Fleetguard FS1212 | Fuel/Water Separator

Fleetguard® FS1212 premium fuel water separator spin-on works to remove water and other particulates and ensures clean fuel is delivered to your engine. 

Quick Cross-Reference Guide:

• Baldwin: BF1212
• Donaldson: P558000 / FFP55-8000
• Ryco: Z824
• WIX: 33405
• NAPA: 3405
• Cummins: 3308638, 3315843
• Volvo: 36849
• Ingersoll-Rand: 57138554
• Fram: PCS5059

As a genuine Cummins Filtration product, this spin-on filter is specifically engineered to deliver clean fuel to your engine, minimizing downtime and safeguarding critical injection system components. Water is the primary enemy of modern diesel fuel systems, leading to corrosion, component wear, and lost efficiency. The FS1212 combats this with high-performance filtration media that achieves an overall 96% particulate efficiency while removing up to 96% of emulsified water and 90% of free water. Commonly used as the shorter alternative to the FS1000 filter, it fits the same mounting head and is highly trusted for heavy-duty commercial trucks, agricultural equipment, and industrial applications.

Key Benefits & Features

• Advanced Water Separation: High-efficiency separation keeps both free and emulsified water out of your fuel injectors.
• Durable Spin-On Design: Built with a heavy-duty metal housing designed to withstand extreme vibration and pressure variations.
• Maximum Engine Protection: Extends the lifespan of fuel pumps and injectors by stripping away abrasive particulate contaminants down to 20 microns.
• Reliable OE Quality: Manufactured to exact Cummins specs, ensuring an exact fit and a leak-free seal.

Primary Engine & Vehicle Applications

• Cummins Engines: 855 Big Cam (Mechanical, 1976–1993) and N14 (Celect / Celect Plus, 1993–2002) families.
• Common Heavy-Duty Fleets: Kenworth (W900, T800, T600), Peterbilt (379, 359, 378), Freightliner (Classic, FLD120), International (9300/9400 Eagle), and various Volvo/Western Star setups running N14 specs.

Technical Specifications

• Product Type: Spin-On Fuel/Water Separator
• Thread Size: 1-14 UNS-2B
• Overall Height: 201.17 mm (7.92 in)
• Largest Outer Diameter (OD): 93.22 mm (3.67 in)
• Seam Outer Diameter (OD): 93.73 mm (3.69 in)
• Gasket Outer Diameter (OD): 71.88 mm (2.83 in)
• Gasket Inside Diameter (ID): 62.48 mm (2.46 in)
• Particulate Efficiency (TWA): 96% (per SAE J1985)
• Micron Rating: 20 µm
• Emulsified Water Separation: 96%
• Free Water Separation: 90%
• Standpipe: No