Mercedes-Benz AMG GT S Smells Like Gas

Common Causes of Fuel Odors in Your Mercedes-Benz AMG GT S and Essential Safety Precautions

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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 Mercedes-Benz AMG GT S 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 Mercedes-Benz AMG GT S 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. 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.

Troubleshooting Gas Smell in a Mercedes-Benz AMG GT S

When faced with a gas smell in your Mercedes-Benz AMG GT S, a methodical diagnostic approach is essential for effective troubleshooting. Start by inspecting the fuel system for any visible leaks, focusing on hoses, seals, and connections that may have deteriorated over time. If you notice any wet spots or strong odors near the fuel tank or engine, this could indicate a fuel leak that requires immediate attention. Next, examine the exhaust system for signs of damage or leaks, as exhaust issues can also contribute to a gas smell. Pay close attention to the exhaust manifold and joints, where cracks or loose fittings may allow fumes to escape. Additionally, check for vapor leaks in the fuel system, particularly around the fuel cap and vapor recovery system, as these can lead to gas odors inside the vehicle. If you identify any damaged components, such as delivery units or seals, consider replacing them to restore proper function. Remember, addressing these issues promptly is not only crucial for the performance of your vehicle but also for the safety of you and your passengers. By following this structured approach, you can effectively diagnose and resolve the gas smell in your AMG GT S, ensuring a safer and more enjoyable driving experience.

What Could Cause a Gas Smell in a Mercedes-Benz AMG GT S?

When you detect a gas smell in your Mercedes-Benz AMG GT S, it’s essential to consider several common problems that could be at play. One of the primary culprits is a fuel system leak, which can occur in various components such as fuel lines, injectors, or the fuel tank itself. Additionally, a malfunctioning gas cap may not seal properly, allowing fuel vapors to escape and create a noticeable odor. Another significant factor could be issues with the emissions control system, which is designed to minimize harmful emissions; if it fails, it can lead to gas smells and other performance issues. Furthermore, a failing catalytic converter can not only produce a gas smell but also trigger the check engine light, indicating that the vehicle may not pass emissions tests. It’s also important to be aware of gasoline leaks in the engine bay or undercarriage, which can pose serious fire hazards, especially since gasoline evaporates quickly and may not leave visible traces. Given the potential risks associated with these issues, it is crucial to address any gas smell promptly by consulting a qualified mechanic who can accurately diagnose and resolve the underlying problems, ensuring both your safety and the longevity of your vehicle.

Why is it Urgent to Address a Gas Smell in a Mercedes-Benz AMG GT S?

Addressing a gas smell in your Mercedes-Benz AMG GT S is not just a matter of comfort; it is a pressing safety concern that demands immediate attention. The presence of a gasoline odor can signal fuel leaks or other serious mechanical issues that could compromise the safety of both the driver and passengers. Ignoring this warning can escalate the risk of fire, particularly in a high-performance vehicle where heat and flammable materials are in close proximity. Moreover, delaying repairs can lead to more extensive damage, resulting in costly repairs that could have been avoided with prompt action. Beyond safety and financial implications, a gas smell can also indicate underlying performance issues that may hinder the vehicle's capabilities. Therefore, it is crucial to identify and rectify the source of the gas smell as soon as possible to ensure the longevity and optimal performance of your AMG GT S. Taking swift action not only protects your investment but also enhances your driving experience.

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Mercedes-Benz AMG GT S: Why It Smells Like Gas | RepairPal