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Cummins Fuel Water Separators
Fleetguard FS1098 Fuel Water Separator
A spin-on fuel water separator listed for Cummins B6.7 and L9 engines. It removes water and particulate ahead of the final-stage fuel filter — not the filter beside it. Confirm the stage, housing interface and old number before ordering.
- Part number
- FS1098
- Type
- Spin-on fuel water separator
- Engine reference
- Cummins B6.7 and L9
What the FS1098 Element Is
The FS1098 is a spin-on separator with StrataPore media, Fleetguard’s multi-layer synthetic composite. Water coalesces in the housing bowl, where the drain removes it before fuel reaches the final-stage filter. Listings give 229 mm height and 120 mm outside diameter.
A separator is not a fuel filter. It takes out water and coarse particulate; the final-stage element protects the injectors. Both are sold as fuel filters, which is how the wrong one gets ordered. Cummins fuel filters covers the other stage.
Engine model & build
Provide the engine maker, model and full serial or build number. The model name alone does not confirm fitment.
Separator vs final-stage position
Confirm the installed position: this is the water separator, not the final-stage fuel filter beside it. Check the filter head and whether a final-stage element sits downstream.
Complete old part number
Send the full number printed on the removed element, including any suffix, and note whether it superseded FS20038. If the records disagree, send all of them for review.
FS1098 Specifications
Published fields for the FS1098 separator. Values are as listed for the Cummins B6.7 and L9 applications; confirm the housing interface and the old part number before ordering.
| Specification | Value | How to confirm |
|---|---|---|
| Media type | StrataPore high-efficiency filtration media | Declared by Fleetguard |
| Filtration rating | 10 micron | Declared by Fleetguard |
| Water separation | Approximately 95% emulsified water removal efficiency | Declared by Fleetguard |
| Overall height | 9.018 in (229.06 mm) | Measure or match the old element |
| Largest outside diameter | 4.724 in (120 mm) | Measure or match the old element |
| Thread size | 4.685 in (119 mm), buttress thread form (4.0 mm pitch) | Match the old element |
| Housing | Eco-friendly composite housing with integrated drain valve and water-in-fuel (WIF) sensor port | Check the filter head |
| Fuel compatibility | Diesel, ultra-low sulfur diesel (ULSD) and biodiesel | Confirm against your fuel specification |
Swipe horizontally to view all columns.
What the FS1098 Is Listed For
| Listed application | OEM lead | How to confirm |
|---|---|---|
| Cummins B6.7 / ISB6.7 / QSB6.7 | 5319680 | Engine build, filter head |
| Cummins L9 / ISL9 / ISL8.9 | 5308722 | Engine build, filter head |
| Freightliner M2 106, Mack MD6, Autocar | Not stated | Housing number |
| Wirtgen W100CFI / W120CFI / W130CFI | Not stated | Housing number |
Fitment follows the engine build and the filter head, not the model year. The listings are leads, not fitment claims. The housing named most often is FH21462; some listings also give FH143 and FH21464, so read the head.
Confirm Before You Order
Five checks before ordering.
- The complete number from the element body or label.
- The engine build: make, model, full serial or build number.
- The filter-head number and the sensor/drain arrangement.
- Whether the sensor is reused or replaced.
- Quantity, and whether a service gasket is needed — listings name SP72459.
A matching thread or diameter does not confirm media, water separation or sensor fitment. Where records disagree, send both. Filter lookup helps when the number is worn.
Genuine Element or Alternative
The media is the part. Aftermarket sellers publish micron and water-separation claims that differ from each other. Declare genuine or alternative before we quote — they are separate offers, not blended silently.
We do not claim authorized-dealer status for Cummins, Fleetguard or any filter brand. Counterfeit and repacked elements circulate, so buy through a traceable route. How we verify a filter covers the checks.
Request a QuoteFrequently Asked Questions
Is the Fleetguard FS1098 a fuel filter or a water separator?
It is a fuel/water separator. It removes water and particulate before the final-stage filter, which protects the injectors. Different numbers, different jobs.
Is FS1098 the same as FS20038?
Dealers list FS20038 as the number FS1098 replaces. Confirm the supersession against the housing and the Fleetguard catalogue; they are not interchangeable.
What engine does FS1098 fit?
Listings name Cummins B6.7, ISB6.7 and QSB6.7, and L9, ISL9 and ISL8.9, roughly from 2017. Confirm the build and the filter head.
Ordering the FS1098 Separator
FS1098 is the water-removal stage for Cummins B6.7 and L9 applications; FS20038 is the listed superseded number. The housing and sensor interface decide fitment.
Send the engine build, the housing number and the number from the old element; genuine and alternative offers are quoted separately. Request a quote or send a multi-unit parts list.