Hengst H278WK Fuel Filter - In-Line

Hengst HEZ Fuel Filter H278WK Overview

The Hengst HEZ Fuel Filter H278WK is an in-line fuel filter built with synthetic blend filter media for diesel fuel systems that require water-sensor connectivity and biodiesel resistance. It is a direct-fit option for select Mercedes-Benz, Jeep, Dodge Sprinter, and Smart applications, including Mercedes-Benz GL350, ML350, and R350 models.

The HEZ Fuel Filter line focuses on application-specific fuel filtration for vehicles that use integrated sensor connections and diesel fuel management components. Part number H278WK is listed for in-line installations and is referenced for multiple OE-style replacement applications.

Key Features

• Synthetic blend filter media for fuel filtration performance
• In-line fuel filter configuration
• Includes connector for water sensor
• Biodiesel resistant construction
• 3-pin electrical connector
• Fits select Mercedes-Benz, Jeep Grand Cherokee, Dodge Sprinter 2500/3500, and Smart Fortwo diesel applications

Detailed Description

Hengst H278WK is a fuel filter for diesel vehicles that use an in-line filter layout with water-sensor integration. It is listed for 2005-2013 applications across Mercedes-Benz R350, GL350, ML350, GL320, ML320, R320, E320, and Vito models, plus Jeep Grand Cherokee, Dodge Sprinter 2500 and 3500, and Smart Fortwo. The synthetic blend media is paired with biodiesel-resistant construction to support fuel-system filtration in vehicles using diesel blends. This part number, H278WK, also cross-references CSF 3934 for the same application.

What It Helps Address

• Fuel contamination in diesel systems
• Water detection service needs in filters with sensor connections
• Restricted fuel flow from a loaded or aging filter
• Maintenance replacement for diesel fuel filtration service
• Fitment-specific replacement needs for Mercedes-Benz GL350, ML350, and R350 models

Installation Notes and Tips

Confirm the vehicle uses an in-line fuel filter with a 3-pin electrical connector and water-sensor connection before ordering. Review the exact model year and notes for your application, since fitment varies by platform and sensor configuration. For example, Fits 2010-2012 Mercedes-Benz GL350, In-Line; Fits 2010-2011 Mercedes-Benz ML350, In-Line; and Fits 2007-2009 Dodge Sprinter 2500, N/A. Verify connector style and sensor fittings during service, and replace the filter according to the vehicle maintenance schedule.

Quality Assurance

Hengst supplies filtration components for automotive fuel systems, and the HEZ Fuel Filter line is built around application-specific fitment and diesel-system requirements. Part number H278WK is listed with OE-style interchange references for direct replacement use.