INFINITI M56 Smells Like Gas

Common Causes of Fuel Odors in Your INFINITI M56 and Essential Steps to Address the Issue

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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 INFINITI M56 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 M56 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 an INFINITI M56

When faced with a gas smell in your INFINITI M56, it's crucial to adopt a methodical diagnostic approach to identify and resolve the issue safely. Start by inspecting the gas cap, as a faulty or loose cap is often the simplest and most common cause of fuel odors. If the cap appears secure, move on to examining the rubber hoses under the hood, particularly those connected to the fuel pump and tank, for any signs of wear or leaks. Pay close attention to the intake manifold gasket, as issues here can lead to significant performance problems and fuel leaks. If you detect a gasoline smell inside the vehicle, check for leaks around the fuel sending unit and ensure that no fuel has spilled onto interior surfaces. Remember, addressing these issues promptly is vital not only for your vehicle's performance but also for your safety, as fuel leaks pose serious fire hazards and health risks from exhaust fumes. By following this structured approach, you can effectively troubleshoot and mitigate gas smell concerns in your INFINITI M56.

What to Do When Your INFINITI M56 Smells Like Gas?

When your INFINITI M56 emits a gas smell, it’s crucial to identify the underlying problems to ensure safety and vehicle performance. One of the most common culprits is a faulty gas cap, which can allow fuel vapors to escape if not sealed properly. Inspecting the gas cap for cracks or wear and ensuring it is tightly secured after refueling can often resolve the issue. Additionally, fuel system leaks are a significant concern; check the rubber hoses connected to the fuel pump and tank for any signs of leakage, as even small cracks can lead to noticeable odors. If the smell is particularly strong during start-up or shut down, it may indicate a failing gasket that requires replacement. While these DIY checks can often pinpoint the problem, persistent gas smells warrant a visit to a mechanic for a thorough inspection, as they can diagnose more complex issues that may not be immediately visible. By addressing these common problems, you can maintain a safe and enjoyable driving experience in your INFINITI M56.

Why is There a Gas Smell in an INFINITI M56?

Experiencing a gas smell in your INFINITI M56 is not just an inconvenience; it can signal serious underlying issues that require immediate attention. A leaking gas tank or fuel lines that have become brittle can lead to fuel escaping, creating a hazardous environment that increases the risk of fire or explosion. Additionally, a faulty gas cap can allow fumes to escape, while overfilling the gas tank can cause fuel to spill into the EVAP system, exacerbating the problem. Ignoring these symptoms can lead to costly repairs and safety hazards, making it crucial to investigate and resolve the source of the gas odor as soon as possible. Taking prompt action not only ensures your safety but also protects the integrity of your vehicle.

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INFINITI M56 Gas Smell Causes & Repair Tips | RepairPal