Scion FR-S Smells Like Gas

Common Causes of Fuel Odors in Your Scion FR-S and Essential Steps to Address the Issue

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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 Scion FR-S 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 Scion FR-S 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.

Troubleshooting Gas Smell Issues in a Scion FR-S

When faced with a gas smell in your Scion FR-S, it's essential to adopt a methodical diagnostic approach. Begin by inspecting the gas cap, as a loose or damaged cap is often the simplest and most common culprit. Ensure it is securely tightened after each refueling, as this can significantly mitigate gas odors. If the smell persists, turn your attention to the fuel system. Look for signs of leaks or malfunctions, particularly around the high-pressure fuel pump and fuel lines, as these components can deteriorate over time. Next, examine the emissions control system, including the catalytic converter, which can also contribute to gas smells if failing. Remember, the absence of a check engine light does not rule out potential issues; some problems may not trigger a warning but still require your attention. Lastly, keep in mind that both older and newer vehicles can develop these issues, so regular maintenance and inspections are crucial. By following this step-by-step approach, you can effectively diagnose and address gas smell issues, ensuring your Scion FR-S remains in optimal condition.

What Could Cause a Gas Smell in a Scion FR-S?

If you're experiencing a gas smell in your Scion FR-S, it's crucial to identify the underlying issues to ensure both safety and vehicle performance. Common problems often stem from leaking fuel system components, which can occur due to wear and tear or damage. Pay close attention to seals and O-rings, as these parts can degrade over time, leading to fuel leaks and the accompanying odor. Additionally, a leaking valve cover gasket may contribute to the smell, particularly if it allows fuel vapors to escape into the engine bay. Engine performance issues, such as rough idling or stalling, can also exacerbate the situation, as they may indicate deeper mechanical problems that require attention. Lastly, ensure that all components in the engine bay are properly sealed; any gaps can allow gas vapors to escape, resulting in a noticeable smell. Addressing these issues promptly through regular maintenance and repairs will not only enhance your driving experience but also ensure the safety of you and your passengers.

What to Do If Your Scion FR-S Smells Like Gas?

If you notice a gas smell in your Scion FR-S, it is crucial to act quickly due to the serious safety risks involved. Gasoline fumes are not only toxic but can also lead to dangerous situations, including the risk of fire or carbon monoxide poisoning. Start by ensuring your safety; avoid driving the vehicle and park it in a well-ventilated area away from any potential ignition sources. Next, conduct a thorough inspection of your vehicle to check for visible signs of gas leaks, such as wet spots under the car or a damaged gas cap. Common culprits for a gas smell include a faulty gas cap, leaks in the evaporative emissions system, or overfilling the gas tank. If you cannot identify the source of the smell, it is imperative to seek a professional inspection. Ignoring these symptoms can lead to significant damage to your vehicle and pose serious health risks, so addressing the issue promptly is essential for your safety and the longevity of your Scion FR-S.

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