1999 Honda Odyssey Smells Like Gas

Common Causes of Fuel Odors in Your 1999 Honda Odyssey and Essential Safety Measures to Take

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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 1999 Honda Odyssey 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 efficiency.
  • 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 1999 Honda Odyssey 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.

How to diagnose a gas smell in a 1999 Honda Odyssey?

When faced with a gas smell in your 1999 Honda Odyssey, begin your diagnostic journey with the simplest and most accessible checks. Start by inspecting the gas cap, as a loose or damaged cap is often the culprit behind fuel odors. Ensure it is securely tightened, and consider replacing it if you notice any wear. Next, examine the fuel system for leaks; this includes checking the fuel lines and connections for any signs of damage or wetness. If the smell persists, turn your attention to the emissions control system, as malfunctions here can also contribute to gas odors. Inspect the fuel filter, located atop the fuel tank, for cracks or leaks, as a compromised filter can emit strong fuel smells. Additionally, assess the evaporative emissions system for any issues, as this system plays a crucial role in managing fuel vapors. By systematically addressing these areas, you can effectively diagnose and resolve the gas smell issue in your vehicle, ensuring a safer and more pleasant driving experience.

What could be causing a gas smell in my 1999 Honda Odyssey?

When you notice a gas smell in your 1999 Honda Odyssey, it's essential to identify the source to ensure your safety and the vehicle's proper functioning. Common issues that may lead to this odor include fuel system leaks, which can occur in fuel lines or injectors, allowing gasoline to escape and create a strong smell. A faulty gas cap is another frequent culprit, as it may not seal correctly, resulting in fuel vapors leaking into the cabin. Additionally, problems with the evaporative emissions system, such as a malfunctioning evap canister vent, can contribute to the gas odor. It's also important to check the fuel filter for any cracks and assess the condition of the evaporative emissions system located on top of the fuel tank, as these can worsen the smell. Lastly, consider the venting system, especially if fuel vapor is entering through vents near the windshield. By addressing these potential issues promptly, you can eliminate the gas smell and ensure the safety and efficiency of your Honda Odyssey.

How urgent is it to address the gas smell in my 1999 Honda Odyssey?

Addressing the gas smell in your 1999 Honda Odyssey is an urgent matter that should not be overlooked. Ignoring the scent of gasoline can lead to serious health risks, including carbon monoxide poisoning, which can occur even in the absence of a visible fire hazard. A gas smell often indicates a gasoline leak, which is not only a safety concern but also a significant fire risk. Fuel is highly flammable, and even a minor spark can ignite a dangerous situation. The source of the odor could stem from various issues, such as overfilling the fuel tank or leaks in the fuel system components, including the tank, filler neck, or the EVAP system. Therefore, it is essential to promptly identify and resolve the source of the gas smell to ensure your safety and prevent potential hazards associated with gasoline fumes. Taking immediate action can help you avoid costly repairs and ensure that your vehicle remains safe to drive.

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