Mercedes-Benz GLK350 Smells Like Gas

Diagnosing Fuel Odor Issues in Your Mercedes-Benz GLK350 and Essential Safety Measures to Take

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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
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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 GLK350 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 GLK350 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 GLK350

When faced with a gas smell in your Mercedes-Benz GLK350, it's crucial to adopt a systematic diagnostic approach to ensure safety and effective resolution. Start by inspecting the fuel lines and connections for any visible signs of leaks, as these are often the most straightforward issues to identify. Check the fuel tank and surrounding areas for any dampness or stains that could indicate a leak. If the smell persists, examine the engine bay for any signs of fuel residue or damaged components, as these can also contribute to the problem. Pay particular attention to the rear passenger side of the engine, where common issues may arise. If you are unable to locate the source of the smell through these initial checks, consider inspecting the exhaust system for any leaks or malfunctions, as exhaust gases can sometimes mimic a gasoline odor. Should these steps not yield results, it may be time to consult a professional for a more thorough inspection, as some issues may not be easily visible. By following this methodical approach, you can effectively troubleshoot the gas smell in your GLK350 while ensuring your safety and the longevity of your vehicle.

What Could Cause a Gas Smell in a Mercedes-Benz GLK350?

When your Mercedes-Benz GLK350 emits a gas smell, it can be concerning and may indicate several underlying issues that require attention. One of the most common culprits is a faulty gas cap; if it is loose, damaged, or not sealing properly, it can allow fuel vapors to escape, creating a noticeable odor. Additionally, problems within the fuel system, such as leaks or a failing fuel pump seal, can lead to a gas smell that permeates the vehicle. The emissions control system is another area to investigate; a malfunctioning catalytic converter can not only produce a gas odor but may also trigger the check engine light. Furthermore, the charcoal canister, which is designed to capture unburnt fuel vapors, can become saturated over time and may need replacement if it is contributing to the smell. Other factors, including fuel leaks, exhaust issues, or vapor escapes, can also play a role in this problem. If you detect a strong gasoline smell, it is crucial to address the issue promptly to ensure safety and prevent further damage to your vehicle. While some DIY enthusiasts may feel comfortable inspecting these components, consulting a professional mechanic for a thorough diagnosis is often the best course of action to effectively resolve the gas smell.

What to Do If Your Mercedes-Benz GLK350 Smells Like Gas?

When you detect a gas smell in your Mercedes-Benz GLK350, it is crucial to act swiftly to mitigate safety risks and prevent further damage. Ignoring this warning sign can lead to severe consequences, including fire hazards and costly repairs. Start by ensuring your safety: pull over to a secure location, turn off the engine, and allow the vehicle to cool down. Next, conduct a thorough inspection of the engine bay and undercarriage for any visible fuel leaks, as gasoline can evaporate quickly, making leaks difficult to spot. If you cannot identify the source of the smell or suspect a leak, it is wise to consult a professional mechanic who can perform a comprehensive evaluation. Common culprits for gasoline odors in GLK350 models, particularly those manufactured between 2010 and 2015, include fuel leaks, exhaust issues, or vapor escapes. Addressing these problems promptly not only safeguards your vehicle's performance but also protects your safety and that of others on the road. Remember, timely action is essential; neglecting these symptoms can lead to more significant issues down the line.

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