Fleetguard Filter #FS1221

Dirty fuel is one of the fastest ways to tear up a diesel. Water, dirt, and junk floating around in your tank can chew up injectors and fuel pumps before you even know what happened.

The Fleetguard FS1221 upgraded fuel filter with water separator is built to keep that mess out of your fuel system. Designed specifically for 1989–1993 Dodge trucks running the legendary 5.9L 12-valve Cummins, this heavy-duty spin-on filter removes contaminants and separates water so your engine gets clean fuel every time you hit the key.

What makes the FS1221 a popular upgrade for first-gen Cummins trucks is its larger design—almost twice as tall as the factory filter, giving you improved filtration capacity and better protection for your injection system.

Built by Fleetguard (Cummins Filtration), this filter is made for engines that actually work for a living—whether that truck is hauling, towing, or just putting in miles like a proper diesel should.

Features

• Upgraded fuel filter with built-in water separator

• Designed for 1989-1993 Dodge 5.9L 12-valve Cummins trucks

• Larger filter body for increased filtration capacity

• Helps remove dirt, debris, and water from diesel fuel

• Protects injectors and fuel system components

• Heavy-duty spin-on design for easy service

If you’re keeping a first-gen Cummins running the way it ought to, the Fleetguard FS1221 is a solid upgrade that helps keep your fuel clean and your diesel ready to work.