Gas Coming Out of The Carburetor, See How to Fix It!

Posted on November 24, 2025 by Nur Wachda Mihmidati

Gas coming out of carburetor can be an annoying and even dangerous problem for your vehicle’s performance. When the carburetor is not functioning properly, it can lead to fuel wastage, poor performance, and even the risk of fire. Addressing this issue is a top priority for vehicle owners.

In this article TransTRACK , we will discuss the common causes of gasoline coming out of the carburetor and practical steps to resolve them. From simple treatments to more complex solutions, you’ll find out how to effectively address this issue.

Don’t let carburetor problems hamper your ride. Let’s learn together what can cause gasoline to come out of the carburetor and how to deal with it appropriately.

What Causes Gas Coming Out of the Carburetor

Many things can cause this fuel to come out of the carburetor. Here are some factors, including:

Incorrect Carburetor Assembly

If the carburetor is not assembled properly, leaks or problems in regulating fuel flow may occur.

Damage to the float needle

A damaged or worn float needle can interfere with fuel flow regulation, causing excessive gasoline to escape.

Broken Needle Valve Spring

A broken needle valve spring can cause the valve to not close properly, allowing gasoline to continue flowing into the carburetor.

Interference with the Carburetor Float

A stuck or pinched float can interfere with the normal functioning of the carburetor, which in turn can cause fuel to escape from the carburetor.

Leaking Carburetor Float

If the carburetor float leaks, the fuel will continue to flow into the carburetor and eventually out of it.

Damaged Gasoline Valve

A damaged or worn gasoline valve can cause an uncontrolled flow of fuel to the carburetor.

Excessive Fuel

If too much fuel is supplied to the carburetor, the carburetor may not be able to regulate the flow properly, allowing gasoline to escape through the carburetor.

It is important to check and repair any damaged or malfunctioning components to prevent excessive gasoline from escaping from the carburetor. In addition, regular maintenance and proper assembly are also very important to prevent this kind of problem from occurring.

How to Fix Gasoline Coming Out of the Carburetor

To solve the problem of gasoline coming out of the carburetor, you can take the following steps:

Resetting the Carburetor

Check your carburetor settings and ensure that each component is in the correct position. Readjust if necessary so that the fuel flow is properly controlled.

Replace the Inadequate Drain Hose

Make sure there are no leaks or cracks in the exhaust hose that connects the fuel tank to the carburetor. If any are damaged or in disrepair, replace them with new ones immediately.

Cleaning the float needle

Remove the float needle from the carburetor and carefully clean it with carburetor cleaning fluid. Make sure there is no dirt or scale that prevents the float needle from functioning properly.

Checking the Fuel

Check the quality of the fuel you are using. Make sure there are no impurities or contaminants in it that can cause problems with the carburetor.

Replace Good Fuel

If the fuel used is contaminated or unfit, replace it with fresh, clean fuel immediately.

Reduce Excessive Fuel

If your carburetor is receiving too much fuel, adjust the settings to make the fuel flow more controlled. This can be done by paying attention to the carburetor settings or repairing any damage that is causing excessive fuel flow.

By taking the above steps, you can solve the problem of gasoline coming out of the carburetor and ensure that the carburetor is functioning properly. If the problem is still persistent, you may need to check further or consult a skilled mechanic.

Impacts If The Problem is Not Addressed Immediately

The problem of gasoline escaping from the carburetor not only causes inconvenience in driving, but can also have serious repercussions if not addressed immediately. It is important to understand the consequences of allowing this problem to continue, as damage to vehicle components can affect performance and even safety. Here are some of the impacts that can occur if the problem of gasoline coming out of the carburetor is not addressed immediately.

1. Engine Damage

Fuel Buildup: As gasoline continues to flow out of the carburetor, fuel can build up in the combustion chamber or combustion line. This can lead to incomplete combustion, which can eventually damage engine components such as pistons, piston rings, and valves.
Loss of Engine Power: Engines that are constantly exposed to excess fuel tend to lose power and performance, and may even stall while driving, reducing comfort and safety on the road.

