2011 Mercedes-Benz E550 Smells Like Gas

Diagnosing Fuel Smells in Your 2011 Mercedes-Benz E550: Causes and Solutions for a Safe Drive

Find Repair Location
Reviewed by
Andrew Hajjar
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 2011 Mercedes-Benz E550 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 2011 Mercedes-Benz E550 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 potential causes and diagnostic steps for a gas smell in a 2011 Mercedes-Benz E550?

When faced with a gas smell in your 2011 Mercedes-Benz E550, it's crucial to adopt a systematic diagnostic approach to identify the underlying issue. Begin with a thorough visual inspection of the vehicle, focusing on areas where fuel leaks are most likely to occur, such as around the fuel tank, fuel lines, and injectors. Next, check the fuel cap to ensure it is securely fastened and free from damage, as a faulty cap can allow gas vapors to escape. If these initial checks do not reveal the problem, utilize a diagnostic scanner to look for any error codes that may indicate issues with the fuel system or the evaporative emissions system. Additionally, inspect the exhaust system for any signs of leaks or damage, as these can sometimes produce a gas-like odor. Finally, pay attention to the engine's performance; any signs of misfiring or irregular operation could suggest that unburned fuel is contributing to the smell. By following this structured approach, you can effectively narrow down the potential causes and take appropriate action to resolve the issue.

What could be causing a gas smell in my 2011 Mercedes-Benz E550?

If you're detecting a gas smell in your 2011 Mercedes-Benz E550, it's crucial to understand the common problems that could be at play. One of the primary concerns is a fuel leak, which may stem from a damaged fuel line, a leaking fuel injector, or a compromised fuel tank seal. Additionally, issues with the evaporative emissions system can lead to the release of fuel vapors, contributing to the odor. A faulty or loose fuel cap is another simple yet often overlooked cause, as it can allow vapors to escape from the fuel tank. Furthermore, an exhaust system leak, such as a crack in the exhaust manifold or damage to the catalytic converter, can produce a gas-like smell inside the cabin. Lastly, an engine misfire may result in unburned fuel entering the exhaust system, creating a noticeable gas odor. Addressing these issues promptly is essential for your safety and the vehicle's performance, so consider having a qualified mechanic inspect your car to accurately diagnose and resolve the source of the gas smell.

How urgent is it to address the gas smell in my 2011 Mercedes-Benz E550?

Addressing a gas smell in your 2011 Mercedes-Benz E550 is an urgent matter that should not be overlooked. The presence of gasoline odors inside your vehicle can signal a fuel leak, which poses a significant fire hazard and can lead to dangerous situations if left unaddressed. Moreover, inhaling gasoline fumes can adversely affect your health, leading to symptoms such as headaches, dizziness, and nausea. Ignoring this warning sign not only jeopardizes your safety but can also result in further damage to your vehicle, potentially leading to expensive repairs down the line. Therefore, if you detect a strong gas odor, it is imperative to stop driving immediately and consult a qualified mechanic to diagnose and rectify the issue. Taking swift action is essential to ensure your safety, protect your health, and maintain the integrity of your vehicle.

You’ve got options with RepairPal

Whether you need a more accurate auto repair estimate or help finding a reputable shop in your area, we’ve got you covered.

Causes of Gas Smell in 2011 Mercedes-Benz E550 | RepairPal