2018 Subaru Outback Smells Like Gas

Addressing Gas Smells in Your 2018 Subaru Outback and Safety Measures

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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 2018 Subaru Outback 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.

What could be causing my 2018 Subaru Outback to smell like gas, and how should I diagnose the issue?

When diagnosing a gas smell in your 2018 Subaru Outback, it's crucial to take a methodical approach that prioritizes simpler checks before delving into more complex issues. Begin by inspecting the fuel system for any leaks, focusing on the fuel lines, tank, and injectors, as these are common culprits for gas odors. Next, verify that the fuel cap is tightly secured; a loose or damaged cap can easily allow gas vapors to escape, contributing to the smell. If these initial steps do not resolve the issue, turn your attention to the fuel filter, as a clogged or dirty filter can disrupt fuel flow and lead to unpleasant odors. Additionally, examine the Evaporative Emission Control System (EVAP), which is designed to prevent fuel vapors from escaping; any malfunction in this system could result in a gas smell inside the vehicle. Finally, check the exhaust system for leaks, as exhaust fumes can infiltrate the cabin if there are any breaches. If you still cannot identify the source of the gas smell after these checks, it may be time to consult a qualified mechanic for a comprehensive inspection and accurate diagnosis. By following this structured diagnostic approach, you can effectively pinpoint and address the cause of the gas smell in your Subaru Outback.

What are the common causes of a gas smell in a 2018 Subaru Outback?

When you detect a gas smell in your 2018 Subaru Outback, it’s crucial to investigate the issue promptly, as it can indicate several underlying problems. One of the most frequent culprits is a fuel leak, which may stem from a compromised fuel injector, damaged fuel line, or even a leaking fuel tank. Additionally, a faulty fuel cap can allow gas vapors to escape, leading to a noticeable odor; ensuring that the cap is secure and in good condition is a simple first step. Another area to consider is the evaporative emissions system, which is designed to contain fuel vapors; any malfunction here can result in gas smells both inside and outside the vehicle. Furthermore, an exhaust system leak, particularly near the catalytic converter or muffler, can sometimes mimic a gas odor. Lastly, engine performance issues, such as running too rich, can also contribute to the smell of gasoline. By systematically checking these components, you can identify the source of the gas smell and take appropriate action to resolve the issue, ensuring your vehicle remains safe and functional.

What should I do if my 2018 Subaru Outback smells like gas?

If your 2018 Subaru Outback emits a gas smell, it’s crucial to act swiftly, as neglecting this issue can lead to serious safety hazards, including the risk of fire or engine damage. Start by thoroughly checking for any visible leaks around the fuel lines and connections; even a small leak can escalate into a dangerous situation. Ensure that your fuel cap is tightly secured, as a loose cap can allow fuel vapors to escape into the cabin. If the smell persists, inspect the fuel injectors for any signs of malfunction, as faulty injectors can contribute to gas odors. Additionally, examine the fuel lines for any damage or leaks, as these can be significant sources of gas smells. Don’t overlook the evaporative emissions system, which can also cause gas odors if it’s not functioning properly. If you suspect a serious issue, it’s best to refrain from driving your vehicle until the problem is resolved, as this not only protects your safety but also prevents further damage to your Subaru. Taking these steps can help you address the gas smell effectively and maintain the integrity of your vehicle.

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