Skip the auto shop - Our mechanics make house calls

Symptoms of a Bad or Failing Fuel Filler Neck

fuel filler neck

The fuel filler neck is an important, but often overlooked component of the fuel system. The fuel filler neck is the component that connects the fuel filler port to the fuel tank, and provides a path for the fuel to go into the tank as it is filled. Fuel filler necks are usually made out of metal or rubber, which while durable, can eventually wear out over time. A bad or failing fuel filler neck can cause issues with the emissions of the vehicle, and can even become a safety hazard if the vehicle leaks any fuel. Usually a bad or failing fuel filler neck will produce a few symptoms that can alert the driver of a potential issue.

1. Fuel smell

One of the first symptoms commonly associated with a bad or failing fuel filler neck is a fuel smell. While a faint fuel smell when filling up is normal, if the smell lingers or becomes stronger over time that could be a sign that the fuel filler neck may have a small leak. Aside from a fuel smell, a filler neck that is leaking vapors can also cause issues with the vehicle's EVAP system.

2. Check Engine Light comes on

Another symptom of a possible issue with the fuel filler neck is an illuminated Check Engine Light. If the computer detects any issue with the vehicle’s EVAP system it will set off the Check Engine Light to notify the driver of the issue. The EVAP system is designed to capture and reuse vapors from the fuel tank, and will set off the Check Engine Light if the fuel tank, the neck, or any of the system’s hoses develop any leaks. A Check Engine Light can also be caused by a wide variety of other issues, so having the computer scanned for trouble codes is highly recommended.

3. Fuel leaks

Another symptom of a problem with the fuel filler neck is fuel leaks. If any fuel leaks from the side of the vehicle that contains the filler neck, especially when the vehicle is being filled, then that could be a sign of a potential issue with the vehicle’s filler neck. Most filler necks are made of rubber or metal, which can corrode and wear out over time and leak fuel. Any fuel leaks should be addressed as soon as possible as they could quickly develop into a potential safety hazard.

While filler neck replacement is not necessarily a common maintenance procedure, it is an important job, as the filler neck plays an important role in the vehicle’s fuel system. If your vehicle’s filler neck may be having an issue, have the vehicle inspected by a professional technician, such as one from YourMechanic, to determine if the neck should be replaced.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

Post a question and get free advice from our certified mechanics.

ASK A QUESTION

More related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...


Related questions

Q: Gas not getting to the engine

An easy way to test for a failed fuel pump is to have a certified mechanic, like one from YourMechanic, spray a little bit of starting fluid into the vehicles intake and try to start it again. If this starts...

Q: I'm smelling gas - 1997 Volvo 850

Hi there and thanks for contacting YourMechanic. The best way is to look in your owner's manual and look up the fuel tank size. Then remove the fuel tank from the vehicle to gain access to the fuel filler neck....

Q: Upgrade 4 barrel carburetor - 1989 Jeep Grand Wagoneer

I believe your Wagoneer has a "bimetallic choke coil" choke coil actuator (non-electric), so, you would have to add an electrical source that is "hot" when the ignition key is in the Start or Run position. Some Wagoneer models came...