2021 Mercedes-Benz AMG GT Smells Like Gas

Diagnosing Fuel Odors in Your 2021 Mercedes-Benz AMG GT: Causes and Solutions for a Safe Drive

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Reviewed by
Andrew Hajjar
Written by RepairPal Car Genius
Updated January 14, 2025
0%
15% chance it's the
Gas Cap
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40% chance it's the
Emissions Control System
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45% chance it's
Something else
The most common reasons a 2021 Mercedes-Benz AMG GT smells like gas are the gas cap, the fuel system, or the emissions control system.
  • Gas Cap: A loose or damaged gas cap can cause fuel vapors to escape, triggering the check engine light and potentially affecting fuel system pressure.
  • Emissions Control System: A faulty emissions control system can lead to increased hydrocarbon emissions and trigger the check engine light due to malfunctioning components like the EGR valve or O2 sensors.
Proper diagnosis will determine the exact cause of your symptom, saving you money on unnecessary repairs. The diagnostic experts at RepairPal Certified shops have the right tools and experience to solve any symptom.

How much does it cost to fix a 2021 Mercedes-Benz AMG GT smells like gas?

Common Repairs

The total repair cost will vary based on the condition of your vehicle and the number of repairs needed to fix your symptom. Proper diagnosis will save you money by finding the exact repairs needed to fix your car right the first time.

The check engine light will illuminate any time there is a failed EVAP system test. This will be indicated by the various on-board diagnostics trouble codes that are stored in the vehicle's memory. Also, in some models, there may be a popping sound accompanying the check engine light, as the leak detection pump continuously attempts to pressurize the fuel tank. The canister may also cause difficulty starting the engine, a rough idle, and poor fuel mileage.

When the fuel filter begins to clog, the engine suffers from fuel starvation. This will cause a significant reduction in power and may also cause a misfire. These conditions may be intermittent, or constant and worsen over time. As the issue progresses, the engine may being to stall immediately after starting, fail to start, hesitate under throttle, or stall at particular angles on hills.

The check engine light will illuminate any time there is a failed EVAP system test. This will be indicated by the various on-board diagnostics trouble codes that are stored in the vehicle's memory. Also, in some models, there may be a popping sound accompanying the check engine light, as the leak detection pump continuously attempts to pressurize the fuel tank. A fuel tank leak may also cause difficulty starting the engine, a rough idle, and poor fuel mileage. When a fuel tank is simply corroded to the point of failure, the exterior tank condition rarely shows damage. The inside of the fuel tank will be rusted or corroded, and rust flakes or other debris may be floating in the fuel.

For most vehicles, the only symptom will be a check engine light or fuel tank filler cap light illuminating on the driver instrument cluster. This is to signal that there is an evaporative emissions (EVAP) leak. In some situations, the vehicle may take longer than normal to start, or, more rarely, the engine may not start at all. on-board diagnostic (OBD) trouble codes will refer to EVAP system failures such as a small or massive EVAP system leak. Lastly, the powertrain control module may notice a lean running condition, which could even lead to random and infrequent misfires.

What could be causing a gas smell in a 2021 Mercedes-Benz AMG GT, and what steps should I take to diagnose the issue?

When faced with a gas smell in your 2021 Mercedes-Benz AMG GT, it's crucial to adopt a systematic diagnostic approach to pinpoint the issue effectively. Begin by inspecting the fuel system for any leaks, focusing on the fuel lines, tank, and injectors, as these are common culprits for gas odors. Next, check the fuel cap to ensure it is tightly sealed; a loose or damaged cap can easily allow gas vapors to escape. Additionally, examine the exhaust system for any leaks, as exhaust gases can sometimes mimic the smell of fuel inside the cabin. It's also important to assess the engine components, particularly the fuel injectors and carburetor, for any signs of malfunction that could contribute to the odor. If these preliminary checks do not uncover the source of the gas smell, seeking assistance from a qualified mechanic or dealership for a thorough inspection is advisable. By following this methodical approach, you can effectively diagnose and address the issue, ensuring the safety and performance of your vehicle.

What could be causing a gas smell in my 2021 Mercedes-Benz AMG GT?

If you're detecting a gas smell in your 2021 Mercedes-Benz AMG GT, it's crucial to identify the underlying cause to ensure your safety and the vehicle's integrity. One of the most common culprits is a fuel leak, which can stem from damaged fuel lines, faulty fuel injectors, or issues with the fuel tank itself. Addressing a fuel leak is vital, as it poses significant safety hazards. Another potential issue could be a faulty or loose fuel cap, which is designed to seal the fuel tank and prevent vapors from escaping; if it’s not functioning correctly, it can lead to noticeable gas odors inside the cabin. Additionally, problems within the exhaust system, such as leaks or a malfunctioning catalytic converter, can also contribute to a gas smell, as these components are responsible for directing harmful gases away from the vehicle. Furthermore, the evaporative emissions system, which controls fuel vapor release, may have issues like a faulty charcoal canister or purge valve, leading to similar odors. Lastly, an engine misfire can cause unburned fuel to enter the exhaust system, resulting in a gas smell, often accompanied by symptoms like rough idling or a check engine light. If you encounter this issue, it’s advisable to consult a qualified mechanic for a thorough inspection to diagnose and resolve the problem effectively.

How urgent is it to address the gas smell in my 2021 Mercedes-Benz AMG GT?

Addressing a gas smell in your 2021 Mercedes-Benz AMG GT is an urgent matter that should not be overlooked. The presence of gas fumes can indicate a serious malfunction within the fuel system, which poses significant safety risks, including the potential for fire hazards. Additionally, inhaling gas vapors can lead to health issues such as dizziness, headaches, and nausea, making it imperative to act swiftly. Ignoring this warning sign can result in further damage to your vehicle, leading to costly repairs and more extensive issues down the line. Therefore, if you detect a strong gas odor, it is crucial to stop driving immediately and consult a qualified mechanic to diagnose and resolve the problem. Prioritizing this issue not only ensures your safety but also protects the integrity of your vehicle.

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2021 Mercedes-Benz AMG GT Gas Smell Causes & Repairs