Why Does My Honda Accord Smell Like Gas?

It’s alarming when your Honda Accord starts to smell like gas, leaving you worried that there could be a dangerous leak or expensive repairs needed. However, in many cases, the cause is something minor that you can address without huge costs. This guide will overview why a Honda Accord emits a gasoline odor and provide troubleshooting tips to isolate and fix the problem. Read on to determine why your Honda Accord smells like gas and what to do about it.

Why Does My Honda Accord Smell Like Gas?

Several components in the fuel system and engine could cause gas fumes to permeate your Honda Accord’s cabin. Here are some of the most common culprits:

  • Fuel Tank Leaks
  • Loose or Damaged Gas Cap
  • Leaky Fuel Lines
  • Faulty Fuel Injectors
  • Failing PCV Valve
  • Evaporative Emissions System Leaks

Fuel Tank Leaks

One of the first things to check is the Honda Accord’s fuel tank under the rear seat. If it has cracks or punctures, gasoline can seep and create fumes. Fuel tanks are made of sturdy plastic, but damage from debris or accidents can cause leaks.

Loose or Damaged Gas Cap

A loose or damaged gas cap is one of the most likely reasons a Honda Accord smells like gas. The cap creates an air-tight seal to contain fumes, so gas vapors can escape into the air if it is cracked or not tightened properly.

Leaky Fuel Lines

The fuel lines transporting gas from the tank to the engine can also crack or deteriorate over time. Any leaks or damage in the lines will let gasoline fumes permeate the cabin. Fuel lines are made of rubber and susceptible to wear.

Faulty Fuel Injectors

Issues with the fuel injectors that deliver gasoline into the engine can release unburned fuel vapors. Leaking, clogged, or damaged injectors allow gas fumes to escape through the tailpipe and ventilation system.

Failing PCV Valve

The Positive Crankcase Ventilation (PCV) valve circulates blow-by gasses through the intake to be returned. If it fails, combustion gasses containing unburnt fuel can enter the cabin and smell like gas.

Evaporative Emissions System Leaks

All vehicles have an evaporative emissions system that captures fuel vapors before they escape into the air. Problems with components like purge valves or charcoal canisters allow gas fumes to enter the vehicle.

Diagnosing The Source Of The Gas Smell

Once you’ve identified the likely culprits, here are some tips to pinpoint the exact source of the gasoline odour in your Honda Accord:

Inspect Fuel Lines and Tank

Start by visually inspecting the fuel lines along the undercarriage and the plastic fuel tank. Look for any obvious cracks, damage, or leaks. Gasoline will appear as a dark, wet stain if actively leaking.

Check Gas Cap

Remove the gas cap and inspect the gasket seal for brittleness, cracks, or missing sections. Make sure the cap clicks and seals tightly when reattached. Try replacing it with a brand-new OEM gas cap if damaged.

Listen for Hissing near Tank

Open the fuel filler door and listen to the fuel tank when the car is off. Any audible hissing indicates an active leak in the tank which requires immediate attention.

Scan for Trouble Codes

Use an OBD-II scanner to check for diagnostic trouble codes related to the evaporative emissions system. Codes pointing to a faulty purge valve, gas cap, or leaks indicate issues.

Perform Pressure Test

Most mechanics can perform a fuel evap system pressure test to check for leaks. It identifies losses in pressure that signify cracks in hoses, tanks, or components. This confirms the source of vapors.

How To Fix A Honda Accord That Smells Like Gas?

Once the root cause is found, here are tips to stop your Honda Accord from smelling like gasoline:

Replace Gas Cap

If a faulty seal is to blame, replace the gas cap with an OEM part made specifically for your Accord’s model year. Use the ratcheting mechanism until it clicks to ensure it’s properly sealed.

Tighten Fuel Tank Cap

If the gas cap is loose, remove it and tighten it until you hear at least 3 clicking sounds. Wait a few days to see if properly tightening it fixed the gas smell.

Patch or Replace Fuel Lines

Cracked fuel lines allowing vapors to enter the cabin must be replaced. Take your Accord to a mechanic to inspect and replace any damaged sections of rubber fuel lines.

Repair Leaking Fuel Tank

You’ll need a mechanic to mend cracks or punctures in the plastic fuel tank or replace it entirely if severely damaged. Driving with a leaking tank is extremely hazardous.

Clean Fuel Injectors

Dirty injectors can be cleaned using specialist cleaning fluids. However, your mechanic may need to replace the injectors if they are faulty or leaking.

Replace PCV Valve

Your mechanic can easily swap out the PCV valve in less than an hour to stop the flow of fumes if it malfunctions.

Fix Evaporative Emissions System

Any leaks in the evaporative emissions components, like the purge valve, will require repair by a professional mechanic. Proper maintenance keeps this system working efficiently.

Also Read: How Do I Remove The Center Console On Honda Accord?

Frequently Asked Questions 

Why Does My Honda Accord Smell Like Gas When The Car Is Off?

Gas fumes from leaks or components like the fuel tank and lines will be most noticeable when the car is off since ventilation from driving dissipates the smell. When parked, trace the source by listening for any hissing sound near the fuel tank.

Are Gas Smells Always Dangerous In A Honda Accord?

Not necessarily. While leaks are hazardous, sometimes the smell comes from a minor issue like a loose gas cap. Evaluate the intensity of the smell and diagnose accordingly. Faint whiffs when accelerating may indicate a clogged injector.

Can I Drive My Honda Accord If It Smells Strongly Of Gas?

It’s never safe to drive any vehicle with a pronounced gasoline smell in the cabin. This likely signals a real fuel leak, so immediately pull over and call for a tow. Driving with a leak risks fire or explosion.

Does The Gasoline Smell Mean Expensive Repairs For A Honda Accord?

Sometimes yes, but often it’s an easy fix like tightening the gas cap or replacing a hose. Unless there are major tank damage or engine issues, many causes require simple, inexpensive solutions. Proper diagnosis is key.

How Do I Prevent Gas Smells In My Honda Accord?

Regular maintenance like fuel system pressure tests, replacing deteriorating components early, using quality gas caps, fixing minor leaks immediately, and not overfilling the tank will help prevent most gasoline odors in your Accord.


The overwhelming scent of gasoline in your Honda Accord should never be ignored. While it may be a quick fix like tightening the gas cap, it’s crucial to determine if a real leak or engine issue is occurring. Use this comprehensive guide to isolate the root cause and make any needed repairs to stop the odor permanently. Reference the tips to prevent future gas smells and keep your Accord running safely for the long haul.

Author's Image

Ammar Masoud

I have had a long and fulfilling career in the automotive industry, primarily with Honda and Acura. With 15 years of experience as a Honda service technician, I became highly skilled in repair and maintenance, gaining a deep understanding of these vehicles. After many years in the automotive field, I decided to embark on a second career in industrial manufacturing. It was a significant change, but I found that the skills I had honed in the automotive industry were incredibly valuable in my new role. In my current position in industrial manufacturing, the demand for quality workmanship and meticulous attention to detail is paramount. Fortunately, these are traits that I have cultivated throughout my years in the automotive industry. I take pride in applying these skills to meet the high standards expected in the manufacturing sector.