2016 Mercedes-Benz GL63 AMG Smells Like Gas

Diagnosing Fuel Odor Issues in Your 2016 Mercedes-Benz GL63 AMG and Essential Safety Precautions

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Reviewed by
Bo Fader
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 2016 Mercedes-Benz GL63 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 2016 Mercedes-Benz GL63 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. 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 are the potential causes and diagnostic steps for a gas smell in a 2016 Mercedes-Benz GL63 AMG?

When faced with a gas smell in your 2016 Mercedes-Benz GL63 AMG, it's essential to adopt a systematic diagnostic approach. Start with a visual inspection of the vehicle, looking for any obvious signs of fuel leaks around the fuel tank, fuel lines, and injectors. Next, check the fuel cap to ensure it is securely fastened, as a loose or damaged cap can allow gas vapors to escape. If these initial checks do not reveal the source of the smell, utilize a diagnostic scanner to identify any error codes that may indicate issues with the fuel system or emissions components. Additionally, inspect the exhaust system for any leaks or damage, as these can also contribute to a gas odor. Finally, pay attention to the engine's performance; signs of misfiring or rough idling may suggest incomplete combustion, which can produce a gas-like smell. By following this structured approach, you can effectively narrow down the potential causes and take the necessary steps to resolve the issue.

What could be causing a gas smell in my 2016 Mercedes-Benz GL63 AMG?

If you're detecting a gas smell in your 2016 Mercedes-Benz GL63 AMG, it's crucial to understand the common problems that could be at play. One of the primary culprits could be a fuel leak, which may stem from a compromised fuel injector, damaged fuel line, or even a leaking fuel tank. Such leaks not only pose a risk of fire but can also lead to decreased fuel efficiency. Another potential issue is a faulty fuel cap; if it's loose, damaged, or missing, it can allow fuel vapors to escape, creating that unmistakable gas odor. Additionally, problems with the evaporative emissions control system, which is responsible for capturing and recirculating fuel vapors, can also lead to a gas smell. This might involve a malfunctioning charcoal canister or purge valve. Furthermore, don't overlook the exhaust system; leaks or issues with the catalytic converter can sometimes produce a gas-like smell inside the cabin. Lastly, an engine misfire can result in unburned fuel entering the exhaust, contributing to the odor. If you encounter this issue, it's advisable to conduct a thorough inspection or consult a qualified mechanic to ensure your vehicle remains safe and functional.

How urgent is it to address the gas smell in my 2016 Mercedes-Benz GL63 AMG?

Addressing a gas smell in your 2016 Mercedes-Benz GL63 AMG is not just a matter of convenience; it is an urgent safety concern that should not be overlooked. Gas leaks can create a serious fire hazard, putting both you and others at risk. Additionally, inhaling gas fumes can lead to a range of health issues, including dizziness, headaches, and nausea, which can impair your ability to drive safely. Beyond immediate health and safety risks, neglecting this issue can result in further damage to your vehicle, leading to costly repairs down the line. Therefore, if you detect a gas smell, it is imperative to take action immediately. While some DIY troubleshooting may be possible, seeking professional assistance is highly recommended to accurately diagnose and resolve the issue, ensuring your safety and the longevity of your vehicle.

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2016 Mercedes-Benz GL63 AMG Gas Smell Causes & Repairs