Smart Fortwo W451 Fuel Filler Tank Screw Cap Cover Panel Cover Black A4514700105

Smart Fortwo W451 Fuel Filler Tank Screw Cap Cover Panel Cover is an original component from the Fuel filler flaps and caps group, designed for diesel engine models. It ensures a tight seal for the fuel filler, stabilizes the operation of the diesel fuel system, and protects the tank against contaminants and moisture.

Specifications and technical data

• SKU: A4514700105-1
• 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 function in the fuel system

The Smart Fortwo W451 Fuel Filler Tank Screw Cap Cover Panel Cover has been designed specifically for diesel-powered versions. Its task is to maintain proper filler tightness, which limits fuel evaporation, minimizes the risk of dirt entering the tank, and supports the correct operation of the venting system. In vehicles with a diesel engine, stable pressure and fuel purity are crucial for the durability of the injectors, the pump, and the entire fuel supply system. A properly selected fuel filler cap cover helps limit the ingress of dust particles, sand, or water, which translates into more predictable vehicle operation.

Construction and fitment for Smart Fortwo W451

The component is structurally adapted to the fuel filler socket in the Smart Fortwo W451, ensuring that installation is straightforward and requires no modifications. The properly shaped contact surface and sealing profile ensure correct pressure against the filler edge, which limits blow-by and leaks. The original origin from the Smart brand means that factory dimensional tolerances are maintained, which is particularly important for components that affect the tightness of the fuel system. As a result, the cover works correctly with the existing flap, hinge, and opening mechanism, and the entire assembly maintains a consistent body appearance.

Benefits of using an original cover

Using a dedicated fuel filler cap cover in the Smart Fortwo W451 brings a number of practical benefits:

• maintaining fuel filler tightness in the diesel system,
• limiting the risk of contaminants entering the tank,
• maintaining the correct operation of the venting system and tank pressure,
• consistent visual and mounting fit to the Smart Fortwo W451 body,
• easier diagnostics and part selection thanks to clear OEM marking. This solution is particularly recommended when replacing a damaged, leaking, or missing cover, when you want to maintain factory fuel system performance parameters and the aesthetic appearance of the filler area.

Condition, application, and selection by parameters

The cover comes from a group of used parts, which allows for economical repair while maintaining the manufacturer's original specifications. This is a good solution when you want to restore full functionality to the fuel filler without investing in more expensive replacements with uncertain fitment. For certainty of selection, it is worth verifying the compatibility of the element with your Smart Fortwo W451, taking into account the Diesel fuel type and the OEM markings and interchangeable numbers available in the technical specification. This minimizes the risk of an incorrect purchase and provides you with a part ready for direct installation. 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 covers, caps, or security elements, check the available parts in the Smart fuel filler flaps and caps category.

Fuel system operation and technical knowledge

To fully utilize the potential of the fuel supply system in a diesel engine, it is worth taking care not only of the filler cover itself but also of regular inspection of the condition of the injectors, pump, and fuel tank. A tight filler is one of the elements that helps limit the ingress of moisture and contaminants, and thus supports longer component life. If you want to better understand the relationship between filler tightness, fuel purity, and equipment durability, useful information can be found in the article Fuel system – injectors, pumps, and fuel tank: maintenance and regeneration, where diagnostics, part selection by OEM numbers, and principles of proper operation are discussed.