Why You Shouldn't Over Fill Your Gas Tank

Over Fill Gas Tank

Follow the automatic pump shutoff, and you'll not only save money but also play your part in reducing air and water pollution
When it comes to refueling your car, convenience often takes center stage. Nobody enjoys the hassle of waiting in line at a gas station or taking a detour just to find a place to fill up. In an attempt to make the most of a tank of gas, you may be tempted to top it off after the pump has automatically stopped. However, experts from Consumer Reports and the American Automobile Association (AAA) have a word of caution: topping off your gas tank may not be the best idea. Let's delve into the reasons behind this advice.

The Dangers of Over Filling a Gas Tank

It May Damage Your Car
John Ibbotson, Consumer Reports' chief mechanic, emphasizes that there's more to your car's fuel tank than meets the eye. Fuel systems have evolved significantly to comply with stricter emission regulations. Specifically, Ibbotson points to the onboard refueling vapor recovery (ORVR) system, which plays a critical role in reducing emissions and conserving fuel.

ORVR systems, equipped with charcoal-lined canisters, capture fuel vapor during refueling and absorb it through activated carbon. This process helps cut hydrocarbon emissions by about 95% and utilizes the captured fumes as usable fuel. Although ORVR systems have been around since the 1970s, the Environmental Protection Agency (EPA) made them mandatory in nearly all newly manufactured vehicles between 1998 and 2006.

If you ignore the automatic shutoff at the gas pump and continue to top off your tank, the excess fuel can saturate the charcoal canister. This can trigger your car's "check engine" light and potentially lead to costly repairs, according to Ibbotson. Overlooking this avoidable issue could result in hundreds of dollars in expenses. Moreover, when the ORVR system is flooded with fuel, your car may emit more hazardous fumes than usual, adversely affecting your gas mileage, as highlighted by AAA.

You May Loose Money
Gas stations are required to have vapor recovery systems in place to prevent air pollution and fuel spillage. These systems are designed to shut off the pump when your tank is full. However, if you choose to top off your tank, the excess fuel is drawn back into the pump, essentially causing you to pay for gas you can't use. This means you're not only wasting money but also contributing to the potential environmental issues mentioned earlier.

It Can Harm The Environment
Attempting to top off your tank can result in spilling flammable liquid on the ground. This spillage has the potential to contaminate groundwater, surface water, soil, and the air when the spilled fuel evaporates. This damage to the environment can have far-reaching consequences, affecting both local ecosystems and the wider environment.

In conclusion, while topping off your gas tank may seem like a small, harmless habit, it can have significant consequences for your vehicle, wallet, and the environment. To avoid damaging your car's emissions control system, wasting money on unusable fuel, and contributing to environmental pollution, it's best to refrain from topping off your gas tank. Instead, follow the automatic pump shutoff, and you'll not only save money but also play your part in reducing air and water pollution.


FAQs About Over Filling Gas Tank

Is it okay to round up to the nearest dollar when filling up my tank?
It's generally okay to round up to the nearest dollar when filling up your tank. Just be cautious not to overfill it, as this can lead to the issues mentioned in the article.
Can topping off my gas tank really damage my car?
Yes, topping off your gas tank can potentially damage your car's emissions control system, leading to costly repairs.
Are there any benefits to topping off my gas tank?
Topping off your gas tank may provide a small amount of extra mileage, but the potential drawbacks, including damage to your car and environmental harm, outweigh any benefits.
How can I prevent overfilling my gas tank?
To prevent overfilling, simply rely on the automatic pump shutoff feature. It's designed to stop when your tank is full.
What should I do if I accidentally overfill my gas tank?
If you accidentally overfill your gas tank, try to absorb the excess fuel with a cloth or paper towel. Be sure to dispose of it properly, as spilled gasoline is flammable and harmful to the environment.

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