Mercedes W251 Tank Filler Neck Pipe Hose Cap OM642 Diesel A2514702220

Mercedes W251 OM642 Fuel Filler Neck A2514702220 is an original part from the Fuel Tanks and Filler Necks group, designed for diesel engine fuel systems. It ensures a sealed and stable flow of Diesel fuel from the filler opening to the tank, contributing to safe vehicle operation and proper fuel system function.

Specifications and technical data

• SKU: A2514702220-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2514702220
• Substitutable numbers: A2514702220, A 251 470 22 20
• Fuel type: Diesel
• Category: Fuel Tanks & Filler Necks

Purpose and Function in the Fuel System

The fuel filler neck in Mercedes W251 models with the OM642 engine is responsible for the controlled flow of diesel fuel from the filler cap to the tank. A correctly selected component in this section of the fuel system minimizes the risk of leaks, limits the ingress of contaminants, and supports stable tank venting during refueling.

Thanks to its design, adapted to the W251 body geometry, the neck maintains proper rigidity and routing, which is crucial for daily vehicle use, frequent refueling, and operation in varying road conditions.

Benefits of Using an Original Fuel Filler Neck

Using an original fuel filler neck in a Diesel system offers a range of practical operational benefits:

• precise fit to the W251 body and fuel tank,
• maintenance of the original fuel flow geometry,
• reduced risk of leaks in the filler area,
• stable cooperation with other fuel system components.

A component configured in this way supports trouble-free fuel system operation and facilitates diagnostics in case of potential faults, as the original assembly specification is maintained.

Technical and Installation Characteristics

The fuel filler neck is part of a group of components that work in direct contact with diesel fuel, making material resistance to Diesel fuel and temperature changes important. The original design ensures the correct flow diameter, shape, and mounting points, which translates to stable seating in the body and proper connection to the tank.

When replacing, it is recommended to check the condition of seals, clamps, and mountings in the entire filler section, so that the newly installed neck can fully utilize its properties and ensure a sealed, predictable fuel flow path.

Component Condition and Practical Usage Tips

The offered fuel filler neck is a used part. In the case of original Mercedes components, this allows for maintaining the factory fit at a favorable price-to-quality ratio. Before installation, it is advisable to verify compatibility with the specific vehicle equipment version and check the mounting system in the car.

To better understand the role of such components in the entire fuel supply line, a guide describing the diagnostics and operation of the fuel system – injectors, pumps, and tank – will be helpful. A detailed discussion can be found in the article Fuel System – Injectors, Pumps, and Fuel Tank: Maintenance and Repair, which facilitates informed part selection by OEM and VIN numbers.

If you are considering a choice between a used original part and an aftermarket replacement, you can find practical arguments and market examples in the material 5 Reasons Why a Used OEM Part is a Better Choice Than an Aftermarket Replacement, which may help in making a service decision for your Mercedes.

Related Mercedes Fuel System Components

If you are planning a comprehensive repair or upgrade of the fuel system area in your Mercedes and need other parts from the same group, such as filler pipes, spigots, or tank connection elements, check the available parts in the Mercedes Fuel Tanks and Filler Necks category.