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
Still not sure about your car's issue?
Diagnose your car
What kind of issue are you experiencing?
Brakes are squeaking
Car is not starting
Car is overheating
Car is shaking (vibrating)
Fluids are leaking
Heating and A/C
Smoke or steam is coming out of the car
Warning light is on
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

More related articles

How to Get a Louisiana Driver's Permit
s licensing program. The first step in this program is to obtain...
Veteran and Military Driver Laws and Benefits in Idaho
The state of Idaho offers a number of benefits and perks for those Americans who have either served in an Armed Forces branch in the...
Veteran and Military Driver Laws and Benefits in New Mexico
The state of New Mexico offers a number of benefits and perks for those Americans who have either served in an Armed Forces branch...


Related questions

Q: My 2001 ML 430 Mercedes Benz ran out of gas I put gas and now it does not want to start

Hi there. What happened is the fuel system got air in it causing a vapor lock on the injectors and the pump will not pick up the fuel due to the air bubble in the fuel system. First, make sure...

Q: What do I do if the Check Fuel Cap message appears?

Your car is equipped with a pretty sophisticated evap/emissions system that monitors the level of pressure in the gas tank. This is done to detect possible leaks, including a loose gas cap. If you’ve left the cap loose (or off),...

Q: My car is leaking from the bottom rear area from what I believe could be the gas tank or the evaporation 2011 Hyundai Sonata

Hi there - yes, the evaporative emissions cannister is located at the rear, above the fuel tank, and could be leaking. The tank filler tube, and fuel pump (or lines) could also be leaking. Any of these could allow fuel...