Fleetguard FS1022 Fuel Filter — 1-Pack Primary Diesel Filter, Cummins 3800394 Fit, Water Separation

The Fleetguard FS1022 is a single-pack primary fuel filter engineered to protect diesel engines by trapping contaminants and fitting Cummins applications that accept part 3800394.

This FS1022 fuel filter by Fleetguard is designed as a rugged, reliable in-line replacement for primary diesel fuel filtration. It fits applications that list Cummins 3800394 and serves as a drop-in alternative to Cummins 3406889, Donaldson P551003, and the Fleetguard FS1003. Built for heavy-duty use, the FS1022 balances filtration efficiency with service life to help maintain engine performance and reduce injector wear from particulate and water intrusion.

What vehicles and engines accept the FS1022?

The FS1022 matches equipment that specifies Cummins 3800394 and is commonly used across medium- and heavy-duty diesel platforms with compatible filter mounts. Check your engine parts manual or existing filter part number to confirm interchangeability before purchase.

• Direct fit for Cummins applications listing part 3800394
• Interchangeable with Cummins 3406889 and Donaldson P551003
• Replaces Fleetguard FS1003 where specified
• Suitable for many on-highway and industrial diesel systems using this primary filter type

How does the FS1022 help protect my diesel engine?

The FS1022 is built to capture dirt, rust, and other particulate contaminants while also separating free water from fuel. Cleaner fuel entering the injector system reduces abrasive wear and helps maintain consistent combustion quality over service intervals.

• Removes solid contaminants to protect fuel injectors and pumps
• Designed to separate and collect free water from diesel fuel
• Durable construction for reliable sealing and reduced bypass risk
• Manufactured to Fleetguard quality standards for consistent performance

What installation and maintenance should I expect?

Installing the FS1022 follows standard spin-on fuel filter procedures: relieve system pressure, drain as needed, remove the old filter, lubricate the gasket, and hand-tighten the new unit per torque guidelines. Routine replacement intervals depend on engine hours, fuel quality, and operating conditions; always follow the equipment manufacturer’s service schedule.

• Spin-on design for straightforward removal and fitment
• Replace at OEM-recommended intervals or when fuel contamination is suspected
• Inspect filter housing and seals during each service
• Use compatible tools and follow torque/priming steps in the service manual

Why choose Fleetguard FS1022 over alternatives?

Fleetguard produces filters engineered for industrial reliability and consistent manufacturing tolerances, helping ensure a proper seal and predictable flow characteristics. Choosing an FS1022 provides an OEM-level replacement option backed by a widely recognized filtration brand and compatibility with several common part numbers.

• OEM-quality filtration media and components
• Interchangeable with several manufacturer part numbers for easier sourcing
• Single-pack option for targeted replacement needs
• Designed for heavy-duty diesel service environments

Who is this for: The Fleetguard FS1022 (1-pack) is intended for fleet managers, diesel technicians, and owners of medium- to heavy-duty diesel equipment who require a reliable primary fuel filter that fits Cummins-specified applications. It’s a practical choice when you need a single replacement unit that matches Cummins 3800394 specifications and commonly accepted replacement part numbers such as Cummins 3406889, Donaldson P551003, or Fleetguard FS1003. Verify fitment against your engine’s parts list before ordering to ensure correct interchangeability.