Why Does My Car Smell Like Gas?

Automotive Advice

Last Updated

If a car has an issue with its fuel system, it can result in a number of problems that leave the car smelling like gas.

This can be worrisome and confusing as a car owner; you may want to know why your car is smelling like gas and whether it poses any danger to you and other drivers on the road.

So, why does your car smell like gas?

Your car may smell like gas due to a fuel leak, the fuel not being fully burnt in the engine, or problems with the catalytic converter or evaporative emissions control system.

We are going to discuss some of the top reasons that your car might smell like gas, what you should do if you find out that your car is emitting an unsafe odor, and what precautions drivers should take when they’re on the road in order to avoid an emergency situation.

The smell of gasoline

Gasoline is a combustible mixture of hydrocarbons and additives that produce the gasoline smell we all know too well.

The standard mixture used today by gas stations emits odors consisting of more than 100 different chemicals, many of which are toxic and/or carcinogenic.

This is why public health authorities warn about possible problems associated with inhaling gasoline fumes.

The smell of gasoline can be so strong that it’s possible to become overwhelmed by it, especially if you’re in an enclosed space such as a garage, or if you’re filling up at a gas station.

How do I know if my car is leaking gas?

If you have a leak, the smell of gasoline will often be overwhelming, but can also be subtle depending on the type of leak. You may also notice wetness or pooling of fluid underneath the car.

If you have any concerns that your automobile might have a gas leak, take it to a qualified mechanic to have it inspected and repaired immediately.

It is not recommended that you attempt a do-it-yourself repair unless you are experienced with vehicle repairs, and you are aware of the dangers associated with gasoline fumes.

Is there anything else I should know about how gasoline smells?

The strength of gasoline’s odor differs by region and by fuel brand.

The smell of gasoline varies thanks to the different mixtures of chemicals that are created during the refining process.

Esso petrol station
Different fuel brands have different blends of gasoline, leading to differing smells

Factors such as rain and humidity also play a role in how strong the odor of gas is once it has been released.

Top reasons your vehicle might smell like gas

There are a multitude of reasons that can cause a car to smell like gas, and some of them are more concerning than others.

Here are the top four reasons that we see most often:

  • The engine is not burning the fuel completely thanks to the mixture of air and fuel being incorrect. This can cause a gasoline odor to come from the exhaust pipe, and is usually caused by something as simple as a dirty air filter.
  • There may be a leak in the fuel system, such as a crack in the fuel tank or a loose hose connection.
  • The evaporative emissions control system may be faulty.
  • The catalytic converter may be damaged and not working properly.

It can be tricky to diagnose what the cause of the smell is. Mechanics are best placed to take a look and determine the source of the smell, and understand whether or not it poses any danger.

Is it safe to drive a car that smells like gas?

In the majority of cases it is safe to continue driving a car that smells like gas until you’re able to get it repaired, but you should always get the car checked out by a professional as soon as possible to rule out any potentially dangerous problems.

Numerous automotive experts admit that many people do continue to drive their cars even when they smell like gas.

A surprising number of people routinely commute back and forth to work every day for months without having any problems.

Sometimes these people are unaware that they even have an issue, and simply put it down to having a particularly smelly car. It can take somebody pointing out the problem to them before they realize that something is amiss.

Pungent cars are more common than they may seem, and these days automobile manufacturers incorporate diagnostics systems into cars’ onboard computer systems to detect when there is a leak or when the fuel isn’t being burnt as it should be.

This means that the most serious issues will be detected by your car before you become aware, and you will be notified with an illuminated engine warning light.

What do you do if you smell gas in your car?

If you smell gas in your car, there are a few things that you can do to try and determine the source of the odor:

  • Check that you re-fitted the fuel cap correctly after filling up.
  • Check all of the hoses and connections in the engine bay for leaks.
  • Look under the car for leaking gasoline or stains on the ground.
  • Check the exhaust pipe while the engine is running to see if there is any trace of gasoline leaking.

The most important thing to remember when this happens is not to panic. Stay calm and if you start to smell gas while driving, pull over to the side of the road as soon as it is safe to do so.

Turn off the car and get out, making sure that you keep a safe distance from other vehicles on the road.

Broken down car
Pull over to investigate if you suddenly smell gas while driving

If you are concerned about your safety or the safety of others, call the emergency services and ask for assistance.

If you see fuel leaking, do not try to drive your car any further until you have spoken with a professional.

It’s always better to err on the side of caution if there’s any chance you’re endangering yourself by driving your car with a leak.

Final thoughts

As with most automotive issues, if you’re concerned that your car is emitting an unsafe gas odor, it’s best to take it to a mechanic for inspection.

There are many things that can go wrong with a car, and it’s important to determine the source of the smell and whether or not it poses any danger. This also allows you to gain an understanding of what needs to be fixed.

If you suddenly smell gas while driving, stay calm and pull over to the side of the road as soon as it is safe to do so.

If fuel is leaking it can be very dangerous, so don’t try to drive any further until you’ve spoken with someone about the issue.

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