2014 Mercedes-Benz SLK350 Smells Like Gas

Addressing Gas Smells in Your 2014 Mercedes-Benz SLK350 for Safety.

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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 2014 Mercedes-Benz SLK350 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 2014 Mercedes-Benz SLK350 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.

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 steps should I take to diagnose the gas smell in my 2014 Mercedes-Benz SLK350?

To effectively diagnose the gas smell in your 2014 Mercedes-Benz SLK350, start with a thorough visual inspection of the vehicle. Begin by checking for any visible leaks beneath the car, as this can provide immediate clues about potential fuel system issues. Next, ensure that the fuel cap is securely fastened, as a loose or damaged cap can often be the culprit behind gas odors. Proceed to examine the fuel lines and connections for signs of wear or leaks, as these components are critical in maintaining a sealed fuel system. Pay special attention to the fuel injector O-rings, as deterioration in these seals can lead to gas escaping. Additionally, inspect the fuel tank for any damage or leaks that could be contributing to the smell. It’s also wise to look at the exhaust system, as leaks here can sometimes mimic fuel odors. Lastly, don’t overlook the evaporative emissions control system, which can also be a source of gas smells if malfunctioning. If these steps do not reveal the source of the odor, or if you suspect a more serious issue, consulting a qualified mechanic is advisable for a comprehensive diagnosis. By following this diagnostic approach, you can systematically identify and address the source of the gas smell in your vehicle.

What could be causing the gas smell in my 2014 Mercedes-Benz SLK350?

If you're detecting a gas smell in your 2014 Mercedes-Benz SLK350, 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 originate from damaged fuel lines, a compromised fuel tank, or malfunctioning fuel injectors. Inspecting these components for any signs of wear or damage can be a good starting point. Additionally, a faulty fuel injector can lead to improper combustion, contributing to the gas odor. Another area to consider is the evaporative emissions system, which manages fuel vapor release; any issues here can also result in noticeable gas smells. Furthermore, check for leaks in the exhaust system, as these can sometimes mimic a gas-like odor inside the cabin. Lastly, if you've recently overfilled your gas tank, this could lead to fuel spillage and a lingering smell. Addressing these issues promptly is essential for both safety and vehicle performance, so if you're unsure, consulting a qualified mechanic is advisable.

How urgent is it to address the gas smell in my 2014 Mercedes-Benz SLK350?

Addressing a gas smell in your 2014 Mercedes-Benz SLK350 is not just a matter of convenience; it is a critical safety concern that requires immediate attention. Gas leaks pose a significant risk of fire or explosion, making it essential to act quickly to mitigate these dangers. Additionally, inhaling gas fumes can lead to serious health issues, including dizziness, headaches, and nausea, which can impair your ability to drive safely. Beyond the immediate health and safety risks, neglecting a gas smell can result in further damage to your vehicle, leading to more extensive and costly repairs down the line. Therefore, if you detect a gas odor, it is imperative to investigate the source and address the issue without delay to protect yourself, your passengers, and your vehicle.

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2014 Mercedes-Benz SLK350 Gas Smell Issues & Solutions