The best CAT water separator filter depends on the replacement part number and whether you need one filter or a service pair. The CAT 175-2949 is a practical choice when that exact part is required; the 256-8753 is an alternative with a listed Fleetguard FS1000 cross-reference. For FASS lift-pump systems, the two-filter kit also includes a CAT 1R-0750 fuel filter. Compare the part numbers, thread details, and package contents before ordering.
| Product | Best For | Key Detail |
|---|---|---|
| CAT 175-2949, single | Replacing one 175-2949 | 1-14 thread; 185 mm tall |
| CAT 175-2949 and 1R-0750 kit | FASS lift-pump filter changes | Includes two filter types |
| CAT 256-8753, single | Replacing one 256-8753 | Cross-reference: FS1000 |
| CAT 175-2949, two-pack | Keeping a spare 175-2949 | Two advanced-efficiency filters |
| CAT 256-8753, two-pack | Keeping 256-8753 filters on hand | Two filters; FS1000 cross-reference |
CAT 175-2949 Single Separator
This genuine CAT 175-2949 advanced high-efficiency fuel water separator is best for a buyer replacing a single filter with the same part number. Its listed thread size is 1-14, and its height is 185 mm, giving buyers two specifications to compare with the existing filter and equipment requirements.
Choose this option when the service documentation or removed filter calls for 175-2949. It is a straightforward single-filter selection rather than a kit with an additional fuel filter. The product information does not list supported equipment models, so confirm application and fit before ordering; matching the part number alone may not establish suitability for every setup.
CAT Separator And Filter Kit
This kit is best for buyers servicing a FASS lift-pump system who need both a CAT 175-2949 fuel water separator and a CAT 1R-0750 fuel filter. The listing describes both as genuine CAT filters and identifies the set as a replacement combination for FASS diesel lift-pump systems.
The threaded spin-on design and sealing gaskets are listed as installation features, and the listing says no modifications are required for the described replacement use. Choose this kit over a single separator when both filters are due for service. Its stated application is FASS lift pumps, so avoid assuming it is the right combination for other systems without checking the equipment and filter specifications.
CAT 256-8753 Single Separator
The CAT 256-8753 is best for a buyer whose required replacement number is 256-8753 or whose application calls for the listed Fleetguard FS1000 cross-reference. The product is described as an advanced-efficiency fuel water separator and is sold as a single filter.
Compared with the 175-2949 options, this is the better choice only when the 256-8753 part number or cross-reference matches the service requirement. The listing does not provide dimensions, thread size, or a list of compatible machines. Verify those details with the existing filter or equipment documentation before purchase.
CAT 175-2949 Separator Two-Pack
This two-pack is best for buyers who need two CAT 175-2949 filters or want a matching spare after confirming the required part number. The listing specifies advanced efficiency and a 1-14 thread size for the filters.
Choose the two-pack when the quantity is useful for planned maintenance; choose the single filter if only one is needed. The supplied details do not state the height for this package or identify specific vehicle and equipment applications. Check the filter’s fit requirements rather than relying on the pack size or thread detail alone.
CAT 256-8753 Separator Two-Pack
This pack is best for buyers who need two 256-8753 separators or want an additional filter available for later service. It is described as advanced efficiency and lists Fleetguard FS1000 as a cross-reference.
Compared with the single 256-8753, this option provides two filters while retaining the same stated part number and cross-reference. It may be less suitable when you need only one filter or have not confirmed that 256-8753 matches your system. The listing does not provide dimensions or equipment fitment, so verify both before ordering.
Buying Guide: How To Choose A CAT Water Separator Filter
Which part number should you match?
Start with the number specified in the equipment service information or printed on the existing filter. The products here use two different separator numbers: 175-2949 and 256-8753. They should not be treated as interchangeable based only on the fact that both are CAT fuel water separators.
Do you need a single filter or a kit?
A single filter suits a one-filter replacement. The FASS-oriented kit includes a 175-2949 separator and a 1R-0750 fuel filter, making it relevant when both listed filter types are needed for that setup. Two-packs are useful when two matching separators are required or a spare is wanted, but package quantity does not confirm fit.
Which specifications should you verify?
- Match the separator part number to the equipment requirement.
- For the 175-2949, compare the listed 1-14 thread and 185 mm height with the required specifications.
- For the 256-8753, check whether the FS1000 cross-reference is appropriate for the application.
- Confirm the package contents and quantity before ordering.
- Check equipment documentation when dimensions or compatibility are not provided in the product details.
Frequently Asked Questions
What does a fuel water separator filter do?
It is a fuel-system filter identified as a water separator. The listed products are intended for diesel fuel applications, but the supplied details do not specify the performance conditions for each equipment model.
Are CAT 175-2949 and 256-8753 the same filter?
No. They are listed as different CAT part numbers. Select the number required by your equipment rather than assuming one replaces the other.
Does the CAT 175-2949 fit every FASS lift pump?
The kit listing describes its 175-2949 and 1R-0750 combination as a replacement for FASS lift-pump systems. Confirm the exact system requirements before purchase.
What is the Fleetguard FS1000 cross-reference for?
The CAT 256-8753 listings identify Fleetguard FS1000 as a cross-reference. Verify that the reference applies to your specific equipment before choosing the filter.
Should I buy a single filter or a two-pack?
Buy a single filter when one replacement is required. Choose a two-pack when you need two matching filters or have a reason to keep a spare, after confirming the correct part number.