2019 Mercedes-Benz GLA250 Smells Like Gas

Common Causes of Gas Smells in Your 2019 Mercedes-Benz GLA250 and Essential Safety Precautions

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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 2019 Mercedes-Benz GLA250 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 2019 Mercedes-Benz GLA250 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.

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 diagnostic steps to take when a 2019 Mercedes-Benz GLA250 smells like gas?

When faced with a gas smell in your 2019 Mercedes-Benz GLA250, it's essential to adopt a systematic diagnostic approach to identify the issue effectively. Start by checking for visible leaks around the vehicle, as any puddles or wet spots can indicate a problem. Next, inspect the fuel cap to ensure it is securely tightened, as a loose or damaged cap can often be the culprit behind gas odors. Moving under the hood, examine the fuel lines and connections for signs of wear or leaks, as these components are critical in maintaining a sealed fuel system. Additionally, consider the condition of the fuel injector, as a malfunctioning injector can contribute to the smell. Don't overlook the fuel tank itself; any damage or leaks here can lead to gas odors permeating the cabin. If these initial checks do not reveal the source of the smell, it may be time to consult a qualified mechanic for a more thorough inspection. By following this structured approach, you can effectively diagnose and address the gas smell issue in your vehicle.

What could be causing the gas smell in my 2019 Mercedes-Benz GLA250?

If you're detecting a gas smell in your 2019 Mercedes-Benz GLA250, 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 various components such as a damaged fuel line, a malfunctioning fuel injector, or even the fuel tank itself. Additionally, a faulty fuel injector can lead to improper fuel combustion, resulting in a noticeable gas odor. Another potential issue could be related to the gas cap; if it's loose, damaged, or missing, it can allow fuel vapors to escape, contributing to the smell. Furthermore, problems with the evaporative emissions control system, designed to manage fuel vapors, can also lead to gas odors if it malfunctions. Lastly, don't overlook the exhaust system; leaks or damage to components like the catalytic converter can sometimes produce a gas-like smell inside the vehicle. Addressing these issues promptly is essential for your safety, so consider consulting a qualified mechanic to accurately diagnose and resolve the source of the gas smell.

How urgent is it to address the gas smell in my 2019 Mercedes-Benz GLA250?

Addressing a gas smell in your 2019 Mercedes-Benz GLA250 is not just a matter of convenience; it is an urgent safety concern that should be prioritized. Gas leaks pose a significant risk of fire or explosion, particularly in the confined space of a vehicle, making immediate action essential. Additionally, inhaling gas fumes can lead to serious health issues, including dizziness and nausea, which can impair your ability to drive safely. Ignoring this warning sign can also result in further damage to your car's components, leading to expensive repairs down the line. Therefore, if you detect a gas smell, it is crucial to seek professional assistance promptly to identify and rectify the source of the problem, ensuring both your safety and the longevity of your vehicle.

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2019 Mercedes-Benz GLA250 Gas Smell Issues & Solutions