2017 Chevrolet City Express Smells Like Gas

Diagnosing Fuel Odor Issues in Your 2017 Chevrolet City Express and Essential Safety Measures

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Reviewed by
Devin Cabugcal
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 Chevrolet City Express 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 Chevrolet City Express 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 are the potential causes for a gas smell in a 2017 Chevrolet City Express, and how should I diagnose the issue?

When dealing with a gas smell in your 2017 Chevrolet City Express, it's crucial to follow a methodical diagnostic approach to pinpoint the issue accurately. Begin by inspecting the fuel system for any leaks, focusing on the fuel lines, tank, and injectors, as these are common culprits. A simple yet often overlooked step is to check the fuel cap; ensure it is tightly sealed, as a loose or damaged cap can lead to noticeable gas odors. If these checks do not resolve the issue, turn your attention to the fuel filter, as a clogged or faulty filter can also contribute to the smell. Additionally, the evaporative emissions system should be examined, particularly the charcoal canister and purge valve, since malfunctions in this system can allow gas vapors to escape. Finally, inspect the exhaust system for any leaks or damage, as these can sometimes produce a gas-like odor. If you still cannot identify the source of the smell after these assessments, it may be time to consult a qualified mechanic for a comprehensive diagnosis. By systematically addressing these potential issues, you can effectively troubleshoot the gas smell in your vehicle.

What could be causing a gas smell in my 2017 Chevrolet City Express?

If you're detecting a gas smell in your 2017 Chevrolet City Express, it's crucial to identify the underlying issue to ensure both your safety and the vehicle's performance. One common culprit could be a fuel leak, which may stem from a damaged fuel line, a malfunctioning fuel injector, or even a compromised fuel tank. Additionally, problems with the evaporative emissions system, designed to manage fuel vapor release, can also lead to noticeable gas odors. Don't overlook the possibility of a faulty fuel cap; a loose or damaged cap can allow fuel vapors to escape, contributing to the smell. Furthermore, an exhaust system leak or an engine misfire could also be responsible, as these issues can cause unburned fuel to enter the exhaust, resulting in a gas-like scent inside the vehicle. Addressing these problems promptly is essential, and while some DIY enthusiasts may feel confident tackling minor repairs, consulting a professional mechanic is often the best course of action for a thorough diagnosis and resolution.

How urgent is it to address the gas smell in my 2017 Chevrolet City Express?

Addressing a gas smell in your 2017 Chevrolet City Express is an urgent matter that should not be overlooked. The presence of gas fumes poses significant safety risks, including the potential for fire or explosion, which can have devastating consequences. Additionally, inhaling gas vapors can lead to serious health issues, such as dizziness, headaches, and nausea, making it imperative to act quickly. Ignoring this warning sign can also result in further damage to your vehicle's engine or fuel system, leading to expensive repairs down the line. Therefore, it is crucial to have your vehicle inspected by a qualified mechanic at the first sign of a gas smell to identify and rectify the source of the leak, ensuring both your safety and the longevity of your vehicle.

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