INFINITI FX35 Smells Like Gas

Common Causes of Fuel Odors in Your INFINITI FX35 and Essential Safety Precautions

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Reviewed by
Devin Cabugcal
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 INFINITI FX35 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 INFINITI FX35 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 Issues in an INFINITI FX35

When faced with a gas smell in your INFINITI FX35, it's essential to adopt a methodical diagnostic approach to ensure safety and effectiveness. Start by determining the source of the odor; confirm that there are no fuel leaks, as this is the most critical step. If no leaks are detected, proceed to inspect the fuel and emission systems, as these components can emit fumes or liquid fuel that contribute to the smell. Next, examine the ignition cylinder for any irregularities, as issues here can lead to erratic engine performance, exacerbating the gas smell. Additionally, check the oxygen sensor, as a malfunctioning sensor can cause engine misfires and poor fuel combustion, particularly during acceleration or low-speed driving. If the gas smell is noticeable inside the cabin, inspect the fresh air duct and cabin filter, as well as the battery area, since leaks from these components can also lead to unpleasant odors. By following this structured approach, you can effectively diagnose and address the gas smell issue, ensuring a safer and more enjoyable driving experience in your INFINITI FX35.

What Could Cause a Gas Smell in an INFINITI FX35?

When you detect a gas smell in your INFINITI FX35, it’s crucial to investigate the underlying causes to ensure your safety and the vehicle's performance. One common issue could be the deterioration of seals and o-rings in the modern fuel system, which can lead to fuel leaks. Additionally, inspecting rubber hoses connected to the fuel pump and tank is essential, as these can develop cracks or wear over time, allowing gasoline vapors to escape. If the odor is more pronounced inside the cabin, it may indicate a problem with the fuel sending unit's seal or even residual gas on interior surfaces. Furthermore, a malfunctioning catalytic converter can also contribute to unusual smells, so it’s worth checking for any signs of damage. Lastly, be aware that a leaking battery can emit a sulfuric odor that might be mistaken for gasoline, so a thorough inspection of all components is advisable. Addressing these issues promptly not only enhances your vehicle's safety but also prevents more significant problems down the line.

Why is There a Gas Smell in My INFINITI FX35?

Experiencing a gas smell in your INFINITI FX35 is not just an inconvenience; it can signal serious underlying issues that require immediate attention. Ignoring this symptom could lead to hazardous situations, such as fuel leaks that pose fire risks or emissions failures that could result in costly repairs. Common culprits include a faulty gas cap, which can allow fuel vapors to escape, or issues within the fuel system and emissions control components. Additionally, a failing catalytic converter may not only trigger your check engine light but also lead to poor vehicle performance and increased emissions. For older models, hardening fuel lines can contribute to gas odors, while leaks may also occur near the gas tank or through the cabin's fresh air duct, especially if there’s battery leakage. To ensure your safety and the longevity of your vehicle, it’s crucial to investigate these potential sources promptly. If you’re comfortable with DIY repairs, start by inspecting the gas cap and checking for visible leaks under the vehicle. However, if the smell persists or you identify any significant issues, consulting a professional mechanic is highly recommended to prevent further damage and ensure your vehicle operates safely.

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