Marine diesel fuel filter cross-reference chart (Kubota / WIX / Baldwin / Fleetguard)

Fuel filter cross-reference for Kubota-based marine diesels (Beta, Nanni, Universal). Covers the Kubota 15221-43170 spin-on and element filters with WIX, Baldwin, Fleetguard, and Donaldson equivalents.

The Kubota fuel filter family

The Kubota blocks under most small marine diesels share a small number of fuel filters. See the base-engine guides for Beta, Nanni, and Universal. Buy the Kubota or aftermarket number.

Spin-on: Kubota 15221-43170 (M20×1.5, about 72 mm OD)

This spin-on is the common Kubota fuel filter. Makers fit it across the D722, D902, D1005, D1105, V1505, V2203, and V3300 family. Marine derivatives include Beta 10-35 and up, plus Nanni and Universal Kubota models.

Element type: Kubota 1G311-43380 (V-series / larger)

Some V-series and larger installations use a filter element in a housing.

A related Kubota 05-series filter is 15521-43160. That number crosses to WIX 33507, Fleetguard FF5103, and Donaldson P502161. 15521-43160 and 15221-43170 are distinct, adjacent Kubota numbers. Match your number exactly.

Other base engines

• Lombardini LDW FOCS-series (502/702/1003/1404M): Lombardini ED0021752630-S → Baldwin BF790,

Fleetguard FF5040, Mann WK712/2, Donaldson P550345, Hifi SN555.

• Ford Lehman / Sabre (Ford 2700-series): Mann WK940/6, Sierra 18-7853. Grade this row unverified.

Confirm before you order.

Notes

• Diesel primary vs secondary/water-separator filters are different parts. The numbers above are the on-engine fuel filter. A Racor-style primary separator uses a different part.
• Kubota fuel filter numbers supersede over time. An old number and its successor are the same filter.

Match thread and body size to your old filter. Don't mix the spin-on type with the element type. See Methodology. See also the oil filter chart.

Primary separator versus on-engine filter

The numbers in the tables are the on-engine fuel filter. That filter is a spin-on or an element on the Kubota block. A Racor, Volvo, or Nanni water-separator on the bulkhead is a different part. It has a different micron rating. Don't swap a 15221-43170 for a primary-separator element. 15221-43170 is the on-engine filter. The bulkhead separator does the water job. If you have both, you need both numbers.

The wrong choice can starve the engine or skip water separation.

Spin-on versus element

15221-43170 is a spin-on (M20×1.5, about 72 mm OD). 1G311-43380 is an element in a housing. Don't wrap tape around a thread to force a fit. 15521-43160 is a different adjacent Kubota spin-on (WIX 33507). Match the number on the old can exactly.

How to confirm before you order

1. Read the number stamped on the old filter. Then look up a marine box number if that is what you have.
2. Check thread and gasket against the new can.
3. If the marine brand printed its own number (Beta 211-60210), look that number up here.
4. Treat that row as an OEM member of the same cluster.
5. Then buy Kubota or WIX if you want the cheaper channel.
6. I've left Ford Lehman / Sabre rows at unverified until you have the can in hand.

Related: what you still buy as a marine part (the lift pump and some housings stay marine).

I pull these numbers from public catalogues and third-party lists. They can be wrong. Check against an official source before you order. Methodology · All guides.