Smart Fortwo W451 Fuel Filler Tank Screw Cap Cover A4514700105

Smart Fortwo W451 Fuel Filler Tank Screw Cap Cover is an original component from the Fuel filler flaps and caps category, designed for diesel fuel systems. It ensures a tight seal of the filler neck, stabilizes the operation of the diesel fuel system, and helps maintain proper operating conditions for the tank in your Smart Fortwo W451.

Specifications and technical data

• SKU: A4514700105
• Mark: Smart
• Condition: Used
• OEM Part Number: A4514700105
• Substitutable numbers: A4514700105, A 451 470 01 05
• Fuel type: Diesel
• Part type: Fuel Tank Cap
• Category: Fuel Tank Caps

Purpose and technical function

The presented cap is dedicated to the Smart Fortwo W451 model with a diesel engine. As a component of the fuel supply system, it is responsible for:

• a tight seal of the diesel fuel filler,
• reducing evaporation and contamination in the tank,
• stable operating conditions for the fuel system during daily use.

Thanks to its precise fit to the filler neck, the cap operates in a predictable and repeatable manner, which is essential for long-term vehicle use in both urban and extra-urban traffic.

Design and fit for Smart Fortwo W451

The design of the cap has been developed based on the geometry of the filler neck in the Smart Fortwo W451, which translates into a secure fit and proper interaction with the fuel filler flap. The appropriately selected seal and the shape of the working part minimize the risk of leaks, while the ergonomic form facilitates daily unscrewing and tightening during refueling.

As an element from the Fuel filler flaps and caps category, the cap works with other components of the filler area, creating a cohesive, functional assembly that protects the fuel tank from external factors.

Benefits of use in a diesel fuel system

In diesel-powered vehicles, the tightness of the filler is important for both the durability of the equipment and the quality of the fuel in the tank. Using a properly selected cap in the Smart Fortwo W451 allows you to:

• maintain proper operating conditions for the diesel fuel system,
• limit the ingress of moisture and contaminants into the tank,
• maintain stable operating parameters in the long term.

This solution is particularly important during frequent refueling and when using the car in variable weather conditions, where the fuel system is exposed to temperature and humidity fluctuations.

Characteristics as a used part

The offered cap comes from the secondary market, which allows for an economical replacement of the component while maintaining compliance with factory specifications. A used component of this type is a good choice in situations where the existing cap has suffered mechanical wear, thread damage, or has lost its sealing integrity.

For users considering various purchase options – new, replacement, and used parts – a guide describing the cost-effectiveness of individual solutions may be helpful: original, replacement, and used parts – a comparison of costs and fitment.

Technical support and additional materials

Selecting a fuel filler cap for a specific version of the Smart Fortwo W451 should be combined with an analysis of the fuel system, especially in the case of diesel units. Useful information on diagnostics, operation, and regeneration of fuel system components can be found in the article: fuel system – injectors, pumps, and fuel tank: maintenance and regeneration.

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