Original MANN-FILTER Fuel filter WK 939 – For Passenger Cars

MANN‑FILTER Fuel Filter WK 939

The MANN‑FILTER Fuel Filter WK 939 is a high‑performance, OEM‑grade filtration solution designed specifically for passenger cars and light commercial vehicles. It delivers superior protection for the engine’s fuel system by capturing contaminants that could otherwise compromise combustion efficiency, reduce power output, or cause premature wear of critical components.

Key Design Features

• Advanced Filtration Media: Utilises a multi‑layered filter element engineered to trap particles as small as 0.5 µm while maintaining low pressure drop for optimal fuel flow.
• Durable Construction: The filter housing is made from high‑strength polypropylene, resistant to chemical attack and capable of withstanding the harsh conditions inside a fuel line.
• Compact Size: With an outer diameter of 108 mm and a height of 134 mm, it fits seamlessly into tight engine bay spaces without compromising airflow.
• Easy Installation: Designed for quick removal and replacement; the filter can be installed in under five minutes with standard tools.
• Long Service Life: Engineered to provide reliable performance over extended mileage intervals, reducing maintenance frequency.

Compatibility Overview

The WK 939 is engineered for a broad range of vehicle models. Below is a concise compatibility matrix highlighting the most common applications:

For a complete list of supported vehicles, consult the manufacturer’s official catalog or technical data sheet.

Performance Benefits

• Engine Protection: By filtering out dirt, rust particles, and other contaminants, the WK 939 safeguards fuel injectors, pumps, and valves from clogging and wear.
• Fuel Efficiency: Clean fuel flow ensures optimal combustion, which can translate into measurable gains in fuel economy.
• Reduced Emissions: A cleaner fuel system contributes to lower exhaust emissions, helping vehicles meet stringent environmental regulations.
• Reliability: Consistent filtration performance over time reduces the likelihood of engine misfires or stalling caused by contaminated fuel.

Installation Procedure

1. Locate the existing fuel filter in the vehicle’s fuel line. It is typically positioned near the fuel pump or along the main feed line.
2. Disconnect the fuel lines using a suitable wrench, ensuring that any residual fuel is safely drained into an appropriate container.
3. Remove the old filter housing and discard the used filter element.
4. Insert the new WK 939 filter housing, aligning it with the mounting flanges. Tighten securely but avoid overtightening to prevent damage.
5. Reconnect the fuel lines, checking for leaks. A gentle pressure test can confirm a proper seal.
6. Start the engine and observe for any abnormal noises or warning lights. The filter should operate silently under normal conditions.

Maintenance Tips

• Inspect the fuel filter during routine service intervals, especially if the vehicle operates in dusty or high‑contamination environments.
• Avoid using aftermarket filters that do not meet OEM specifications; they may compromise filtration efficiency.
• If the engine exhibits reduced performance or increased fuel consumption, consider replacing the filter sooner than scheduled.

Technical Specifications

Why Choose MANN‑FILTER?

MANN‑FILTER is a globally recognised brand synonymous with quality and reliability in automotive filtration. The WK 939 benefits from:

• Rigorous testing under real‑world conditions.
• Compliance with ISO, SAE, and OEM standards.
• A comprehensive network of service centers for support and technical assistance.

By selecting the MANN‑FILTER Fuel Filter WK 939, vehicle owners invest in long‑term engine health, consistent performance, and peace of mind knowing that their fuel system is protected by a proven, industry‑leading solution.