2018 Porsche 718 Boxster Smells Like Gas

Addressing Gas Smells in Your 2018 Porsche 718 Boxster and Safety Measures

Find Repair Location
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 Porsche 718 Boxster 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 Porsche 718 Boxster 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 steps should I take to diagnose the gas smell in my 2018 Porsche 718 Boxster?

To effectively diagnose the gas smell in your 2018 Porsche 718 Boxster, start with a thorough visual inspection of the vehicle. Begin by checking for any visible leaks beneath the car, as this can often be the most straightforward indicator of a problem. Pay close attention to the area around the fuel tank and fuel lines for any signs of dripping fuel or wet spots. Next, ensure that the fuel cap is securely fastened; a loose or damaged cap can easily allow gas odors to escape into the cabin. After that, inspect the fuel lines for any cracks or damage, as these can also contribute to gas smells. If the issue persists, examine the fuel injectors, as faulty injectors may emit gas odors. Additionally, check the fuel tank for any signs of leaks or damage. If you are unable to pinpoint the source of the smell after these checks, it is wise to consult a qualified mechanic who can conduct a more comprehensive inspection. By following this diagnostic approach, you can systematically identify and address the source of the gas smell in your vehicle.

What could be causing the gas smell in my 2018 Porsche 718 Boxster?

If you're detecting a gas smell in your 2018 Porsche 718 Boxster, it's crucial to investigate the underlying causes to ensure both safety and vehicle performance. One of the most common culprits is a fuel leak, which can occur in various components such as the fuel tank, fuel lines, or injectors. A visual inspection of these areas can help identify any visible signs of leakage. Additionally, a malfunctioning fuel injector may not atomize fuel properly, leading to an unpleasant odor. It's also worth checking the evaporative emissions system, as any issues here can allow fuel vapors to escape, contributing to the smell. Clogged air filters can disrupt the air-fuel mixture, potentially causing incomplete combustion and a gas odor. Lastly, inspect the exhaust system for any leaks, as cracks or holes can allow exhaust fumes, including the smell of gasoline, to enter the cabin. Addressing these issues promptly is essential, and while some DIY fixes may be possible, consulting a qualified mechanic for a thorough inspection is often the best course of action.

How urgent is it to address the gas smell in my 2018 Porsche 718 Boxster?

Addressing a gas smell in your 2018 Porsche 718 Boxster is not just a matter of inconvenience; it is a pressing safety concern that requires immediate attention. The presence of gasoline fumes can indicate a leak, which poses a significant fire hazard that endangers both you and others on the road. Moreover, inhaling these fumes can lead to serious health issues, including dizziness, headaches, and nausea, making it essential to act quickly. Ignoring this warning sign could lead to more severe problems within your vehicle's fuel system, potentially resulting in costly repairs down the line. Therefore, if you detect a gas smell, it is crucial to investigate the source and address it promptly to ensure your safety and the longevity of your Porsche.

You’ve got options with RepairPal

Whether you need a more accurate auto repair estimate or help finding a reputable shop in your area, we’ve got you covered.

2018 Porsche 718 Boxster Gas Smell: Causes & Repairs