Wix 33149 Fuel Filter - Secondary

Fuel filtration for Mercedes-Benz diesel applications

The Wix 33149 fuel filter is a spin-on fuel filter built for diesel fuel system protection in demanding driving conditions. It uses enhanced cellulose media with a 10 micron rating to help capture fine contaminants while supporting OEM fuel filter change intervals.

Compatible with Mercedes-Benz 300D, 300SD, and 300TD applications, this filter is a direct service part for secondary fuel filtration on select 1977-1985 models. The Wix 33149 is also cross-referenced to Purolator F50359 for the same application.

Key features

• Spin-on fuel filter design for straightforward service replacement
• 10 micron enhanced cellulose media for fine particle filtration
• Closed top with 14x1.5 mm thread size
• 3.404 in. height and 2.939 in. outer diameter
• 280 burst pressure rating for fuel system durability
• Built for light-duty diesel service

Application details

Wix 33149 is engineered for normal and severe driving conditions, including dirt roads, construction sites, stop-and-go traffic, short trips, and interstate travel. It is a practical choice for Mercedes-Benz 300D fuel filter replacement, Mercedes-Benz 300SD secondary fuel filter service, and Mercedes-Benz 300TD diesel fuel filtration where the listed fitment applies. The filter media and construction are selected to maintain consistent fuel flow while helping protect injectors and other fuel system components from contamination.

What this fuel filter helps address

• Fuel contamination from dirt and sediment
• Restricted fuel flow caused by a loaded filter
• Injector wear related to fine particulate debris
• Service intervals that call for OEM-style fuel filter replacement
• Diesel drivability issues tied to poor filtration

Installation notes and tips

Verify the thread size, filter height, and mounting style before installation. This spin-on fuel filter uses a closed top design and is listed for secondary position on 1980-1985 Mercedes-Benz 300D, 300SD, and 300TD, with N/A position fitment on 1977-1979 Mercedes-Benz 300D, 300SD, and 1979 Mercedes-Benz 300TD. Replace the filter at the service interval specified for the vehicle and inspect the sealing surfaces during installation.

Quality assurance

Wix fuel filters are built with application-specific media and durable construction to support reliable filtration under varied operating conditions. The 33149 follows Wix’s OE-style service approach for fuel filter maintenance on the listed Mercedes-Benz diesel applications.