OEM & Private Label
FS1003 Fuel Water Separator
The NAKATU FS1003 is an aftermarket spin-on fuel-water separator, a replacement for the Fleetguard FS1003. It helps separate water from diesel fuel and captures particulate contaminants in compatible filtration systems. Reference applications include selected Cummins diesel fuel systems and equipment using the FS1003 filter specification. Please confirm the installation interface, filter size, and equipment part number before ordering.
Specifications
- Model:
- NAKATU FS1003 Fuel Water Separator
- Product Type:
- Fuel Water Separator Filter
- Replaces:
- Baldwin BF1293-SPS; Donaldson P551103; WIX 33604; NAPA 3604; FRAM PS8687; Luber-Finer LFF1003; HIFI-FILTER SN40541; Hengst H375WK
- Applicable engine number:
- Selected Cummins diesel fuel systems; equipment specified for Fleetguard FS1003 or Cummins 3406889. Confirm engine model, equipment serial number and filter mounting specifications.
- Key Specifications:
- Thread Size: 1-14 UNS-2B Height: 248.67 mm (9.79 in) Gasket Inside Diameter: 62.30 mm (2.45 in) Largest Outside Diameter: 94.30 mm (3.71 in) Gasket Outside Diameter: 72.00 mm (2.83 in)
- OEM Part Numbers:
- Cummins 3406889, 4070801, 4343955
Product Overview
The NAKATU FS1003 is an aftermarket spin-on fuel-water separator intended as a replacement for Fleetguard FS1003. It is designed for compatible diesel fuel filtration systems where the original FS1003 specification is required.
The filter helps separate water from diesel fuel and capture particulate contaminants before they reach sensitive fuel injection components. Water and dirt in diesel fuel can contribute to corrosion, injector wear and fuel system problems.
Key Features
- Spin-on fuel-water separator configuration
- Helps separate water from diesel fuel
- Captures particulate contaminants in compatible filtration systems
- Fleetguard reference height: 248.67 mm
- Fleetguard reference largest outside diameter: 94.30 mm
- Fleetguard reference mounting thread: 1-14 UNS-2B
- Fleetguard reference gasket inside diameter: 62.30 mm
- Fleetguard reference gasket outside diameter: 72.00 mm
- Reference filter includes a standpipe
- Confirm sealing arrangement, water collection and drainage requirements before installation
The original Fleetguard FS1003 uses StrataPore filtration media and has published particle filtration and water separation performance specifications. These characteristics describe the original Fleetguard product only. NAKATU media construction and performance must be confirmed independently.
Applications
The FS1003 reference is associated with selected Cummins diesel fuel filtration systems and industrial or heavy-duty equipment using the specified spin-on fuel-water separator.
Cross-reference catalogs also associate this filter with selected Cummins OE part numbers and equipment service applications.
The FS1003 may be used in compatible trucks, industrial engines and heavy-equipment fuel systems where the equipment manufacturer specifies this part number.
Exact machine and engine compatibility must be established from the original filter part number, equipment serial number, engine arrangement and filter head specifications.
Do not assume compatibility with all Cummins engines or all Fleetguard FS-series filters.
Why Choose NAKATU?
NAKATU is an independent aftermarket filtration brand and supplier focused on replacement filters for heavy-duty trucks, construction machinery, mining equipment and industrial diesel engines.
Our product range includes fuel-water separators, diesel fuel filters, engine oil filters, air filters and hydraulic filters.
We support international importers, distributors, wholesalers and equipment parts suppliers with product selection, cross-reference assistance, wholesale quotations and bulk purchasing arrangements.
Cooperation options include OEM projects, private-label programs, product customization and customized packaging, subject to confirmed technical specifications and order quantities.
NAKATU aims to support long-term global B2B relationships through practical product guidance, responsive communication and flexible sourcing services.
Quality & Supply Assurance
Product specifications, dimensions and application requirements should be confirmed before order placement.
Sample approval, inspection arrangements, packaging requirements and shipment terms can be discussed according to customer needs.
For bulk orders, customers should verify the mounting thread, sealing dimensions, standpipe design, water separation performance, filtration efficiency and any required drain or sensor connections.
Disclaimer
Fleetguard, Cummins, Donaldson, Baldwin and other third-party brand names and part numbers are used solely for product identification and compatibility reference.
NAKATU is an independent aftermarket filtration brand and is not affiliated with, authorized by or endorsed by these manufacturers.
Original Fleetguard performance specifications do not establish equivalent NAKATU performance.
Always verify the original part number, equipment configuration, filter dimensions and technical requirements before ordering.
