2017 BMW 330i GT XDrive Smells Like Gas

Addressing Gas Smells in 2017 BMW 330i GT xDrive for Safety

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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
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40% chance it's the
Emissions Control System
0%
45% chance it's
Something else
The most common reasons a 2017 BMW 330i GT xDrive 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 BMW 330i GT xDrive 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 initial diagnostic steps should be taken for a 2017 BMW 330i GT xDrive that smells like gas?

When addressing a gas smell in your 2017 BMW 330i GT xDrive, it's crucial to adopt a systematic diagnostic approach. Start by visually inspecting the area around your vehicle for any obvious signs of fuel leaks, such as puddles or wet spots, which can help you quickly identify the source of the odor. Next, examine the fuel lines beneath the car for any signs of wear or damage, as compromised lines can lead to fuel escaping and creating a noticeable smell. Don’t overlook the fuel tank itself; check for any leaks or dents that could indicate a problem. Additionally, inspect the fuel injectors, as faulty injectors can also contribute to gas odors. Another important component to consider is the evaporative emissions control system, which can sometimes malfunction and cause fuel vapors to escape. If these initial checks do not reveal the issue, or if you feel uncomfortable performing these inspections, it’s wise to consult a professional mechanic who can provide a thorough evaluation and accurate diagnosis. By following this structured approach, you can effectively narrow down the potential causes of the gas smell and take appropriate action to resolve the issue.

What could be causing a gas smell in my 2017 BMW 330i GT xDrive?

If you're detecting a gas smell in your 2017 BMW 330i GT xDrive, it's crucial to understand the common problems that could be at play. One of the primary concerns is a fuel leak, which can stem from various components such as fuel injectors, fuel lines, or even the fuel tank itself. This situation is not only alarming but also poses a significant safety risk, necessitating immediate attention. Another potential culprit could be a faulty fuel cap; if it's loose or damaged, it can allow fuel vapors to escape, leading to that unmistakable gas odor. Additionally, issues with the evaporative emissions system, which manages fuel vapor release, may also be responsible. Components like the charcoal canister or purge valve might require inspection to ensure they are functioning correctly. Furthermore, a leak in the exhaust system, such as a cracked manifold or a damaged catalytic converter, can produce a gas-like smell inside the cabin, which is not only unpleasant but can also be hazardous to your health. Lastly, if your engine is running rich, it may be burning excessive fuel, resulting in unburned fuel entering the exhaust system and creating a gas smell. Addressing these issues promptly is essential for both safety and vehicle performance, so if you notice a gas smell, consider conducting a thorough inspection or consulting a qualified mechanic.

How urgent is it to address the gas smell in my 2017 BMW 330i GT xDrive?

Addressing a gas smell in your 2017 BMW 330i GT xDrive is not just a minor 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 those around you. Moreover, inhaling these fumes can lead to serious health issues, including dizziness, headaches, and nausea, making it essential to prioritize your well-being. Additionally, neglecting this issue could escalate into more severe mechanical problems, resulting in costly repairs down the line. Therefore, if you detect a gas smell, it is crucial to act swiftly by consulting a professional to diagnose and resolve the issue, ensuring your vehicle remains safe and reliable.

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2017 BMW 330i GT xDrive: Why It Smells Like Gas | RepairPal