Mercedes-Benz A W168 Petrol Diesel Fuel Tank Filler Neck Pipe Hose A1684703520

Mercedes-Benz A W168 Petrol Diesel Fuel Tank Filler Neck Pipe Hose is an original filler neck pipe designed for use with the fuel system in petrol engines. This component is responsible for the safe and leak-proof routing of fuel from the filler cap to the tank, which is crucial for trouble-free operation and convenient refueling. Thanks to its factory geometry and fitment for the A-Class W168 body, the fuel filler neck pipe ensures proper positioning and stable mounting within the chassis.

Specifications and technical data

• SKU: A1684703520
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1684703520
• Substitutable numbers: A1684703520, A 168 470 35 20, BG
• Fuel type: Petrol
• Offset (ET):
• Category: Coolant Hoses

Purpose and technical function

The offered fuel filler neck pipe is a fuel system component designed for Mercedes A W168 series vehicles powered by petrol fuel. Its function is to:

• route the fuel flow from the filler neck to the tank,
• maintain system integrity during refueling and operation,
• provide a stable connection to the body and fuel tank,
• reduce the risk of leaks and unwanted fuel vapors.

Due to its design tailored to the A-Class W168 architecture, the pipe maintains the correct bending radius and routing relative to chassis components, which minimizes stress and positively impacts the durability of the entire system.

Construction and fitment for Mercedes A W168

The fuel filler neck pipe in this model connects the external filler part with the upper section of the tank, working in conjunction with the body's mounting and sealing elements. Factory fitment for the Mercedes A W168 means compatibility with original mounting points, pipe diameters, and routing geometry.

This solution allows for:

• installation without structural modifications,
• maintaining the correct position relative to the wheel arch and floor,
• proper interaction with the tank ventilation system,
• maintaining factory safety parameters in the fuel supply zone.

Application in service practice

Replacing the fuel filler neck pipe is recommended if leaks, cracks, corrosion of metal parts, or refueling problems (e.g., nozzle clicking off, leaks at the filler) are detected. Using an original pipe dedicated to the A-Class W168 allows for restoring the proper operation of the fuel system without the need for universal solutions.

This component is particularly important in vehicles operated in harsh conditions (moisture, road salt, frequent short trips), where the fuel system is exposed to accelerated wear. Selecting the correct filler pipe reduces the risk of fuel leaks, unpleasant odors, and problems during technical inspections.

Condition and benefits of using a used part

The offered fuel filler neck pipe is a used part, sourced from vehicle dismantling. This type of original component retains its factory geometry and compatibility with the body, which facilitates installation and reduces service time. For many Mercedes A W168 users, this is an economical service solution that allows maintaining the vehicle's original specifications at reasonable repair costs.

Connection to the cooling system and service knowledge

Although the fuel filler neck pipe belongs to the fuel supply zone, service work in its vicinity often involves handling other engine compartment components, including cooling system elements. To better understand the relationship between engine operating temperature and component durability, it is worth consulting specialized technical materials, such as the guide on the engine cooling system, overheating, and the use of used radiators.

Other pipes and hoses for Mercedes

If you are planning a comprehensive repair or upgrade of the engine area in your Mercedes and need other elements from the same group, such as return lines, flexible connection hoses, or sections connecting to the radiator, check the available parts in the Mercedes cooling system pipes and hoses category.