Fleetguard FS20121 Fuel Water Separator Filter

Fleetguard Products

$88.74

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Expedited options available at checkout

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SKU:
FS20121
Availability:
In Stock - We sell filters locally that could affect real-time inventory
Features:
Genuine Fleetguard Filter- High-performance filtration media
Shipping:
Discounted UPS Rates – Shipping options, Including Overnight, available at checkout. Orders placed after 2:00pm Eastern time will ship next business day

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Product Overview

Fleetguard FS20121 Fuel/Water Separator

Genuine Fleetguard FS20121 premium spin-on fuel/water separator uses synthetic Microglass media to remove water and harmful particulate contamination, helping support clean fuel delivery and protect critical fuel-system and engine components. FS20121 cross-references Donaldson P582377, Baldwin BF46266-SPS, NAPA 601072, Cummins 5528103 and 5444245, Wirtgen 2705826, Terberg T13017490, and Kalmar JP124890. Fleetguard-verified fitment shows especially strong application coverage with Cummins B6.7 and L9 engines across medium-duty trucks, buses, vocational equipment, coaches, and other on-highway and off-highway platforms.

Top Cross References — Quick Match: Donaldson P582377 • Baldwin BF46266-SPS • NAPA 601072 • Cummins 5528103 • Cummins 5444245

Fleetguard FS20121 Fuel/Water Separator Cross References

Manufacturer or Brand FS20121 Cross-Reference Part Number
Fleetguard FS20121
Donaldson P582377
Baldwin BF46266-SPS
NAPA 601072
Cummins 5528103, 5444245
Wirtgen 2705826
Terberg T13017490
Kalmar JP124890

Genuine Fleetguard FS20121 Filter Features

  • Fuel/water separation: Removes water and harmful particulates to help reduce corrosion, contamination, and fuel-system issues.
  • Synthetic Microglass media: Uses Fleetguard synthetic Microglass filtration media for controlled particulate removal.
  • High particle efficiency: Rated at 10.00 micron (c) at 98.7% primary particle efficiency.
  • Clean fuel delivery: Helps maintain clean fuel flow to protect critical engine and fuel-system components.
  • On-highway and off-highway coverage: Fleetguard-verified fitment spans trucks, buses, vocational equipment, coaches, industrial equipment, and off-highway applications.
  • OE-quality performance: Designed to meet or exceed applicable original equipment manufacturer specifications.
Key Applications: Fleetguard-verified FS20121 fitment is concentrated around Cummins B6.7 and L9 engine applications, with extensive coverage across Freightliner, Blue Bird, International, Integrated Coach, Hino, Mack, Kenworth, Western Star, Thomas Built, Autocar, Crane Carrier, and additional equipment platforms. Additional verified engine applications include QSM11, B6.7H, ISL, ISL9, and B4.5S. The complete verified model, engine, and year coverage is grouped by engine family below.

Fleetguard FS20121 Specifications

Click Here to View Fleetguard FS20121 Specifications
Filter Specification Measurement or Value
Filter Type Spin-on fuel/water separator
Media Type Synthetic (Microglass)
Capacity Test Specification SAE J905
Thread Size M95X2-7H
Rated Flow 0.92 gpm / 3.50 L/min
Largest Outside Diameter 4.74 in / 120.30 mm
Gasket Outside Diameter 4.74 in / 120.30 mm
Gasket Inside Diameter 4.00 in / 101.60 mm
Hydrostatic Burst Minimum 149.93 psi / 1034.00 kPa
Primary Particle Efficiency 10.00 micron (c) @ 98.7%
Overall Height 10.53 in / 267.36 mm

