How Do You Know If You Have Bad Gas in Your Vehicle?


Bad car gas is a term used to describe fuel that has gone bad. Various factors, including poor fuel storage, contamination, or the presence of water usually cause it. While bad car gas may not cause immediate damage to your vehicle, it can cause long-term engine problems and reduce your vehicle’s performance over time.

Signs of Bad Car Gas

Bad gas can cause misfires, hard starts, engine knocking, and other issues that can lead to costly repairs. Below, we discuss a few common warning signs of bad car gas and what you can do to prevent it from happening.

1. Unusual Engine Noises

One of the most common signs of bad car gas is strange engine noises such as knocking or pinging. This is usually caused by the fuel not burning completely, which can happen when the gasoline contains water or other impurities. If you hear unusual noises from your engine, it’s important to take your car to a mechanic to check it out.

2. Poor Acceleration

Another sign of bad gas is poor acceleration. If your car is struggling to speed up, it could be caused by contaminated or old gasoline. This can cause your engine to misfire or simply not respond when you press the accelerator. If you notice this happening, you should get your car checked out as soon as possible.

3. Rough Idle

Rough idle is another common sign of bad car gas. If the engine runs erratically, it could be caused by contaminated or bad gasoline. This can lead to increased emissions, poor fuel economy, and other issues. If you notice your car idling roughly, you should get it checked out by a mechanic right away.

4. Poor Fuel Economy

Poor fuel economy is another sign of bad car gas. If you notice your car getting fewer miles per gallon than usual, it could be caused by contaminated gasoline. It’s important to have your car checked out if you notice this issue, as it can further damage your engine.

How to Avoid Getting Bad Car Gas

Bad car gas can be frustrating, so it’s important to know how to avoid it. Here are some tips to help you stay away from bad car gas.

1. Look for Quality Stations

The quality of gasoline varies from station to station. Look for stations that carry well-known fuel brands, usually of higher quality. Additionally, try to find stations that have been in operation for a while and have a good reputation in the community.

2. Check the Pump

Before filling up your car, look at the pump for a few moments. If it appears old or poorly maintained, it might be best to look for another station. Additionally, check the nozzle and the hose for any signs of damage, as these can be indicators of poor-quality fuel.

3. Check for Contamination

If possible, ask to see the fuel before you buy it. This will allow you to check for any contaminants, such as water or debris. Additionally, inspect the fuel for any discolouration, as this could indicate poor quality.

4. Check for Octane Rating

The octane rating of gasoline is an indication of its quality. Look for higher octane ratings, as these will be less likely to cause engine damage. Additionally, check the labels on the pump to ensure that your fuel is the correct octane rating for your vehicle.

5. Report Bad Gas

If you think you have bought bad gas, it’s important to report it to the relevant authorities. This will help to ensure that other drivers are not affected by the same problem. Additionally, make sure to save any receipts, as this can be useful when making a complaint.


There are many factors to consider when it comes to car gas. However, the most important factor is the quality of the gas. Bad gas can damage your car and cause your performance problems. It is important to be aware of the signs of bad gas to avoid these problems.

Did you get contaminated fuel in your vehicle? We at Fuel Fixer can help you with that. Leave any bad gas issues you may have to us, the experts. Get in touch with us to learn more about what we can do for you.

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