What happens if you use the wrong fuel?

What to do if you accidentally put E85 gas in your car

If you accidentally use E85 gasoline in a non-flex-fuel vehicle, consider these steps to help minimize potential issues:

1. Don't panic: A one-time use of E85 typically won't cause permanent engine damage. According to the American Automobile Association (AAA), problems are more likely with repeated exposure than a single mistake.
2. Pay attention to how the car is running: Using E85 in a vehicle not designed for it may cause noticeable performance issues. Drivers may experience rough idling, hesitation or jerking during acceleration, reduced power, difficulty starting, or engine misfires. Your check engine light may also come on.
3. Dilute the fuel with regular gasoline: AAA explains that gradually lowering the ethanol concentration can help. If possible, periodically top off the tank with regular gasoline to dilute the E85 until you fully replace the fuel.
4. Refill with the correct fuels as soon as possible: Once the tank level drops, refill completely with the manufacturer-recommended gasoline. This will reduce ethanol content and restore normal operation.
5. Avoid repeating the mistake: AAA notes that flex-fuel vehicles are built with fuel system components designed to resist ethanol's corrosive effects, while standard vehicles may have rubber parts that can degrade over time with repeated exposure to fuels high in ethanol.

What happens if you use the wrong fuel: Gasoline vs. diesel

Drivers sometime mix up gasoline and diesel fuel. Using the wrong fuel can cause serious problems. What happens depends on which fuel ends up in the tank.

• Putting diesel in a gas car: Diesel fuel is thicker than gasoline. When it enters a gas-powered engine, it can clog fuel filters and injectors, preventing the engine from running properly. In some cases, the vehicle may stall or fail to start.
• Putting gas in a diesel vehicle: Gasoline is thinner and ignites more easily than diesel. In a diesel engine, this can lead to excessive heat and improper combustion, which may damage fuel injectors, pumps, and sensors. Repairs can be expensive, especially if the vehicle is driven.

What to do if you accidentally mix up gasoline and diesel fuel

According to AAA, using the wrong fuel can cause serious damage if the engine is started. Here's what you may consider doing once you identify the issue.

1. Don't start the engine: If you realize the mistake before starting the vehicle, leave the engine off. Starting the car can circulate the wrong fuel through the system and increase the risk of damage.
2. Drain the fuel system: AAA advises hiring professional help to drain the fuel tank and flush the system.
3. Don't drive the vehicle: If the wrong fuel has been added, driving even a short distance can increase the damage and lead to more costly repairs.
4. Contact roadside assistance or a mechanic: A tow to a repair shop is often the safest option. AAA notes that misfuelling repairs can be expensive, particularly when gasoline is put into a diesel engine.
5. Double check fuel labels in the future: Pay close attention to fuel pump labels and vehicle fuel requirements to avoid repeat mistakes.

Does car insurance cover gasoline removal?

Your auto insurance most likely won't cover the costs of removing and flushing the wrong fuel from your vehicle. But it's always a good idea to check with your insurer to find out for sure.

What if a gas station pumps the wrong gas into your car?

If a gas station employee puts the wrong fuel in your vehicle and it leads to damage, you may want to consult a legal professional. In some cases, you could be able to recover repair or towing costs if the station is found responsible for the mistake.