2021 Honda Clarity Smells Like Gas

Common Causes of Fuel Odors in Your 2021 Honda Clarity and How to Address Them Safely

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Reviewed by
Aisha
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 2021 Honda Clarity 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 2021 Honda Clarity 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 for a gas smell in a 2021 Honda Clarity, and how should I diagnose the issue?

When faced with a gas smell in your 2021 Honda Clarity, it's essential to adopt a systematic diagnostic approach. Start by visually inspecting the area beneath your vehicle and around the fuel tank for any signs of a fuel leak, as this is often the most straightforward issue to identify. Next, examine the fuel injectors for any leaks or signs of malfunction, as a faulty injector can contribute to the smell. Additionally, check the evaporative emissions system, which is designed to contain fuel vapors; any leaks here can lead to noticeable gas odors. Don’t overlook the exhaust system, as a leak can allow exhaust fumes to enter the cabin, mimicking a gas smell. Lastly, ensure that you are not overfilling the gas tank during refueling, as this can cause fuel to spill and create an odor. If these initial checks do not reveal the source of the problem, consider using a gas leak detector for a more precise diagnosis or consult a qualified mechanic for a thorough inspection. By following this methodical approach, you can effectively narrow down the potential causes of the gas smell and take appropriate action to resolve the issue.

What could be causing my 2021 Honda Clarity to smell like gas?

If your 2021 Honda Clarity is emitting a gas smell, it’s crucial to identify the underlying cause to ensure both safety and vehicle performance. One common issue could be a fuel leak, which may stem from damaged fuel lines, leaking fuel injectors, or a faulty fuel tank cap. Additionally, problems with the evaporative emissions system can lead to fuel vapors escaping, resulting in a noticeable odor. Another potential culprit is a leak in the exhaust system, which can allow gas fumes to infiltrate the cabin. Overfilling the gas tank is also a frequent cause, as it can lead to gasoline spilling and creating a strong smell. Lastly, faulty engine components, such as the fuel injectors or fuel pressure regulator, may contribute to the issue. For those inclined to DIY, it’s advisable to conduct a thorough inspection of these areas, but if the problem persists, consulting a qualified mechanic is essential for a proper diagnosis and resolution.

How urgent is it to address the gas smell in my 2021 Honda Clarity?

Addressing a gas smell in your 2021 Honda Clarity is not just a minor inconvenience; it is a critical safety issue that demands immediate attention. Ignoring this warning can lead to severe consequences, including the risk of fire or explosion, particularly if there is a gasoline leak in your fuel system. Additionally, the health risks associated with inhaling gasoline fumes are significant, as they can cause dizziness, headaches, and other serious health problems over time. For those who are inclined to take a DIY approach, it is essential to first ensure your safety by working in a well-ventilated area and wearing protective gear. Begin by visually inspecting the fuel lines and connections for any signs of leaks or damage. If you detect any issues, it is advisable to consult a professional mechanic for a thorough inspection and repair. Remember, while DIY fixes can be rewarding, the potential dangers associated with gasoline leaks make it crucial to act swiftly and decisively.

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