Mercedes-Benz C CLK W203 C209 Petrol Fuel Tank Filler Neck Pipe A2034701420

Mercedes-Benz C CLK W203 C209 Petrol Fuel Tank Filler Neck Pipe is an original fuel system component designed for Mercedes C-Class and CLK models of the W203/C209 generation. It ensures safe, leak-proof, and stable fuel delivery from the filler neck to the tank, which is crucial for the proper operation of the entire system. This used OEM component is a sensible choice for repairs where structural fitment and compliance with factory specifications are essential.

Specifications and technical data

• SKU: A2034701420-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2034701420
• Substitutable numbers: A2034701420, A 203 470 14 20, BG
• Fuel type: Petrol
• Category: Fuel Tanks & Filler Necks

Purpose and function in the fuel system

The fuel filler neck pipe in Mercedes C-Class and CLK models is responsible for the controlled flow of petrol from the filler cap area to the tank, minimizing the risk of leaks and fuel aeration. This component operates in direct contact with petrol, so its construction must be resistant to fuel exposure and typical operational stresses, such as temperature fluctuations or body vibrations.

A properly selected fuel filler neck pipe supports:

• maintaining the integrity of the fuel system,
• stable refueling without fuel backflow,
• proper interaction with the fuel tank and venting system.

Compatibility with the petrol fuel system

The presented pipe is designed for vehicles with a petrol engine, meaning its material and construction are matched to the properties of this fuel type. For petrol systems, resistance to fuel evaporation and maintaining proper flow are particularly important to avoid issues during refueling and the operation of the venting system.

Choosing a component compatible with the fuel type reduces the risk of premature wear, cracks, or leaks, which could lead to a smell of fuel in the wheel arch or undercarriage area, and in extreme cases, to improper fuel system operation.

Characteristics of the used OEM component

The fuel filler neck pipe comes from dismantling, which allows it to retain the factory geometry and mounting points specified by the vehicle manufacturer. This facilitates installation in place of the old component without the need for modifications, adjusting brackets, or using additional adapters. A used OEM component also ensures predictable fitment with the bodywork and other fuel system elements.

Choosing an original, used fuel filler neck pipe is often a beneficial solution in situations where aftermarket replacements do not provide proper fitment or have different geometry, which can hinder installation in the limited space of the wheel arch and the tunnel leading to the tank.

Installation and operational tips

When replacing the fuel filler neck pipe in a Mercedes C-Class or CLK, it is worth paying attention to:

• the condition of clamps and mounts – worn mounting elements can cause vibrations and accelerated wear of the pipe,
• leak testing after installation – especially around the connections with the tank and the filler neck,
• inspecting the vent hoses near the pipe – their leakage can cause a smell of fuel.

Professional installation and periodic inspection of the fuel system help maintain safe and stable vehicle operation, as well as reduce the risk of bodywork corrosion in the fuel filler area.

If you are planning a comprehensive repair or upgrade of the fuel system area in your Mercedes and need other components from the same group, such as supply lines, mounting elements, or additional pipe sections, check the available parts in the Mercedes fuel tanks and filler neck pipes category.

Technical support and fuel system selection

To better understand the role of the fuel filler neck pipe in the entire supply system, it is worth reviewing material discussing the construction and diagnostics of the fuel system, including injectors, pumps, and the tank. Practical tips regarding part selection by identification numbers, regeneration, and maintenance can be found in the article "Fuel system – injectors, pumps, and fuel tank: maintenance and regeneration", which may help you make an informed service decision.