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<h2>What is a filler neck on the gas tank?</h2>
A fuel tank filler neck pipe is a component of a vehicle's fuel system that connects the fuel tank to the fuel filler inlet. It is typically located behind the fuel door on the side of the vehicle. The filler neck pipe is a long, narrow metal or plastic tube that extends from the fuel tank to the filler inlet, and it is designed to allow fuel to flow into the tank while also preventing spills and fuel vapors from escaping.
The fuel tank filler neck&nbsp;has several important functions. Firstly, it prevents fuel spills and splashes by directing the fuel flow directly into the tank, which can help prevent fuel from spilling onto the ground and help decrease environmental pollution.
The components of a fuel gas tank filler neck can also help ensure safe and efficient fueling. The fuel filler neck pipe generally consists of a filler neck, a vent tube, a flange or collar, a locking cap and a sensor.
<h2>Bad fuel filler neck symptoms</h2>
The fuel tank filler neck pipe may become damaged or corroded over time, which can lead to leaks or other problems. A bad fuel tank filler neck can cause several issues with the fuel system of a vehicle. Therefore, learning how to look for the failing signs of a fuel tank filler neck is important:
<ul>
<li>Fuel smell: A bad fuel tank filler neck can cause a noticeable fuel smell, especially if the neck is leaking or cracked. Fuel vapors can escape from the filler neck, causing a strong odor. If you smell gasoline near the fuel tank or filler neck, it may be a sign of a bad filler neck.</li>
<li>Fuel leaks: Leaking fuel is a clear indication that the fuel tank filler neck needs to be inspected or repaired. Fuel leaks can occur from a cracked or corroded filler neck or a loose or damaged hose or clamp. Look for any signs of fuel dripping or pooling under the vehicle, as this can pose a significant safety risk.</li>
<li>Difficulty filling the tank: If you're having trouble filling the fuel tank or it takes a long time to fill, it may be due to a blocked or damaged filler neck. A blocked vent tube or a damaged filler neck can restrict fuel flow, causing difficulty in filling the tank.</li>
<li>Check engine light: A bad fuel tank filler neck can cause the check engine light to come on, especially if there is an issue with the fuel system or emissions control system. A diagnostic scan tool can help identify any trouble codes associated with a bad filler neck.</li>
<li>Visual inspection: A visual inspection of the fuel tank filler neck can reveal any visible signs of damage, such as cracks, rust, or corrosion. Look for any signs of wear or damage, including broken mounting brackets or damaged hoses.</li>
</ul>
<h2>Fuel tank filler neck replacement</h2>
If any of the above signs are noticed, you are suggested to have the fuel tank filler neck inspected by a qualified mechanic as soon as possible. If you have identified a bad fuel tank filler neck that needs to be replaced, you may be interested in the steps involved in a fuel tank filler neck replacement.
First of all, you will need to gather the necessary tools and materials. Then disconnect the battery to locate and disconnect the old filler neck. After that, install the new filler neck and then test the fuel system for leaks and proper operation. Don&rsquo;t forget to reconnect the battery.

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GMC Jimmy Fuel Tank Filler Neck Pipe