Mercedes W177 Fuel Filler Cap Fuel Tank Cover Diesel A0004706400

The Mercedes W177 Diesel Fuel Filler Cap is an original part of the refueling system, designed specifically for compact models of this generation. Thanks to its precise fit and construction compliant with manufacturer standards, it ensures secure sealing of the fuel tank and stable operation of the fuel system in daily use.

Specifications and technical data

• SKU: A0004706400
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A0004706400
• Substitutable numbers: A0004706400, A 000 470 64 00
• Fuel type: Diesel
• Category: Fuel Tank Caps

Purpose and Function in the Fuel System

The presented fuel filler cap is a component from the Fuel Filler Flaps and Caps group, intended for Mercedes compact class W177 vehicles with a diesel engine. Its purpose is to tightly seal the filler neck, which limits diesel fuel evaporation, protects against contamination, and helps maintain proper operating conditions for the fuel system.

The solution dedicated to Diesel fuel minimizes the risk of refueling errors and is adapted to the specifics of modern diesel engines, where stable pressure and fuel cleanliness are crucial for the durability of injectors and pumps.

Construction and Fit for Mercedes W177

The cap has been developed as an original part, which translates to a proper fit with the filler neck in the W177 body. The construction ensures:

• appropriately selected sealing geometry for the filler neck,
• ergonomic shape for easy unscrewing and screwing,
• compatibility with the factory mounting in the fuel filler area.

This allows for predictable installation without the need for modifications or adjustments, and the cap works with the existing flap and hardware around the filler.

Benefits of Using an Original Diesel Cap

Using a dedicated fuel filler cap on the Mercedes W177 offers a range of practical operational benefits:

• Reduced ingress of moisture and dirt into the filler neck, supporting fuel cleanliness before the filter.
• Maintenance of proper pressure conditions in the tank, essential for the operation of the diesel fuel supply system.
• Consistency with the vehicle's factory construction, facilitating future diagnostics and servicing.

This solution is particularly recommended when replacing a damaged, leaky, or incomplete cap, especially when you want to maintain the parameters specified by the vehicle manufacturer.

Condition, Origin, and Practical Application

The offered part comes from the used parts group, allowing for an economical repair of the fuel filler area while maintaining the original manufacturer's specifications. This type of component is often replaced after mechanical damage (e.g., breakage, cracking, seal wear) or when the previous cap no longer provides adequate sealing.

Before installation, it is advisable to verify compatibility with the specific W177 engine and body version, using manufacturer markings or a catalog by OEM number. This will ensure the fuel filler cap operates fully in accordance with the diesel fuel system design of your Mercedes.

Technical Support and Additional Materials

If you want to better understand how the fuel filler cap interacts with other fuel supply system components, it is worth consulting a guide describing the entire fuel path – from the tank to the injectors. A detailed discussion can be found in the article Fuel System – Injectors, Pumps, and Fuel Tank: Maintenance and Repair, which covers, among other things, diagnostic principles and part selection by OEM numbers.

If you are planning a comprehensive repair or upgrade of the fuel filler area in your Mercedes and need other parts from the same group, such as additional caps, flaps, or filler neck covers, check the available parts in the Mercedes Fuel Filler Flaps and Caps category.

When considering a broader replacement of components in your car, it is also worth familiarizing yourself with the guide on selecting original used parts, available in the article Used Mercedes Parts – Original Components from Dismantling, which discusses the advantages of using factory parts at a reasonable price.