Fleetguard FS20121 Equipment Fitment

Click Here to View Fleetguard FS20121 Equipment Fitment by Engine
Manufacturer Equipment / Model Verified Model Year(s)
Cummins B6.7 Applications
Freightliner MC Line 2026, 2025, 2024, 2023, 2022, 2021
Freightliner 108SD 2026, 2025, 2024, 2023, 2022, 2021
Freightliner S2C chassis 2026, 2025, 2024, 2023, 2022, 2021
Freightliner B2 2026, 2025, 2024, 2023, 2022, 2021
Freightliner XC Raised Rail 2021
Freightliner MT55 2026, 2025, 2024, 2023, 2022, 2021
Freightliner RAISED RAIL 2025, 2024, 2023, 2022, 2021
Freightliner S2RV 2021
Freightliner M2 106 2026, 2025, 2024, 2023, 2022, 2021
Freightliner MODULAR RAIL 2026, 2025, 2024, 2023, 2022, 2021
Freightliner M2 2026, 2025, 2024, 2023, 2022, 2021
Freightliner STRAIGHT RAIL 2025, 2024, 2023, 2022, 2021
Freightliner MB Line 2025, 2024, 2023, 2022, 2021
Freightliner MT45 2025, 2024, 2023, 2022, 2021
Freightliner s2 106 rv 2026, 2025, 2024, 2023, 2022, 2021
Freightliner C2 CHASSIS 2021
Freightliner XC Modular Rail 2021
Freightliner XB Line Chassis 2021
Freightliner XC Straight Rail 2021
Freightliner XB Straight Rail 2021
International HV607 2026, 2025, 2023, 2022, 2021
International DURASTAR 4400 2021
International MV60H 2021
International HV507 2026, 2024, 2023, 2022, 2021
International Durastar 2021
International WORKSTAR 2021
International WORKSTAR 7500 2021
International HC607 2021
International DURASTAR 4300LP 2021
International WORKSTAR 7400 2021
International WORKSTAR 7300 2021
International MV607 2026, 2025, 2022, 2021
International DURASTAR 4300 2021
International MV 2022, 2021
International HV 2021
Mack MD7 2026, 2025, 2024, 2023, 2022, 2021
Mack MD6 2026, 2025, 2024, 2023, 2022, 2021
Blue Bird All American FE 2022, 2021
Blue Bird SHL All American 2022, 2021
Blue Bird All American RE 2022, 2021
Blue Bird Vision School Bus 2022, 2021
Blue Bird aac2810-3006 2026, 2025, 2024, 2023, 2022, 2021
Blue Bird aac3401-3502 2026, 2025, 2024, 2023, 2022, 2021
Blue Bird bb2701-2809 2026, 2025, 2024, 2023, 2022, 2021
Blue Bird aac3109-3400 2026, 2025, 2024, 2023, 2022, 2021
Blue Bird bb2200-2509 2026, 2025, 2024, 2023, 2022, 2021
Blue Bird bb2510-2700 2026, 2025, 2024, 2023, 2022, 2021
Blue Bird bb3109-3400 2026, 2025, 2024, 2023, 2022, 2021
Blue Bird bb1800-2199 2026, 2025, 2024, 2023, 2022, 2021
Blue Bird aac3707-3808 2026, 2025, 2024, 2023, 2022, 2021
Blue Bird bb3007-3108 2026, 2025, 2024, 2023, 2022, 2021
Blue Bird bb3503-3604 2026, 2025, 2024, 2023, 2022, 2021
Blue Bird aac3503-3604 2026, 2025, 2024, 2023, 2022, 2021
Blue Bird aac3904-4100 2026, 2025, 2024, 2023, 2022, 2021
Blue Bird aac3007-3108 2025, 2024, 2023, 2022, 2021
Blue Bird saa3904-4100 2025, 2024, 2023, 2022, 2021
Integrated Coach CE School Bus 2026, 2025, 2024, 2023, 2022, 2021
Integrated Coach TC Commercial Bus 2026, 2025, 2024, 2023, 2022, 2021
Integrated Coach 1300 FBC 2026, 2025, 2024, 2023, 2022, 2021
Integrated Coach CE Commercial 2026, 2025, 2024, 2023, 2022, 2021
Autocar Llc. Xspotter On Road 2026, 2025, 2024, 2023, 2022, 2021
Autocar Llc. Xspotter Off Road 2026, 2025, 2024, 2023, 2022, 2021
Autocar Llc. Xpert 2026, 2025, 2024, 2023, 2022, 2021
