2021 Mercedes-Benz G63 AMG Smells Like Gas

Diagnosing Fuel Odors in Your 2021 Mercedes-Benz G63 AMG: Causes and Solutions for a Safe Drive

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Reviewed by
Aisha
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 G63 AMG 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 G63 AMG 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.

A failing catalytic converter can cause a vehicle to fail emissions tests and turn on the check engine light. The exhaust might have an unusual smell. A restricted catalytic converter can result in a loss of engine power.

» LEARN MORE: How to tell if your catalytic converter is failing

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 are the potential causes of a gas smell in a 2021 Mercedes-Benz G63 AMG, and how should I diagnose the issue?

When faced with a gas smell in your 2021 Mercedes-Benz G63 AMG, it's essential to adopt a systematic diagnostic approach to identify the underlying issue. Start with a visual inspection of the fuel system, looking for any obvious signs of leaks around the fuel lines, fuel tank, and fuel cap. A loose or damaged fuel cap is a common culprit that can easily be overlooked, so ensure it is securely fastened. If the check engine light is illuminated, utilizing an OBD-II scanner can provide valuable error codes that may point to specific problems within the fuel system. Pay particular attention to the evaporative emissions system, as malfunctions in components like the charcoal canister or purge valve can lead to gas odors. Additionally, consider the possibility of exhaust system issues or engine misfires, which can also contribute to the smell of fuel. If these initial checks do not reveal the source of the problem, it may be prudent to consult a qualified mechanic for a more thorough inspection. By following this structured approach, you can effectively diagnose and address the gas smell in your vehicle.

What are the common causes of a gas smell in a 2021 Mercedes-Benz G63 AMG?

When you detect a gas smell in your 2021 Mercedes-Benz G63 AMG, it’s crucial to identify the underlying issues to ensure both safety and vehicle performance. One of the most common culprits is fuel leaks, which can occur in various parts of the fuel system, including the fuel tank, lines, or injectors. Inspect these areas for any signs of leakage, such as wet spots or a strong odor near the fuel components. Additionally, a faulty fuel injector may not deliver fuel correctly, leading to an unpleasant smell; checking for any irregularities in injector performance can help diagnose this issue. Another area to consider is the evaporative emissions system, which manages fuel vapor release; if this system is malfunctioning, it can cause gas odors inside the cabin. Furthermore, exhaust system problems, such as leaks, can also allow gas smells to enter the vehicle. Lastly, be mindful of overfilling the gas tank, as this can lead to fuel spillage and subsequent odors. If you encounter a gas smell, it’s advisable to conduct a thorough inspection or consult a qualified mechanic to address any potential hazards effectively.

How urgent is it to address a gas smell in a 2021 Mercedes-Benz G63 AMG?

Addressing a gas smell in your 2021 Mercedes-Benz G63 AMG is not just a matter of inconvenience; it is a critical safety concern that requires immediate attention. Gas leaks pose a significant risk of fire or explosion, particularly in the confined space of a vehicle, making it essential to act swiftly. Additionally, inhaling gas fumes can lead to serious health issues, including dizziness, nausea, and headaches, which can escalate with prolonged exposure. Beyond the immediate dangers, ignoring a gas smell can result in further damage to your vehicle's components, leading to expensive repairs down the line. Therefore, if you detect a gas odor, it is imperative to seek professional assistance without delay to ensure both your safety and the integrity of your vehicle.

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2021 Mercedes-Benz G63 AMG Gas Smell Causes & Solutions