Caterpillar 326-1641 3261641 Fuel Water Separator Advanced High Efficiency

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Advanced Efficiency Fuel Water Separator

Cat Advanced Efficiency Fuel Water Separators are designed to eliminate virtually all free water and 90% emulsified water along with smaller contaminates while helping extend the life of your fuel filter and sophisticated fuel injectors.

Injector erosion causes loss of power and increased fuel burn, which is why it's critical to protect your injectors by choosing longer-lasting Cat Fuel Water Separators. Manufactured in our own facilities, we control the quality of the parts you need to keep your equipment performing at optimum levels.

This results in more uptime and lower repair costs for your business.


  • Unique filter media provides unsurpassed protection.
  • Acrylic beads prevent bunching
  • Spiral roving provides greater pleat stability and maximum dirt holding capability
  • Nylon center tube prevents metal contamination
  • Molded end caps prevent leaks


Efficiency Rating: Advanced Efficiency


Forest Products


Wheeled Excavator
W345C MH

Engine - Generator Set
C13 C13GENSET C15 C18 C27 C32 D450GC POWER SYS

Engine - Truck
C13 C15

Petroleum Products
C15 C18 C27 C32 CX31-C11I CX31-C13I CX31-P600 CX35-P800 TH31-C9T TH35-C11I TH35-C13I TH35-C13T TH35-C15T TH35-E81 TH48-E70

Underground Articulated Truck

345C 345C L 345C MH 345D 345D L 349D 349D L 349D2 349D2 L 365C 365C L 365C L MH 385C 385C FS 385C L 385C L MH

Engine - Industrial
3412C C-12 C-15 C-16 C-9 C11 C13 C15 C15 I6 C18 C18 I6 C27 C32 C7 C9 D450GC D500GC D550GC D600 GC

Wheel Tractor-Scraper
631E 637E

Load, Haul, Dump

* All fitment filter part numbers are based on your engine serial number.
* Please confirm with our team if you are unsure this filter will fit your engine.