INFINITI Q70 Smells Like Gas

Common Causes of Fuel Odors in Your INFINITI Q70 and Essential Safety Measures to Take

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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
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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 INFINITI Q70 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 Q70 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 Q70

When faced with a gas smell in your INFINITI Q70, begin your troubleshooting by inspecting the gas cap, as this is often the simplest and most common culprit. Ensure that the cap is tightly secured and free from cracks or damage, as a faulty gas cap can easily allow vapors to escape. If the gas cap checks out, move on to the exhaust system; look for any visible signs of leaks in the exhaust pipes, muffler, or tailpipe, as these can emit strong odors if compromised. Next, examine the interior components, particularly the door seals and rear doors, to ensure they are intact and not allowing exhaust fumes to enter the cabin. If the smell persists, it may be necessary to investigate the engine area, particularly around the dipstick and front grille, as concentrated gas odors here could indicate a more serious engine issue. Remember, if you detect gasoline inside the vehicle, it is crucial to address the problem immediately to ensure safety and prevent potential hazards. By following this diagnostic approach, you can effectively identify and resolve gas smell issues in your INFINITI Q70.

What Could Cause a Gas Smell in an INFINITI Q70?

When you detect a gas smell in your INFINITI Q70, it’s essential to investigate the underlying causes to ensure your safety and the vehicle's performance. One of the most common culprits is a loose or damaged gas cap, which can allow fuel vapors to escape. Checking the gas cap for proper sealing is a straightforward first step. Additionally, issues within the fuel system, such as leaks in the fuel lines or an overfilled gas tank, can also lead to noticeable gas odors. Inspecting the fuel lines for any signs of wear or damage can help identify potential leaks. Furthermore, problems with the emissions control system, including a malfunctioning catalytic converter, may not only produce a gas smell but could also trigger the check engine light. Lastly, an unpleasant odor from the exhaust could indicate issues with the exhaust system itself. If you’re comfortable with DIY repairs, start by examining these areas, but remember that persistent issues should be addressed by a professional to ensure your vehicle remains safe and reliable.

What to Do When Your INFINITI Q70 Smells Like Gas?

When your INFINITI Q70 emits a gas smell, it is crucial to act swiftly to mitigate safety risks and prevent further damage to your vehicle. The first step is to identify the source of the odor, as a gasoline leak can pose a serious fire hazard. Begin by inspecting the engine bay and undercarriage for any visible signs of leaks. Additionally, check the gas cap; a loose or damaged cap can allow gas vapors to escape, leading to a noticeable smell. If the cap is secure but the odor persists, it may be time to inspect the fuel system for leaks, which should ideally be done by a professional mechanic. Furthermore, if the exhaust emits a gas-like smell, this could indicate an imbalance in the air-fuel mixture, necessitating an engine tune-up. It’s also wise to monitor the brake system, as a gas smell during braking could signal issues that require immediate attention. Remember, if the odor is strong, allow your vehicle to cool down and avoid driving until the problem is resolved. Addressing these symptoms promptly not only ensures your safety but also protects the integrity of your INFINITI Q70.

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INFINITI Q70 Smells Like Gas? Common Causes & Solutions