2. Fire Risk

Gasoline Leaks: Gasoline spilling or leaking from the carburetor can get onto hot engine parts, potentially starting a fire. Given the highly flammable nature of fuel, fuel leaks can pose a very serious fire risk, whether the vehicle is running or parked.
Spread of Fire: If gasoline leaks and hits other parts of the vehicle, the fire can spread quickly, potentially damaging the vehicle completely. Vehicle fires are dangerous for both drivers and passengers.

3. Wasteful Fuel Consumption

Fuel Wasting: When gasoline flows out uncontrollably, the engine requires more fuel to function. This causes the vehicle to be very wasteful in fuel consumption, which increases long-term operating costs.
Economic Loss: Not only does it cause damage to the engine, but constant fuel wastage can also be bad for your budget, as the vehicle becomes fuel inefficient.

4. Decrease in Vehicle Performance

Unstable Vehicle: Unstable and excessive gasoline flow may cause the air and fuel mixture settings to be suboptimal. As a result, the vehicle may experience symptoms such as loss of power, poor acceleration, or an unresponsive engine.
Rough Engine Symptoms: An engine that receives too much fuel can make the combustion process not smooth, resulting in a rough shaking engine or even a sudden stop in the middle of a trip.

5. Other Component Damage

Blockages in the Combustion System: Spilled or leaked fuel can enter other combustion systems, causing blockages or damage to components such as spark plugs and fuel injectors.
Electrical Short Circuit: Gasoline leaks can also cause short circuits in the vehicle’s electrical system, especially if gasoline gets on the vehicle’s wiring or electronic components, potentially damaging the entire electrical system.

In troubleshooting gasoline coming out of the carburetor, ensuring your vehicle is in the best condition is key. By using TransTRACK’s Vehicle Maintenance System, you can easily track and schedule maintenance for your vehicle.

With the advanced features offered by TransTRACK, you can monitor fuel consumption, schedule routine maintenance, and receive alerts if a potential problem is detected with the carburetor or other parts. This helps you to prevent problems before they become major and ensure your vehicle keeps running smoothly.

Don’t let problems with gasoline coming out of the carburetor interrupt your journey. Get TransTRACK now and enjoy a safe and reliable vehicle every time.

FAQ

Why does gasoline leak from the carburetor?

Gasoline can leak from the carburetor when the fuel control system inside is not working properly. Generally, problems occur because the float is unable to shut off the flow of gasoline, the float needle is worn, or the carburetor gasket is hardened and no longer tight. Dirt in the float chamber can also cause the float needle to stick, causing gasoline to overflow and leak through the drain hole or air filter.

What are the signs of a damaged carburetor float?

A damaged carburetor float usually shows symptoms such as gasoline continuing to flow even when the engine is off, carburetor flooding, difficulty starting the engine, unstable idling, and a strong smell of gasoline around the engine. Sometimes the engine may stall when accelerating because the gasoline supply becomes excessive.

How do you fix gasoline leaking from the carburetor?

To fix a gasoline leak in the carburetor, the main step is to open the carburetor and check the condition of the float and float needle. If the float is bent or broken, it must be adjusted or replaced. A worn float needle also needs to be replaced so that it can shut off the fuel flow properly. Cleaning the float chamber of debris and ensuring that all gaskets are tightly fitted is important to prevent re-leaking. After that, readjusting the float level is often necessary to restore normal fuel supply.

Can a leaky carburetor prevent the engine from starting?

Yes, a leaky carburetor can make it difficult for the engine to start or even prevent it from starting altogether. When the carburetor floods, the fuel mixture becomes too rich, causing the spark plugs to get wet quickly and fail to ignite. In addition, excess gasoline interferes with the air flow, preventing the combustion process from occurring properly.

How much does it cost to service a motorcycle carburetor?

The cost of motorcycle carburetor service varies depending on the type of motorcycle and the extent of damage. For minor services such as cleaning, the cost is usually relatively inexpensive. If parts such as the float needle, gasket, or the float itself need to be replaced, the total cost may increase. A complete carburetor service is generally affordable and is one of the important routine maintenance tasks for maintaining motorcycle performance.