Updated at: 05-03-2022 - By: micdot

Modern automobiles have sealed gas tanks, so you’ll be aware of this fact if you own or are familiar with these vehicles. The purpose of this feature is to keep air out of the tank. As a result, if your car is leaking air, it signifies that some of it has made its way into the cabin. You may, however, be curious as to the nature of its consequences and the best course of action. So, the question is:
What happens if there is air in a gas tank? If a gas tank has air in it, this could indicate that the vapors are not returning to the engine. Tank pressure can be increased by adding air to the mix. Stalls can be caused if air bubbles start forming, and your automobile may then be unable to start at all.

When it comes to modern vehicles, there’s a good reason why the gas tanks are airtight. The pressure can rise if there is any air inside. Stalling can occur as a result of fuel bubbles that form. Stalls and shutdowns can occur if the bubbles in the engine continue to build. The effects of having air in your gas tank are discussed in detail in this article. This manner, you’ll be aware of the potential dangers. Furthermore, you’ll be prepared in the event that something like this does arise. That being said, let’s get this party started.

What Happens When Air Gets in Your Gas Tank?

Fuel line air bubbles can be caused by air entering your gas tank. Inefficient combustion can be caused by these bubbles. As a result, your car’s engine may stall out while you’re driving. Additionally, it is susceptible to getting the hiccups.

If the bubbles continue to build and damage your engine, your vehicle may be rendered inoperable and unable to be started. As a result, your fuel lines must never be clogged with air. You’ll be able to drive more comfortably as a result. It’s understandable that you would worry if it’s a terrible idea to have air in your gas tank at all times.

Is It Bad to Get Air in Your Gas Tank?

Yes, it’s bad for your gas tank to have air in it. Because of this, the symptoms it creates, such hiccups and unwillingness to start, indicate an engine problem. The gas tank’s air causes pressure to build, as previously indicated. While it’s usual for gas tanks to build up pressure, this isn’t a good thing.

Because of this, most engines have a vapor recovery system. A spill or leak may result if you overfill your tank, for example.. If you inhale some of the vapor, you could be putting your health at risk. Another consideration is that such repairs can be quite costly, putting a strain on your finances.

What Causes Air in the Gas Tank?

Most of the air in your gas tank comes from gasoline that has evaporated but is still present in your tank. Since the vapors exert more pressure than the fuel does, the tank’s pressure rises even as the amount of fuel it holds decreases.

Another possibility is that your gas tank is leaking or has holes in it that allow air to get in. If that’s the case, you’ll want to get your engine fixed as quickly as possible. Otherwise, it could lead to even more problems down the road. You now need to figure out a way to remove the air from your gas tank. In the event that this ever happens to you, what should you do?

How Do You Get the Air Out of Your Gas Tank?

Purge the air from the low-pressure side of the fuel system to remove the air from your gas tank. After that, the fuel lines must be opened and the bleed ports downstream of your fuel pump allowed to function. It’s better to begin with the one closest to the pump and work your way out from there.. As long as the gasoline lasts, you should continue doing so. Make an appointment with a mechanic as soon as you see any signs of a tank leak or a hole.

Your engine will be safe and no more troubles will arise as a result of this malfunction. Here’s how you can tell if your gas tank is full of air.

Air in a Gas Tank Symptoms

If you suspect that your gas tank or fuel line contains air, you may notice the following signs.
Inability to begin

You should have your engine checked out by a professional if it experiences any of the following problems. As a result, your engine will be secure and you won’t have to deal with it again. Fuel lines should be free of obstructions at all times to ensure smooth operation of your vehicle. In addition, by doing so, you can ensure that your engine runs smoothly and efficiently for a long period.

Air Sound When Opening the Gas Cap – Is That Ok?

It is possible that when you open the gas cap, you will hear a hissing sound. As the air pressure and temperature rise, it’s normal to occasionally hear such noises. The best course of action would be to have it checked if you hear it frequently and your motor stalls and stops frequently. Assume you hear or feel the air sound when you open the cap. Gas tank vapors not returning to the engine is the most common cause of this problem.

Because of this, it’s in your best interest to have the problem diagnosed and repaired as soon as possible. A problem with your engine could result if you don’t address this issue right away. Additionally, it can have a negative impact on your engine’s long-term performance.

Engine Rebuild Cost


An engine and gasoline system suffer when there is excess air in the tank. The vapors may not be discharged back into the engine if the gas tank is full with air. A buildup of pressure could occur in the tank as a result of the air. Your car’s ability to start may be permanently damaged if it develops air bubbles.

There’s a good reason why the gas tanks of newer cars are insulated to keep out air. The pressure could grow if there is any air within. It’s possible that it’ll cause fuel bubbles, which could cause a breakdown. Bubbles in the engine will eventually cause it to slow down and halt. You should always seek the help of a professional if you see a hole or leak in your tank. Make an appointment with a mechanic as soon as possible to have your engine checked out. In this approach, you can make certain that your engine is secure and that the problem will not recur.