Mercedes-Benz B-Class W245 Fuel Tank Petrol Cap Plug Key Chrome Black

Mercedes-Benz B-Class W245 Fuel Tank Petrol Cap Plug Key Chrome Black is a functional component of the fuel system, designed for vehicles with a petrol engine. It ensures a tight seal of the tank, protecting the fuel from contaminants and reducing evaporation. Thanks to its robust construction and fitment for this specific B-Class generation, it maintains the correct pressure in the fuel system and supports trouble-free vehicle operation.

Specifications and technical data

• SKU: Mercedes W245 Fuel Cap
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: Mercedes W245 Fuel Cap
• Location on the vehicle: Front, Left
• Fuel type: Petrol
• Color: Black
• Category: Fuel Flaps & Components

Purpose and function in the fuel system

The described fuel tank cap has been designed for petrol-powered Mercedes-Benz B-Class W245 models. The component works with the fuel system, stabilizing conditions within the tank and limiting the ingress of moisture and dirt into the fuel. A properly selected cap also helps maintain the correct operating parameters of the venting system, which is important for smooth engine performance and the correct diagnosis of potential faults.

Design, color scheme, and ergonomics

The cap combines a black finish with chrome accents, which blends well with the B-Class body lines and other exterior elements. The applied shape facilitates gripping and unscrewing, while the distinct surface texture improves handling ergonomics, even when wearing work gloves. The design is adapted for installation in the front left part of the vehicle, in accordance with the factory fuel filler location in this model.

Operational safety and technical aspects

The fuel tank cap for petrol engines plays an important role in protecting the fuel system against leaks. A properly selected component:

• limits the risk of contaminants entering the tank,
• supports the maintenance of stable pressure conditions,
• reduces fuel losses resulting from evaporation,
• helps avoid diagnostic errors related to system leaks.

Thanks to its fitment for the specific body series, the cap works with the factory filler neck, which facilitates installation and daily vehicle operation.

Component condition and service application

The offered cap comes from the Fuel tank caps and accessories category, making it a suitable choice when replacing a worn or damaged component in the filler area. It can be used both during standard service maintenance and for repairs related to fuel system leaks or tank venting problems. Using an original solution dedicated to the B-Class W245 allows for maintaining technical consistency with the vehicle's other components.

Selection, diagnostics, and technical knowledge

When replacing the fuel tank cap, it is worth paying attention to compatibility with the fuel type and the design of the filler neck in the bodywork. In case of doubts regarding symptoms related to the fuel system – such as the smell of fuel near the wheel arch, refueling problems, or diagnostic errors – specialized technical material may be helpful. A detailed discussion of the fuel system operation, including the fuel tank and associated components, can be found in the article Fuel system – injectors, pumps, and fuel tank: maintenance and regeneration, which makes it easier to understand the relationships between individual components.

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, covers, or accessory protections, check the available parts in the Mercedes fuel tank caps and accessories category.