A removed inline marine fuel filter can be difficult to identify once its label wears off. Start with the original engine brand, OE number and physical connection arrangement, then compare the Sierra MPN. These four examples have different 4-, 20-, 32- and 140-micron ratings; matching a micron value alone is not a reliable replacement method.
Three clues to a filter's original application
How to narrow down the original filter
- Photograph the removed filter's body, printed part number, end connections and installed position.
- Use the engine's OE number to cross-reference a Sierra part; filter colour alone is not enough.
- Confirm whether the original was an inline element or a separate fuel/water separator assembly.
- Compare the micron rating and physical mounting requirements; a different micron rating does not confirm interchangeability.
- Inspect hoses, seals and clamps for age or damage and check for leaks after a correctly specified replacement is installed.
Identify the Sierra filter MPN and OEM family
| Sierra part | Micron rating | Listed application | Identification reference |
|---|---|---|---|
| 18-7715 | 140 µm | Selected MerCruiser applications | Original filter dimensions and OE part required |
| 18-7981 | 4 µm | Specified Mercury/MerCruiser systems | Mercury 35-884380T / 35-8M0020349 references |
| 18-79905 | 32 µm | Specified Yamaha outboards | Yamaha 69J-24501-10-00 reference |
| 18-79908 | 20 µm | Specified Honda outboards | Honda 16911-ZY3-000 / 16911-ZY3-010 references |
Listed engine families are not a complete fitment chart. Confirm exact OEM number and engine model before installation.
Review the matching catalog filter photographs
Use these listings to compare the removed part against available photographs, then review condition and availability.
Related marine fuel parts
Need the fuel hose or primer-bulb assembly instead of a filter? Compare Sierra marine fuel-line connections.
UsedRVParts product viewing and pickup are by appointment in Kelowna; check the listing for condition and availability.