2018 Genesis G90 Smells Like Gas

Diagnosing Fuel Odor Issues in Your 2018 Genesis G90 and Essential Safety Precautions

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Reviewed by
Bo Fader
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 2018 Genesis G90 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 2018 Genesis G90 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.

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 are the potential causes and diagnostic steps for a gas smell in a 2018 Genesis G90?

When dealing with a gas smell in your 2018 Genesis G90, it's essential to adopt a systematic diagnostic approach to identify the root cause effectively. Start by visually inspecting the vehicle for any obvious signs of fuel leaks, such as puddles or wet spots around the fuel lines and tank. 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 issue, examine the exhaust system for any leaks or damage that could contribute to the odor. Utilizing a diagnostic scanner can also be beneficial; it allows you to check for error codes that may indicate problems with the fuel system or emissions components. If the source of the gas smell remains elusive after these steps, it is wise to consult a qualified mechanic for a thorough inspection. By following this structured approach, you can efficiently diagnose and address the gas smell issue in your vehicle.

What could be causing a gas smell in my 2018 Genesis G90?

If you're detecting a gas smell in your 2018 Genesis G90, it's crucial to investigate the underlying causes to ensure both your safety and the vehicle's performance. One of the most common culprits is a fuel leak, which can stem from damaged fuel lines, faulty injectors, or issues with the fuel tank itself. If you suspect a leak, visually inspect the fuel lines for any signs of wear or damage, and consider using a fuel dye to help identify the source. Another frequent issue is a loose gas cap; simply check that it is securely tightened after refueling, as an improperly sealed cap can allow fuel vapors to escape. Additionally, problems with the evaporative emissions system, which captures and recirculates fuel vapors, may lead to a gas odor. Inspect components like the charcoal canister and purge valve for any signs of malfunction. An exhaust system leak can also produce a gas-like smell, so listen for unusual noises and check for cracks in the exhaust manifold or damage to the catalytic converter. Lastly, if you've recently refueled, spilled fuel can linger in the vehicle, so ensure any spills are cleaned up promptly. By addressing these common issues, you can effectively troubleshoot the gas smell in your Genesis G90 and maintain a safe driving environment.

How urgent is it to address the gas smell in my 2018 Genesis G90?

Addressing a gas smell in your 2018 Genesis G90 is not just a matter of inconvenience; it is a pressing safety concern that demands immediate action. Gas leaks pose significant risks, including the potential for fire or explosion, particularly in the confined space of a vehicle. Moreover, inhaling gas fumes can lead to serious health issues, such as dizziness, headaches, and nausea, which can escalate with prolonged exposure. Ignoring this warning sign can also result in further damage to your vehicle, leading to costly repairs down the line. Therefore, it is essential to prioritize this issue and seek professional assistance or conduct a thorough inspection to ensure your safety and the integrity of your vehicle.

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Causes of Gas Smell in 2018 Genesis G90 | RepairPal