2013 Mercedes-Benz CLS63 AMG Smells Like Gas

Addressing Gas Smells in Your 2013 Mercedes-Benz CLS63 AMG for Safety.

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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 2013 Mercedes-Benz CLS63 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 2013 Mercedes-Benz CLS63 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.

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 initial steps to diagnose a gas smell in a 2013 Mercedes-Benz CLS63 AMG?

When diagnosing a gas smell in your 2013 Mercedes-Benz CLS63 AMG, start with a thorough visual inspection of the fuel lines, injectors, and vapor hoses for any signs of leaks. It's essential to check for oil spots or puddles under the vehicle, as these can sometimes be confused with a gas odor. Pay attention to any burning smells, which may indicate issues like damaged gaskets or loose components that could lead to oil leaks. Additionally, note when the gas smell occurs; for instance, if it happens when the fuel tank is full or nearly empty, this can help pinpoint the source of the problem. Lastly, inspect the rubber fuel line in the engine compartment, particularly in colder weather, as temperature changes can cause clamps to loosen, potentially leading to leaks. By following these steps, you can effectively narrow down the cause of the gas smell and take appropriate action.

What could be causing a gas smell in a 2013 Mercedes-Benz CLS63 AMG?

If you're detecting a gas smell in your 2013 Mercedes-Benz CLS63 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 that unmistakable odor. Another area to investigate is the evaporative emissions system, which is designed to manage fuel vapors; any malfunction here can contribute to the smell. Furthermore, consider checking the exhaust system for leaks, as issues with components like the catalytic converter or exhaust manifold can inadvertently allow gas odors to infiltrate the cabin. Lastly, engine performance problems, such as running too rich, can also result in a noticeable gas smell. While some of these issues may be manageable for a DIY enthusiast, it's advisable to consult a qualified mechanic for a thorough inspection to ensure safety and proper resolution.

How urgent is it to address the gas smell in my 2013 Mercedes-Benz CLS63 AMG?

Addressing the gas smell in your 2013 Mercedes-Benz CLS63 AMG is not just a matter of comfort; it is a critical safety concern that requires immediate attention. Ignoring this issue can lead to severe consequences, including the risk of fire or engine damage, which can result in costly repairs and jeopardize your safety on the road. A gas smell often indicates a fuel leak or an exhaust problem, both of which can escalate if left unchecked. For instance, a low-pressure fuel hose that is weeping fuel at the connection can lead to a more significant leak, increasing the risk of fire. Therefore, it is essential to investigate the source of the smell as soon as possible. By taking prompt action, you not only protect yourself and your passengers but also ensure the longevity and proper functioning of your vehicle, ultimately saving you from more extensive and expensive repairs in the future.

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Why Your 2013 Mercedes-Benz CLS63 AMG Smells Like Gas