Hino L6 2026, 2025, 2024, 2023, 2022, 2021
Hino L7 2025, 2024, 2023, 2022, 2021
Hino XL7 2025, 2024, 2023, 2022
Hino 338 2023
Isuzu FTR 2026, 2025, 2024, 2023, 2022
Isuzu FVR 2025, 2024, 2023, 2022
Thomas Built SAF-T-LINER 2026, 2022, 2021
Thomas Built SAF-T-LINER HDX 2021
Thomas Built SAF-T-LN MVP EF 2021
Kenworth T370 2021
Kenworth K270 2021
Kenworth T180 2021
Kenworth K370 2021
Kenworth T380 2021
Kenworth T280 2021
Ottawa Ottawa T2 2021
Ottawa T2 4X2 2021
Capacity Of Texas TJ9000 2021
Capacity Of Texas TJ6500 2021
Capacity Of Texas TJ5000 2021
New Flyer Xcelsior 2021
New Flyer D35LF HYBRID 2021
Tadano AC 2.040-1 2021
Tiffin Motorhomes allegro bay 2021
Cummins L9 Applications
Freightliner M2 112 2026, 2025, 2024, 2023, 2022, 2021
Freightliner 108SD 2026, 2025, 2024, 2023, 2022, 2021
Freightliner 114SD 2026, 2025, 2024, 2023, 2022, 2021
Freightliner RAISED RAIL 2026, 2025, 2024, 2023, 2022, 2021
Freightliner STRAIGHT RAIL 2026, 2025, 2024, 2023, 2022, 2021
Freightliner MODULAR RAIL 2026, 2025, 2024, 2023, 2022, 2021
Freightliner M2 106 2026, 2025, 2024, 2023, 2022, 2021
Freightliner M2 2026, 2025, 2024, 2023, 2022, 2021
Freightliner XC Raised Rail 2021
Freightliner XC Straight Rail 2021
Freightliner XC Modular Rail 2021
International MV607 2026, 2025, 2023, 2022, 2021
International WORKSTAR 7400 2021
International WORKSTAR 7500 2021
International WORKSTAR 7300 2021
International HC607 2021
International HV507 2026, 2023, 2022, 2021
International MV60H 2021
International HV607 2026, 2025, 2023, 2022, 2021
International DURASTAR 4300 2021
International DURASTAR 4400 2021
International WORKSTAR 2021
International MV 2022, 2021
International HV 2022, 2021
Mack LR 2021
Mack GU4 SERIES (GRANITE) 2021
Mack Anthem 2021
Mack Granite 2026, 2025, 2024, 2023, 2022, 2021
Mack LR CHASSIS 2021
Blue Bird All American RE 2022, 2021
Blue Bird All American FE 2021
Blue Bird aac3904-4100 2026, 2025, 2024, 2023, 2022, 2021
Blue Bird aac3707-3808 2026, 2025, 2024, 2023, 2022, 2021
Blue Bird aac3503-3604 2026, 2025, 2024, 2023, 2022, 2021
Blue Bird aac3109-3400 2021
Western Star 4700SB 2025, 2024, 2023, 2022, 2021
Western Star 4700 2022, 2021
Western Star 4700SF 2023, 2022, 2021
Western Star 47X 2025, 2024, 2023, 2022
Integrated Coach RE School Bus 2026, 2025, 2024, 2023, 2022, 2021
Integrated Coach RE Commercial 2026, 2025, 2024, 2023, 2021
Crane Carrier CENTURION 2026, 2025, 2024, 2023, 2022, 2021
Crane Carrier low entry crewcab 2026, 2025, 2024, 2023, 2022, 2021
Crane Carrier LET 2 CHASSIS 2025, 2024, 2023, 2022, 2021
Crane Carrier Low Entry 2021
Autocar Llc. DC-64R 2025, 2024, 2023, 2022, 2021
Autocar Llc. XPERT 2022, 2021
Autocar Llc. Xpert 2021
Hino XL8 2025, 2024, 2023, 2022, 2021
Hino XL9 2024, 2023, 2022, 2021
Hino XL7 2025, 2024, 2023, 2022, 2021
Thomas Built SAF-T-LINER 2026, 2022, 2021
Thomas Built TRAN LIN HDX 2022, 2021
Thomas Built SAF-T-LINER HDX 2022, 2021
Thomas Built Transit Liner 2021
Setra S 417 UL 2025
Setra S 415 LE 2025
Setra S 415 UL 2025
Setra S 515 MD 2025
Setra S 516 MD 2025
Setra S 416 UL 2025
Setra S 416 LE 2025
Mercedes-Benz ANTOS 1835 2025
Mercedes-Benz AROCS 1835 2025
