CAT Fuel/Water Separator Pack of 2 — 93 mm Primary Filter, Advanced Efficiency

CAT 256-8753 Fuel/Water Separator (pack of 2) is a primary fuel filter designed to remove water and particulate contamination from diesel systems on compatible Caterpillar engines.

This pair of genuine-style fuel/water separators is built to protect fuel injectors and fuel pumps by trapping water and solid debris before they enter the engine. Rated at advanced efficiency, these 256-8753 filters cross-reference Fleetguard FS1000 and have a 93.0 mm diameter, making them a direct fit for many heavy-duty Caterpillar truck engines.

How does the 256-8753 improve fuel system reliability?

The separator uses multi-stage media to collect both free water and fine particulates, helping prevent corrosion and wear in downstream components. By keeping contaminants out of the fuel rail and injectors, it reduces the risk of fuel-related failures and supports steady engine performance under heavy loads.

• Primary filtration stage removes larger debris before secondary filters.
• Water collection chamber isolates free water for easy draining or sensor activation.
• Advanced efficiency media captures fine particulates to protect injectors.
• Made in USA construction for consistent quality and durability.

Which engines and models are compatible with this part?

The CAT 256-8753 is intended for use on a range of Caterpillar truck engines commonly found in line-haul and vocational applications. It's compatible with C-10, C-12, C13, 3176, and C15 engines when the system calls for this primary fuel/water separator specification.

• Fits Caterpillar C-10 and C-12 engine families.
• Compatible with C13 and C15 heavy-duty engines.
• Also suits the 3176 industrial/truck engine series.
• Cross-references Fleetguard FS1000 for aftermarket equivalence.

How do I install and maintain these filters?

Installation follows standard primary fuel filter procedures: relieve fuel system pressure, remove the old element, and replace with the new 256-8753 while ensuring sealing surfaces are clean. Regular inspection and replacement intervals depend on operating hours, fuel quality, and manufacturer guidance; frequent checks are recommended in high-moisture or dusty environments.

• Always depressurize the fuel system before service.
• Wipe mounting and sealing surfaces to prevent leaks.
• Replace as a pair or per scheduled maintenance for consistent protection.
• Monitor water-in-fuel sensors and drain collection bowls if present.

What are the physical and performance specs to verify fit?

The 256-8753 has a 93.0 mm outer diameter and is designated as a primary separator with an advanced efficiency rating. If your equipment references Fleetguard FS1000 or lists this CAT part number, this pack-of-two set is intended to meet that specification for fit and filtration performance.

• Part number: CAT 256-8753 (pack of 2 filters).
• Efficiency rating: Advanced Efficiency for primary filtration.
• Diameter: 93.0 mm nominal outer diameter.
• Cross-reference: Fleetguard FS1000 for equivalent aftermarket use.

Who is this for: fleet managers, owner-operators, and maintenance technicians who service Caterpillar-powered trucks and need a reliable primary fuel/water separator that meets OEM-style specifications. This two-pack is useful for scheduled replacements, minimizing downtime with a spare on hand, and supporting engines where water contamination and fine-particle protection are priorities.