2017 Porsche 718 Cayman Smells Like Gas

Diagnosing Fuel Odor Issues in Your 2017 Porsche 718 Cayman and Essential Safety Measures

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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 2017 Porsche 718 Cayman 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 2017 Porsche 718 Cayman 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.

What could be causing my 2017 Porsche 718 Cayman to smell like gas, and how should I diagnose the issue?

When diagnosing a gas smell in your 2017 Porsche 718 Cayman, it's essential to adopt a systematic approach that prioritizes simpler checks before delving into more complex issues. Start by inspecting the fuel cap to ensure it is tightly sealed, as a loose or damaged cap can easily allow gas vapors to escape. Next, examine the fuel lines, tank, and injectors for any visible leaks or signs of wear, as these components are critical to the fuel system's integrity. If these initial checks do not reveal the source of the odor, consider the condition of the fuel injectors, as faulty injectors can leak fuel and contribute to the smell. Additionally, the evaporative emissions control system should be assessed, particularly the charcoal canister and purge valve, which can malfunction and lead to gas odors inside the cabin. Finally, if the smell persists, inspect the exhaust system for leaks or damage, as issues here can also produce a gas-like odor. By following this diagnostic approach, you can effectively identify and address the underlying cause of the gas smell, ensuring both your safety and the optimal performance of your vehicle.

What are the common causes of a gas smell in a 2017 Porsche 718 Cayman?

When you detect a gas smell in your 2017 Porsche 718 Cayman, it's crucial to investigate the potential causes to ensure your safety and the vehicle's integrity. One of the most common culprits is a fuel leak, which can stem from damaged fuel lines, faulty fuel injectors, or even a cracked gas tank. Additionally, issues with the evaporative emissions system, designed to manage fuel vapor release, can lead to unpleasant odors inside the cabin. A loose or damaged fuel cap is another simple yet often overlooked cause, allowing fuel vapors to escape. Furthermore, problems within the exhaust system, such as leaks or a malfunctioning catalytic converter, can also contribute to a gas smell. Lastly, engine-related issues, including a rich fuel mixture or faulty sensors, may be responsible for the odor. Addressing these issues promptly is essential not only for your comfort but also for preventing potential hazards associated with fuel leaks and mechanical failures.

How urgent is it to address the gas smell in my 2017 Porsche 718 Cayman?

Addressing a gas smell in your 2017 Porsche 718 Cayman is not just a matter of inconvenience; it is a pressing safety concern that requires immediate attention. Ignoring this issue can lead to severe consequences, including the risk of fire due to gasoline leaks, which can endanger both the vehicle and its occupants. Additionally, inhaling gasoline fumes poses significant health risks, potentially causing symptoms such as dizziness, headaches, and nausea. Furthermore, a persistent gas odor may indicate a leak in the fuel system, which can compromise vehicle performance and lead to costly engine damage if left unresolved. Therefore, it is crucial to act swiftly and investigate the source of the smell to ensure the safety and reliability of your Porsche 718 Cayman.

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2017 Porsche 718 Cayman Gas Smell Issues & Repairs