Wix 33528NP Fuel Filter - Secondary

Heavy-Duty Fuel Filtration

The Wix 33528NP is a spin-on fuel filter built for heavy-duty diesel and commercial equipment applications. It uses synthetic media and a high-strength canister design to support clean fuel delivery in demanding operating conditions.

Compatible with a wide range of medium- and heavy-duty trucks, this fuel filter is a fitment-based replacement for many Ford, Kenworth, Peterbilt, Freightliner, GMC, Chevrolet, and White/GMC applications. The 33528NP is also listed for multiple Blue Bird, Mack, Volvo, and Western Star models.

Key Features

• Synthetic filter media for high-efficiency fuel filtration
• Spin-on fuel filter style for serviceable replacement applications
• No bypass relief valve setting
• 1-14 thread size for listed applications
• Corrosion-resistant construction with sealing components for leak resistance
• Recommended for OEM fuel filter change intervals

Detailed Description

Wix 33528NP fuel filter is engineered for commercial diesel systems that require dependable filtration under sustained load. The closed-top design, synthetic media, and heavy-duty construction support consistent fuel flow while helping protect injectors and other fuel-system components from contamination. This part number, 33528NP, is used across many vocational and over-the-road platforms, including Peterbilt 379, Kenworth W900, and Freightliner FLD120 applications.

Wix HD Fuel Filters are positioned for equipment that operates in trucking, construction, mining, agriculture, and similar duty cycles. The 33528NP is a direct replacement style spin-on filter for listed applications, and the part number 33528NP is commonly referenced in cross-application catalogs for the same service use.

This part cross-references Baldwin BF7633 and Fleetguard FF5320 for the same application.

What It Helps Address

• Restricted fuel flow caused by a loaded or contaminated filter
• Fuel-system wear from particulate contamination
• Service intervals that require a replacement fuel filter
• Leak concerns related to worn sealing surfaces
• Filtration needs in high-duty commercial operation

Installation Notes and Quality

Install as a spin-on fuel filter on the listed applications and verify thread size, height, and sealing surface match before service. Follow the vehicle or equipment maintenance schedule for replacement intervals and prime the fuel system as required after installation.

Wix recommends this filter for OEM fuel filter change intervals, and the construction uses high-strength, corrosion-resistant components with superior sealing materials for long service in demanding operating conditions.