility, leading to engine clogs and misfires.

If a car hasn’t been used for a few months, it’s usually fine. But for a long-dormant vehicle, it’s smart to flush out the old fuel and replace it with fresh stuff.

Is Premium Gas a Different Color?

Nope, premium gas is the same yellow-green as regular fuel. If the owner’s manual recommends it, then it’s a must. Premium can save money in the long run, plus it often has additives that help keep engines clean.

Trying premium every now and then can be beneficial. If it makes a difference, great! If not, no biggie.

How to Fill Up

Filling up is straightforward. Choose the grade, pop the nozzle in, and let it do its thing. No need to stress about the color of the gas. If there’s a suspicion about red fuel, steer clear and report it if necessary.