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Perkins Fuel Water Separators
A water separator is not a fuel filter — Perkins manuals state this plainly. On a Perkins engine, the component in the fuel circuit is usually one of three things: a sediment bowl with no filter element, a water-stripping element, or a combined primary filter/water-separator. It is frequently a unit fitted by the equipment maker rather than a Perkins part at all. Before any number is quoted, the component and the unit have to be identified.
This page covers Perkins fuel water separator selection for tractors, plant, generator sets, marine, and fleet duty — and how to confirm which form and which unit an engine carries.
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Perkins Fuel Water Separator References We List
Perkins 26560145 and 4415122 are the two fuel/water-separator product pages beneath this category. Confirm the unit and the form before ordering.
What This Page Covers, and What It Does Not
This page covers engine-service fuel/water separation only: sediment bowls, water-stripping elements, and combined primary filter/water-separators for Perkins engines.
Engine-Service Fuel/Water Separation
- Sediment bowls / sedimenters
- Water-stripping elements
- Combined primary filter/water-separators
- Racor-type units
- CAV/Delphi-type units
- Donaldson and packager-fitted units
What This Page Does Not Cover
The Perkins fuel filters page carries the primary and final fuel elements, and the Cummins fuel water separators page covers the same role on Cummins engines. The Perkins filter range covers the other positions.
This page is not a fuel-quality or biocide programme, a stock list, a price list, or a fitment certificate.
Confirm the
Unit First
Unit First
Engine-service filtration for Cummins- and Perkins-powered equipment. Cummins and Perkins are applications and original reference names only. Confirm the build, the unit, and the complete part number before ordering. With the unit, the form, and the number off the old element, request a Perkins fuel water separator quote.
Separator Forms by Function
Which replacement an engine needs depends on which of three forms is fitted. A thread match confirms the fitting, not the function.
| Form | What It Is | Has a Filter Element? | Confirm First |
|---|---|---|---|
| Sediment bowl / sedimenter | A bowl that decants water and solids for draining (CAV/Delphi/Lucas type) | No | The unit and its drain fitting — ordering “a filter” here is a wrong part |
| Water-stripping element | A replaceable spin-on element that removes water and some solids | Yes | The element number for the specific unit, not the engine name |
| Combined filter/water-separator | Coarse filtration and water separation in one housing | Yes | Whether it is the primary stage, and its combined-element number |
Confirm whether the component is a separator, a filter, or both — and whose unit it is.
Records to Confirm Before You Order
Five records turn a candidate reference into a confirmed match. Collect them before you request a quote.
Collect These Five Records
-
Engine maker, model, and full serial or build number
The full serial or build number identifies the engine build, not just the model designation.
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Whose unit the separator is
Racor, CAV/Delphi, Donaldson, or the packager’s own — such as FG Wilson.
-
Which form it is
A sediment bowl with no element, a water-stripping element, or a combined filter/water-separator.
-
The complete number printed on the element or bowl you removed
Quote the full number including any suffix, and state whether it has been superseded.
-
Quantity and requirement
Whether one element or a service set, and whether a genuine original is required.
Where two records disagree, send both; the difference usually points to a supersession, a unit variation, or a component fitted from the wrong form last time. For the full sequence, see how to identify the correct engine filter.
Reading a Perkins Fuel Water Separator Number
Two numbering systems describe the same component: the engine maker’s and the unit maker’s — Racor, CAV/Delphi, Donaldson, Baldwin, Fleetguard, or MANN-FILTER. The cross-reference between them is where disagreement starts, and a bare number does not carry the form. A Donaldson or Fleetguard number may match the thread of a Perkins separator without telling you whether the item is a bowl or an element.
Quote the complete number, including any suffix — a truncated number is an incomplete record, and on separators the missing suffix can hide the unit variant.
Perkins 26560145 and 4415122 are the two fuel/water-separator product pages beneath this one: Perkins 26560145 and Perkins 4415122. A number missing from the current record may have been replaced.
Candidate references to review
- Perkins 26560145
- Perkins 4415122
- Unit maker’s number (confirm suffix)
A cross-reference is a candidate to review, not proof of fitment. A bare number does not carry the form; confirm the unit and the complete suffix before ordering.
Multi-Engine Lists and Bulk Supply
For a whole list across several engines, see bulk filter supply. Send the engine model, the serial or build number, the unit the separator is fitted to, and the number printed on the element or bowl you are replacing.
Send a multi-engine fuel/water separator list and receive each line quoted individually, with the unit and complete number stated for every item.
Send a Multi-Engine List →Frequently Asked Questions
What Perkins fuel water separator do I need?
It depends on which unit is fitted and which form it is — a sediment bowl, a water-stripping element, or a combined unit. Identify the unit, confirm the form, then send the build and the old number and we confirm the item.
Is a fuel water separator the same as a fuel filter?
No. A water separator removes water and heavy sediment and may have no filter media; a fuel filter removes particulates. Some units are a combined filter/water-separator, which is a third thing again.
Why is my Perkins fuel water separator not a Perkins part?
On many installations the separator is OEM or aftermarket equipment — Racor, CAV/Delphi, Donaldson, or the packager’s own. The correct element is keyed to that unit and the engine build, not the engine name.
How do I drain a Perkins fuel water separator?
Drain the bowl at the scheduled check and never run with water more than half full. Confirm the exact procedure against the unit and engine manual; this page identifies the component, it does not set a service regime.
Can I use an aftermarket Perkins fuel water separator element?
State the requirement before quoting; any alternative is labelled as one. Compare the form and the unit, not the thread alone.
Confirm the Unit, Then the Number
A Perkins fuel water separator is quoted against a unit, a form, a build list, and a number, in that order. Record the build, the unit, and the old component’s number, then check the offer before it ships. Send the engine model, the serial or build number, the unit the separator is fitted to, and the number printed on the element or bowl you are replacing. We will confirm whether it is a separator, a filter, or a combined unit, and state the offered item and the delivery terms line by line. Request a Perkins fuel water separator quote.
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