2024 Mercedes-Benz GLS450 Smells Like Gas

Diagnosing Fuel Odors in Your 2024 Mercedes-Benz GLS450: Causes and Solutions for a Safe Drive

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Reviewed by
Devin Cabugcal
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 2024 Mercedes-Benz GLS450 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 2024 Mercedes-Benz GLS450 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 and diagnostic steps for a gas smell in a 2024 Mercedes-Benz GLS450?

When you detect a gas smell in your 2024 Mercedes-Benz GLS450, it's crucial to act quickly and methodically to identify the source of the issue. Start with a thorough visual inspection of the vehicle, looking for any obvious signs of fuel leaks under the car or around the engine compartment. Pay particular attention to the fuel lines, as any cracks or damage can lead to leaks that produce a gas odor. Next, consider using a diagnostic scanner to check for any error codes that may indicate problems with the fuel system or emissions components. If you have access to a fuel pressure gauge, testing the fuel injectors can help determine if they are functioning correctly, as a malfunctioning injector can lead to unburned fuel and a noticeable gas smell. Finally, don’t overlook the exhaust system; inspect it for any leaks or damage that could allow exhaust gases to enter the cabin. By following these steps, you can effectively diagnose the cause of the gas smell and take appropriate action to resolve the issue, ensuring both your safety and the proper functioning of your vehicle.

What could be causing a gas smell in my 2024 Mercedes-Benz GLS450?

If you're experiencing a gas smell in your 2024 Mercedes-Benz GLS450, it's essential to identify the underlying issues that could be causing this alarming odor. A common culprit is a fuel leak, which may arise from a damaged fuel line, a faulty fuel injector, or problems with the fuel tank itself. Additionally, the evaporative emissions system, responsible for controlling fuel vapor release, can malfunction and lead to noticeable gas smells. Another area to investigate is the exhaust system; leaks or issues with components like the catalytic converter can allow gas-like fumes to enter the vehicle's cabin. Lastly, overfilling the gas tank can result in gasoline spilling, creating a strong odor both inside and outside the car. It's vital to address these concerns promptly to ensure your safety and maintain your vehicle's performance, so seeking a professional mechanic's expertise for a thorough inspection is highly recommended.

How urgent is it to address a gas smell in a 2024 Mercedes-Benz GLS450?

Addressing a gas smell in your 2024 Mercedes-Benz GLS450 is not just a matter of inconvenience; it is a pressing safety concern that requires immediate attention. Gas leaks can lead to catastrophic outcomes, including the risk of fire, which endangers not only the driver and passengers but also others on the road. Moreover, the inhalation of gas fumes poses serious health risks, with symptoms ranging from mild discomfort to severe health complications over time. Ignoring this warning sign can also result in further damage to your vehicle, leading to expensive repairs that could have been avoided with timely intervention. Therefore, if you detect a gas smell, it is imperative to seek professional assistance without delay to diagnose and rectify the issue, ensuring both your safety and the longevity of your vehicle.

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2024 Mercedes-Benz GLS450 Gas Smell Issues & Solutions