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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.

Fuel Tank Filler Neck Pipe

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Air Filter Box

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Air Flow Sensor

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Air Intake Duct

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Air Intake Hose

Air Intake Manifold Actuator Control Solenoid

Air Intake Manifold Flap Adjuster

Air Intake Manifold Runner Control Sensor

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Electric Vacuum Pump

Engine Air Duct Assembly

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Engine Air Filter

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Intake Manifold

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Intake Manifold Flap Actuator

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Intercooler

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Oxygen Sensor

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Pressure Sensor

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Throttle Body

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Throttle Position Sensor

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Turbocharger

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Turbocharger Oil Line

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Vacuum Pump

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Camshaft Timing Gear

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Camshafts

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Engine Valve Cover

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Harmonic Balancer

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Timing Belt Kit

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Timing Chain Kit

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Timing Cover

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Timing-Control Valve Solenoid

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Valve Lifters Tappet

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Belt Tensioner

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Crankcase Breather Hose

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Crankcase Breather Valve

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Crankshaft Position Sensor

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Engine Oil Dipstick Tube

Engine Oil Filter

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Flywheel

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Oil Cooler

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Oil Cooler Line

Oil Filler Cap

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Oil Filter

Oil Filter Base

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Oil Filter Housing

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Oil Level Sensor

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Oil Pan

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Oil Pump

Oil Pump Drive Gear Shaft

Oil Pump Pickup Tube

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Cranks, Pistons, Oil & Components

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Camshaft Position Sensor

Camshaft Position Sensor & Magnet Kit

Connector Plug

Distributor Cap

Engine Valve Covers & Ignition Coils Kits

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Ignition Coil

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Ignition Coils & Spark Plugs Kits

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Ignition Distributor

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Ignition Starter Switch

Ignition Switch Actuator

Knock Detonation Sensor

Relay

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Spark Plug

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Spark Plug Wire

Electronic Control Modules, Ignition & Distributors

Engine Wiring Harness

Intake Manifold Repair Kit

Engine Components & Accessories

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Auxiliary Water Pump

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Expansion Tank

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Expansion Tank Mounting Plate

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Fuel Cooler

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Radiator

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Radiator Hose

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Radiator Support Assembly

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Temperature Sensor

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Turbo Hose

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Water Coolant Pipe

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Water Outlet

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Engine Cooling

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Engine Mount

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EGR Valve

Emissions Fluid Pump

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Exhaust Fluid Heater

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Exhaust Gas Temperature Sensor

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Exhaust Manifold

Fuel Tank Breather Valve

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Fuel Vapor Leak Detection Pump

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Nitrogen Oxide Sensor

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Secondary Air Injection Check Valve

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Vapor Canister Vent Solenoid

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Exhaust & Emission Systems

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Fuel Filter

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Fuel Injection Control Module

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Fuel Injection Pressure Regulator

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Fuel Injector

Fuel Injector Kit

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Fuel Injector Module Wiring Harness

Fuel Line Kit

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Fuel Pump

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Fuel Sending Unit

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Fuel Tank Strap

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High Pressure Fuel Pump

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Idle Air Control Valve

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Fuel Systems & Components

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The engine comprises many essential elements such as the lower cylinder block, upper cylinder head(s), and the cooling & lubricating systems. With A-Premium aftermarket engine components, you can expect that your engine deliver years of reliable performance. We offer a diverse selection of engine components from air filters and ignition coils (kits) to fuel pumps to cater to your needs.

GMC sierra%202500%20hd Fuel Tank Filler Neck Pipe