2018 Mitsubishi Mirage G4 Smells Like Gas

Identifying the Causes of Gas Smells in Your 2018 Mitsubishi Mirage G4 and Essential Safety Measures

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Reviewed by
Andrew Hajjar
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 Mitsubishi Mirage G4 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 2018 Mitsubishi Mirage G4 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 steps should I take to diagnose the gas smell in my 2018 Mitsubishi Mirage G4?

To effectively diagnose the gas smell in your 2018 Mitsubishi Mirage G4, start with a thorough visual inspection of the fuel system components. Look for any visible leaks around the fuel tank, fuel lines, and fuel injectors, as these are common culprits for gas odors. Next, ensure that the fuel cap is securely fastened, as a loose or damaged cap can allow fumes to escape. If the smell persists, examine the fuel filter for clogs or damage, as these can also contribute to gas odors. Pay special attention to the fuel injector O-rings; worn or faulty O-rings can lead to leaks. Additionally, inspect the evaporative emissions control system for any signs of malfunction or leaks, as issues here can also produce gas smells. Finally, check the exhaust system for leaks, as these can sometimes mimic the scent of gasoline. If after these checks the source of the smell remains elusive, it may be time to consult a qualified mechanic for a more in-depth diagnosis. By following this systematic approach, you can identify and address the source of the gas smell effectively.

What could be causing my 2018 Mitsubishi Mirage G4 to smell like gas?

If you're experiencing a gas smell in your 2018 Mitsubishi Mirage G4, it's essential to pinpoint the cause to ensure both your safety and the vehicle's performance. A common issue could be a fuel leak, which may arise from damaged fuel lines, injectors, or the fuel tank itself, leading to a strong odor both inside and outside the car. Additionally, a faulty fuel injector can disrupt the proper atomization of fuel, contributing to the gas smell. Another area to investigate is the evaporative emissions system; if components like the charcoal canister or purge valve are malfunctioning, they can release gas vapors into the atmosphere. It's also important to check the gas cap; a loose or damaged cap can easily allow fuel vapors to escape. Lastly, consider the possibility of an exhaust system leak, such as a cracked manifold or a damaged gasket, which can allow gas fumes to enter the cabin. Addressing these issues promptly is crucial, so if you notice a gas smell, it's advisable to consult a qualified mechanic for a comprehensive inspection and resolution.

How urgent is it to address the gas smell in my 2018 Mitsubishi Mirage G4?

When you detect a gas smell in your 2018 Mitsubishi Mirage G4, it is essential to act swiftly. The presence of gas fumes not only indicates a potential leak but also poses serious safety risks, including the threat of fire or explosion, particularly in the confined space of your car. Additionally, inhaling these fumes can lead to immediate health concerns such as dizziness and nausea, and prolonged exposure may result in more severe health issues. Beyond safety and health, neglecting this issue can lead to further damage to your vehicle's fuel system, which could escalate into costly repairs. Therefore, if you notice a gas smell, prioritize addressing it immediately to safeguard your well-being and maintain your vehicle's integrity.

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