Everyone depends on their car for many things. For many people, their car or truck is how they get to work or even how they transport their family. Can you imagine the trouble it would cause if your car stopped running in the morning? 

A gas leak in your car could actually cause that problem when you least expect it. Today we will discuss how to know when you have a fuel leak, what to do about it and how much it will cost to fix a gas leak in a car. 

Gas line repairs in cars cost on average $90 to fix. The cheapest fix would cost $60 for a simple gas line repair. The most expensive would cost $120 for a gas line replacement.

Of course, there is an entire fuel system to be considered with many varied and complicated parts. You will also need to consider a problem in the gas tank or fuel injector system, and still there are other reasons for gas leaks in a car. 

How Do I Know If My Car Is Leaking Gas?

Sometimes, it is easy to tell when you have a fuel leak in your car, other times, it may not be so obvious. Here is how you can be sure whether or not you have a gas leak in your car.

  • Color: Gas leaks are usually clear, however, some gas additives may cause the gas to be a dark color, even black in appearance. 
  • Odor: We all know the smell of gas. In fact, you may be able to tell you have a fuel leak before you actually see it, by the smell of gas. You should not be smelling gas while you are driving, if you do, this indicates that you likely have a fuel line leak. 
  • Disappearing gas: If you notice that your gas is gone too quickly or that it seems to disappear overnight, this is a good indicator that you have a gas leak.

One easy way to help figure out if your car is indeed leaking gas is to place a piece of newspaper or cardboard under your car.

This is a great idea, because it keeps slippery fluids from collecting on the ground and becoming a hazard, plus it lets you know a lot more about the liquid coming from your vehicle. You will be able to clearly see the color and notice any smell coming from the liquid. 

Can I Drive My Car If It is Leaking Gas?

It is never safe to drive a car with a gas leak. The car will still run, technically speaking, however, it is absolutely not safe to drive. A car with a fuel leak can cause a hazard for other drivers as any fuel left on the ground is slippery and may cause accidents.

Potentially, the vehicle could catch fire or even explode causing serious damage to yourself and others, and could even result in death. This is a risk that is not worth taking.

How Much Will It Cost To Fix a Gas Leak in My Car?

There are many things that can cause a gas leak and many places that gas can leak from in a car. Each of these things will come with a different price tag and of course, the make and model of your car, as well as the mechanic that you choose will play a huge part in determining the final price that you will pay.

What Causes Gas Leaks in Cars?

  • Fuel Lines: The most likely reason that your car would be leaking gas is that you have a leak in your fuel lines. They have a tendency to crack or break as they age. Basic wear and tear can cause this damage alone with enough time.
  • Gas Tank: Another common place to find a gas leak occuring is in the gas tank. Often age alone can allow for corrosion of your gas tank, but collisions, potholes and even sabotage are often culprits of gas tank damage as well. 
  • Fuel Injection System: This is the system responsible for helping move the gas, and there are seals and O rings within this system. It is not uncommon for these seals and O rings to crack due to age. 

Fuel Lines Repair Cost

A busted fuel line is the most likely reason that your car is leaking fuel. If this happens to be the case you might get away with just $50 to $70 to repair the line. You will be looking at closer to $100 to $120 if you need to have the fuel line replaced entirely.

Gas Tank Replacement Cost

If damage to your gas tank has caused a leak, and you want to replace the gas tank it will likely cost you between $1,300 and $1,400.

Gas tanks themselves cost around $1,000, but that will depend somewhat on the make and model of your car. The mechanics labor for a job like this to be well done will generally average between $250 and $350.

Can a Leaking Gas Tank Be Repaired?

Yes, in many cases a leaking gas tank can be repaired. You will need to clean the tank before attempting to repair it.

Cleaning the tank is an intensive process that involves draining any remaining gas, removing the tank, then cleaning it and then repairing it. Any mistake in this process could cause serious and expensive problems. This is best left for a seasoned mechanic. 

Can I Use Stop Leak In My Gas Tank?

For hairline cracks, pinholes and very small holes under around half of an inch, stop leak may be effective. However, it is easy to use too much stop leak and this will permanently damage

your engine. While the stop leak will stop small leaks in your gas tank, it can also clog up small parts such as fuel injectors. 

How Much Does It Cost To Fix Fuel Injectors In a Car?

The cost of the parts to replace fuel injectors varies dramatically between makes and models of cars. The parts can run anywhere from $150 to $600 and even beyond. The labor for the job is likely to be around $200 to $300 no matter what kind of car you drive.

What About Bad Gas?

There are many different issues that can occur with the fuel itself. This may mean that your fuel problem is not a leak, but is the actual gas itself. Here are some common problems related to bad gas.

  • Old Gas: In old vehicles being remodeled or in second (or spare) cars, it is not uncommon for gas to sit in the tank for a long time. If gas has sat in the tank for weeks or even longer, it’s chemical composition can change and cause the gas to be bad. This can often be rectified by gasoline additives that will help to stabilize the gas. 
  • Gas Mixed with Water: If damage has caused water to be present in your gas tank, it will cause your engine to “sputter.” This can damage your engine and you will need to make an appointment with a mechanic, to check the tank and the water pump.
  • Rust in Gas: If your fuel tank has rusted, the particles of rust may travel with the gas through the fuel injectors and into the engine. It can cause a blockage in the injectors, the engine or the fuel filter.
  • Sugar in Gas: Sabotage is more common than we would like to think. If someone puts sugar in your gas tank, This can do serious damage to your fuel pump. If you believe that this has happened to you, you will want to visit an auto shop or mechanic immediately. 

How Much Does It Cost to Fix Bad Gas in a Car?

If you have gotten bad gas in your vehicle (other than just old gas), you will need to have the fuel system flushed. This is an expensive job. For some cars this can cost as little as $400, but it can cost much more, up to $1,600 and even beyond in some luxury vehicles. 

How Do I Fix a Gas Leak in My Car?

A gas leak in a car is very dangerous, no matter what the cause. Gasoline is both flammable and combustible, so you should not drive your car with a fuel leak. Do not wait to have a gas leak in your vehicle repaired

Repairs to fuel lines, fuel injectors, and gas tanks are complex and multifaceted. Your mechanic will inspect the car’s fuel system and check for leaks, damage, and other issues. They can make the needed repairs properly and get you back on the road again. 

While a stop leak might be an occasional fix, the possibility of the damage that it might do to your car is not really worth the risk. There is no quick fix when your car has a gas leak. Set an appointment to see your mechanic and have the job done right.

Dealing with car-related issues like changing your mind after signing a car lease, buffing your car, or disabling a seat belt alarm can be overwhelming. Prioritizing safety and seeking the assistance of a qualified mechanic is important. By being informed and proactive, you can help keep yourself and others safe on the road.


Welcome to my car seat blog! As a mom of 3, I put together with other hard-working moms a highly informative one-stop car seat resource, full with many reviews and buyer guides. I hope you find it invaluable. Thank you for trusting me & my team! - Keren

Keren Simanova

Welcome to my car seat blog! As a mom of 3, I put together with other hard-working moms a highly informative one-stop car seat resource, full with many reviews and buyer guides. I hope you find it invaluable. Thank you for trusting me & my team! - Keren