Mercedes-Benz ECONIC E 2630 2025
Mercedes-Benz AROCS 2633 2025
Mercedes-Benz CITARO 2025
Mercedes-Benz AROCS 3227 2025
Mercedes-Benz AROCS 2030 2025
Mercedes-Benz AROCS 1830 2025
Mercedes-Benz ACTROS 1826 2025
Mercedes-Benz ECONIC E 1830 2025
Mercedes-Benz AROCS 1826 2025
Mercedes-Benz AROCS 2630 2025
Mercedes-Benz AROCS 3235 2025
Mercedes-Benz AROCS 2527 2025
Mercedes-Benz ANTOS 2633 2025
Mercedes-Benz ACTROS 2535 2025
Mercedes-Benz AROCS 2027 2025
Mercedes-Benz ANTOS 1827 2025
Mercedes-Benz ANTOS 2435 2025
Mercedes-Benz ECONIC E 1835 HYB 2025
Mercedes-Benz ACTROS 2527 2025
Mercedes-Benz AROCS 3230 2025
Mercedes-Benz AROCS 2627 2025
Mercedes-Benz ANTOS 2433 2025
Mercedes-Benz AROCS 2033 2025
Mercedes-Benz AROCS 2635 2025
Mercedes-Benz AROCS 2533 2025
Mercedes-Benz AROCS 2035 2025
Mercedes-Benz ANTOS 2630 2025
Mercedes-Benz ECONIC E 2635 2025
Mercedes-Benz ACTROS 1827 2025
Mercedes-Benz ECONIC E 1835 2025
Mercedes-Benz AROCS 1827 2025
Mercedes-Benz ANTOS 2427 2025
Mercedes-Benz ANTOS 1826 2025
Mercedes-Benz ACTROS 1835 2025
Mercedes-Benz ANTOS 2430 2025
Mercedes-Benz ANTOS 2635 2025
Mercedes-Benz ANTOS 1830 2025
Mercedes-Benz AROCS 2026 2025
Mercedes-Benz ACTROS 1830 2025
Mercedes-Benz ANTOS 2627 2025
Mercedes-Benz AROCS 2535 2025
Mercedes-Benz AROCS 1833 2025
Mercedes-Benz ANTOS 1833 2025
Mercedes-Benz ACTROS 2530 2025
Mercedes-Benz AROCS 2530 2025
Kenworth T370 2021
Kenworth T480 2021
Kenworth T380 2021
Kenworth T280 2021
Kenworth T460 2021
Kenworth T800 2021
New Flyer D60LF HYBRID 2021
New Flyer Xcelsior 2022, 2021
New Flyer D40LF 2021
New Flyer D60LF 2021
New Flyer D35LF 2021
New Flyer D40LF HYBRID 2021
Tiffin Motorhomes PHAETON 2022, 2021
Tiffin Motorhomes ALLEGRO BUS 2022, 2021
Spartan Motors K2 2022, 2021
Spartan Motors Metro Star 2021
Pierce Impel 2022
Van Hool URBAN BUS 2021
Van Hool Commuter Coach CX 2021
Emergency One Emergency One 2021
KME PANTHER 2021
KME SEVERE SERVICE 2021
KME PREDATOR 2021
Load King 340-105 2020
Load King 340-94 2020
Cummins QSM11 Applications
Kalmar COMMERCIAL RT250 2019
Hoist Lift RS SERIES 2015
Hoist Lift LCH SERIES 2015
Kalmar MILITARY RT240 2013
Kalmar RT240 2013
Cummins B6.7H Applications
Mercedes-Benz ATEGO 1524 2025
Mercedes-Benz ATEGO 1224 2025
Kenworth T280 HYD 2024
Cummins ISL Applications
International HV507 2023
Autocar Llc. XPEDITOR 2022
Kenworth T400 2021
Cummins ISL9 Applications
Gillig LOW FLOOR 2022
Integrated Coach RE COMMERCIAL 2022
Volkswagen 18.330 OT 2021
Cummins B4.5S Applications
XCMG XT870 2014

Cross-reference numbers, specifications, and equipment fitment are provided for identification purposes. Verify the Fleetguard part number and the application details for your equipment before ordering.

Looking for more Fleetguard fuel filters and fuel/water separators? Browse our Fleetguard Fuel Filters category.

Warranty Information

Warranty: Fleetguard products are warranted under normal use and service, to be free from defects in material and factory workmanship (Warrantable Failure). If our product is determined to have a Warrantable Failure, we shall repair, replace or refund such defective product in our sole discretion.