Mercedes-Benz GLE63 AMG S Smells Like Gas

Diagnosing Fuel Odor Issues in Your Mercedes-Benz GLE63 AMG S and Essential Safety Measures to Take

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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 Mercedes-Benz GLE63 AMG 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 GLE63 AMG 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.

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 GLE63 AMG S

When faced with a gas smell in your Mercedes-Benz GLE63 AMG S, it's essential to adopt a methodical diagnostic approach to identify the source of the issue. Start by inspecting the gas cap, as a loose or damaged cap is a common and easily fixable cause of fuel odors. Ensure it is tightly sealed and in good condition. Next, examine the fuel system for any visible leaks, particularly around hoses and the fuel pump seal, as these areas are prone to wear and can lead to gas smells. If the fuel system appears intact, turn your attention to the emissions control system, which plays a crucial role in managing fuel vapors; a malfunction here could also contribute to the odor. Additionally, consider the air conditioning system, as a gas smell when the A/C is activated may indicate a leak that requires further inspection. Lastly, if the smell persists, check for mildew buildup in the A/C system, which can sometimes mimic a gas odor. Running hot outside air through the system can help mitigate this issue. By following this structured approach, you can effectively diagnose and address the gas smell in your vehicle, ensuring a safer and more pleasant driving experience.

What Could Cause a Gas Smell in a Mercedes-Benz GLE63 AMG S?

When you detect a gas smell in your Mercedes-Benz GLE63 AMG S, it’s crucial to investigate the underlying causes to ensure both safety and vehicle performance. One common issue could be a faulty gas cap, which may not seal properly, allowing fuel vapors to escape. Additionally, problems within the fuel system, such as leaks in the fuel lines or a malfunctioning fuel pump, can lead to noticeable gas odors. Another area to consider is the emissions control system; if components like the charcoal canister are damaged or clogged, they can contribute to gas smells inside the cabin. Lastly, pay attention to the low-pressure fuel hose, as Mercedes-Benz has acknowledged concerns regarding this part and extended warranties due to its potential to cause gas odors. By systematically checking these components, you can identify the source of the smell and take appropriate action, whether that involves a simple fix or seeking professional assistance.

What to Do If Your Mercedes-Benz GLE63 AMG S Smells Like Gas?

If your Mercedes-Benz GLE63 AMG S emits a gas smell, it’s crucial to act swiftly, as neglecting this issue can lead to serious safety hazards and costly repairs. A gas odor may indicate a loose or damaged gas cap, which can allow harmful fuel vapors to enter the cabin, posing health risks to you and your passengers. Additionally, leaks in the fuel system or issues with the emissions control system can not only compromise vehicle performance but also increase the risk of fire. Therefore, it’s essential to inspect the gas cap and fuel system components immediately. If you notice persistent odors or cannot identify the source, seeking professional assistance is vital. A qualified mechanic can conduct a thorough inspection, ensuring that any underlying issues are addressed before they escalate into more significant problems. Prioritizing these steps not only enhances your vehicle's safety but also protects your investment in the long run.

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Why Your Mercedes-Benz GLE63 AMG S Smells Like Gas