2015 Mercedes-Benz GL63 AMG Smells Like Gas

Gas smell issues in 2015 Mercedes-Benz GL63 AMG and solutions to address them

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Reviewed by
Aisha
Written by RepairPal Car Genius
Updated January 14, 2025
0%
15% chance it's the
Gas Cap
0%
40% chance it's the
Emissions Control System
0%
45% chance it's
Something else
The most common reasons a 2015 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 2015 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 initial diagnostic steps should be taken to identify the source of a gas smell in a 2015 Mercedes-Benz GL63 AMG?

When faced with a gas smell in your 2015 Mercedes-Benz GL63 AMG, it's crucial to adopt a systematic diagnostic approach to identify the source of the issue. Begin by visually inspecting the area around your vehicle for any obvious signs of fuel leaks, such as puddles or stains on the ground, which can indicate a leak in the fuel system. Next, check the fuel cap to ensure it is securely tightened, as a loose or damaged cap can often lead to gas odors inside the cabin. Moving on, examine the fuel lines located beneath the vehicle for any signs of wear or damage, as compromised fuel lines are a common culprit for gas smells. Additionally, inspect the fuel injectors for leaks, as faulty injectors can contribute to the issue. Don’t forget to check the fuel tank itself for any signs of damage or leaks, as this can also be a source of the odor. Finally, utilizing a diagnostic scanner to check for error codes related to the fuel system can provide further insights into any underlying issues. By following these steps, you can effectively narrow down the source of the gas smell and take the necessary actions to resolve the problem.

What could be causing a gas smell in my 2015 Mercedes-Benz GL63 AMG?

If you're detecting a gas smell in your 2015 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, a damaged fuel line, or even a leaking fuel tank. Additionally, a faulty or loose fuel cap can allow fuel vapors to escape, leading to noticeable odors inside the vehicle. Another area to investigate is the exhaust system; leaks or issues with components like the catalytic converter can inadvertently allow gas smells to permeate the cabin. Furthermore, the evaporative emissions system, designed to manage fuel vapors, might be malfunctioning, contributing to the odor. Lastly, an engine misfire can result in incomplete combustion, producing a gas smell as well. Addressing these issues promptly is essential for both safety and vehicle performance, and while some DIY diagnostics can be performed, consulting a qualified mechanic is advisable for a thorough inspection and resolution.

How urgent is it to address the gas smell in my 2015 Mercedes-Benz GL63 AMG?

When you detect a gas smell in your 2015 Mercedes-Benz GL63 AMG, it is imperative to act swiftly due to the serious safety risks involved. Gas leaks not only pose a significant fire hazard but can also lead to health issues from inhaling toxic fumes. If you notice this smell, it is crucial to inspect your vehicle immediately. Start by checking for visible leaks around the fuel lines, connections, and the fuel tank. If you are comfortable, you can also examine the fuel injectors and the engine bay for any signs of wear or damage. Remember, neglecting this issue can lead to more severe problems, including costly repairs and potential harm to yourself and others. Therefore, addressing the gas smell promptly is not just a matter of vehicle maintenance; it is a vital step in ensuring your safety and the longevity of your car.

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