Mercedes W168 Fuel Filler Cap Tank Cap Diesel Covering Black A1684700705

Mercedes W168 Fuel Filler Cap Tank Cap Diesel Covering Black is an original component from the Fuel filler flaps and caps category, designed for the diesel fuel system in W168 series models. It ensures a tight seal of the filler neck, stabilizes the operating conditions of the fuel system, and helps maintain the safe operation of your Mercedes vehicle.

Specifications and technical data

• SKU: A1684700705
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1684700705
• Substitutable numbers: A1684700705, A 168 470 07 05, BG
• Location on the vehicle: Front, Left
• Fuel type: Diesel
• Color: Black
• Category: Fuel Tank Caps

Purpose and technical function

The presented cap is a component designed for installation in the front left part of the vehicle, in the diesel fuel filler area. Its task is to maintain the proper tightness of the filler neck, limit diesel fuel evaporation, and protect the tank against external contaminants. As a result, the fuel system maintains stable operating conditions, and the risk of dirt or moisture entering the fuel is significantly reduced.

Design, color, and fitment

The cap is finished in black, allowing for a consistent match with the factory bodywork and exterior elements of the Mercedes W168. The design has been engineered for the specific geometry of the filler socket, which facilitates installation and ensures proper sealing contact. Using an original solution from this group eliminates problems typical of generic replacements, such as improper pressure, loose fit, or leaks during temperature changes.

Compatibility with the Diesel fuel system

The cap is adapted to the specifics of the Diesel fuel system, where limiting the access of air and moisture to the tank is particularly important. A correctly selected fuel filler component supports:

• maintaining proper pressure and venting in the tank,
• protection against the ingress of solid contaminants,
• stable operation of pumps and injectors over the long term.

This makes the cap an important addition to a properly serviced fuel system in Mercedes cars with diesel engines.

Operational characteristics and condition

The item comes from the secondary market, which allows for an economical replacement while maintaining the manufacturer's original specifications. A used fuel filler cap is a solution often chosen for maintenance repairs when the factory component has suffered mechanical wear, thread damage, or issues with closing. Using an original component from the same model line reduces the risk of mismatch and facilitates installation in the existing filler socket.

Expanding the fuel filler system and part selection

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

To better understand the impact of the fuel filler condition and its seal on the entire fuel system, it is worth reading the technical guide on diagnostics and maintenance, available in the article Fuel system – injectors, pumps, and fuel tank: maintenance and regeneration. This will allow you to consciously select components and optimize the service of the fuel system in your Mercedes.