Mitsubishi Lancer Smells Like Gas

Common Causes of Fuel Odors in Your Mitsubishi Lancer and Essential Safety Precautions

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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
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40% chance it's the
Emissions Control System
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45% chance it's
Something else
The most common reasons a Mitsubishi Lancer 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 Mitsubishi Lancer 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 in a Mitsubishi Lancer

When faced with a gas smell in your Mitsubishi Lancer, begin your troubleshooting by checking the gas cap. A loose or damaged cap is often the simplest culprit and can easily be rectified by ensuring it is tightly sealed. If the gas cap appears to be in good condition, the next step is to inspect the fuel system for any visible leaks or signs of wear. Look for wet spots or stains around fuel lines and connections, as these can indicate a leak that may be releasing fumes. Additionally, pay attention to the emissions control system, as malfunctions here can also lead to gas odors. If you have checked these components and the smell persists, it may be time to consult a professional technician who can conduct a more thorough examination of the fuel and emissions systems. Remember, addressing gas smells promptly is crucial for your safety, as they can indicate potentially hazardous conditions. By following this diagnostic approach, you can effectively identify and resolve the source of the gas smell, ensuring a safer driving experience.

Diagnosing Gas Smell Issues in a Mitsubishi Lancer

When diagnosing gas smell issues in your Mitsubishi Lancer, it's essential to consider several common problems that could be the source of the odor. Start by checking the gas cap, as a loose or damaged cap is often an easy fix that can eliminate the smell. Next, inspect the fuel system for any leaks or damaged components, as these can lead to fuel odors inside the vehicle. Additionally, examine the emissions control system, which can sometimes malfunction and cause noticeable fuel smells. If your vehicle's diagnostic system indicates a trouble code like P0455, this points to a large evaporative emissions leak that should be addressed. Don't overlook the fuel pump; inspect its connections and hoses for any signs of leaks. Lastly, be aware that high temperatures can intensify fuel smells, so it's crucial to resolve any underlying issues promptly. By systematically checking these areas, you can effectively identify and address the source of the gas smell, ensuring a safer driving experience.

What Should You Do If Your Mitsubishi Lancer Smells Like Gas?

If your Mitsubishi Lancer emits a gas smell, it’s crucial to act swiftly, as this could indicate serious safety hazards or potential damage to your vehicle. A gas odor may stem from a loose or damaged gas cap, which can lead to fuel evaporation and increased emissions. Additionally, leaks in the fuel system, such as from the fuel pump or hoses, can pose fire risks and should be inspected immediately. Problems with the emissions control system or exhaust leaks can also contribute to unpleasant odors and may affect vehicle performance. Furthermore, if your car has undergone modifications, these changes could inadvertently lead to fuel smells if not properly installed. Ignoring these symptoms not only compromises your safety but can also result in costly repairs down the line. Therefore, it’s essential to thoroughly check these components and address any issues promptly to maintain a safe and comfortable driving experience.

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Mitsubishi Lancer Smells Like Gas: Causes & Solutions