Mercedes-Benz GLE550e Smells Like Gas

Common Causes of Fuel Odors in Your Mercedes-Benz GLE550e and Essential Safety Measures to Take

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Reviewed by
Aisha
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 GLE550e 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 GLE550e 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.

Troubleshooting Gas Smell in a Mercedes-Benz GLE550e

When troubleshooting a gas smell in your Mercedes-Benz GLE550e, start by conducting a visual inspection of the fuel system components, including fuel lines, injectors, and the fuel tank for any signs of leaks or damage. Pay close attention to areas where fuel may evaporate quickly, as this can make leaks less visible. Next, check the exhaust system for any signs of wear or leaks, as these can also contribute to gas odors in the cabin. If you have access to a diagnostic scanner, use it to check for any error codes related to the fuel system or exhaust, which can provide valuable insights into underlying issues. If the source of the smell remains elusive, consider running the vehicle in a well-ventilated area while monitoring for any changes in odor intensity, as this can help pinpoint the problem. Remember, while DIY diagnostics can be effective, do not hesitate to consult a professional mechanic if you suspect a serious issue, as safety should always be your top priority.

What Could Cause a Gas Smell in a Mercedes-Benz GLE550e?

When you detect a gas smell in your Mercedes-Benz GLE550e, it’s crucial to investigate the underlying causes to ensure your safety and the vehicle's performance. One of the most common culprits is a faulty gas cap, which can allow fuel vapors to escape, leading to noticeable odors both inside and outside the car. Additionally, issues within the fuel system, such as leaks or vapor escapes, can significantly contribute to the gas smell. It's also important to consider the emissions control system; malfunctions here can result in gas odors permeating the cabin. Fuel leaks, whether from damaged lines or connections, are another serious concern that should be addressed immediately. Furthermore, exhaust system problems can sometimes create a gas-like smell, indicating a potential issue that needs attention. Lastly, inspect the seals on the sender, pump units, or pressure sensor, as degraded seals can also lead to fuel odors. If you encounter a gas smell, it’s advisable to conduct a thorough inspection or consult a qualified mechanic to diagnose and resolve the issue effectively, ensuring your vehicle remains safe and reliable.

What Should You Do If Your Mercedes-Benz GLE550e Smells Like Gas?

If you notice a gas smell in your Mercedes-Benz GLE550e, it’s essential to act quickly, as neglecting this issue can lead to serious safety risks and potential damage to your vehicle. Start by checking the gas cap; a loose or damaged cap can easily allow fuel vapors to escape, creating an unpleasant odor. If the cap is secure, turn your attention to the fuel system itself. Look for any visible leaks or signs of wear, as these can be common culprits behind gas smells. Additionally, the emissions control system should be examined, as malfunctions here can also contribute to the issue. If your inspection does not reveal the source of the smell, or if the problem persists, it’s wise to consult a professional mechanic. They can provide a thorough diagnosis to ensure that any underlying issues are addressed promptly. Remember, addressing a gas smell is not just about comfort; it’s a critical safety measure that can prevent more significant problems down the line.

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Mercedes-Benz GLE550e Gas Smell Causes & Solutions