Identify Sierra Inline Marine Fuel Filters by MPN & Micron

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

1. Exact part numberCheck the filter body, engine parts list and an original-equipment reference. A Sierra number is stronger evidence than appearance alone.
2. Physical installationCompare the body and seals, inlet/outlet connections, mounting and available clearance. OEM-style elements may not use universal hose-barb dimensions.
3. Filtration specificationCheck the micron rating required by that engine's fuel system. A finer filter may cause problems if substituted without approval.
Do not select by micron number alone. For example, a 20-micron Honda-reference element is not a general replacement for a 20-micron filter from another engine brand. Consult your exact engine model and serial-number parts manual.

How to narrow down the original filter

  1. Photograph the removed filter's body, printed part number, end connections and installed position.
  2. Use the engine's OE number to cross-reference a Sierra part; filter colour alone is not enough.
  3. Confirm whether the original was an inline element or a separate fuel/water separator assembly.
  4. Compare the micron rating and physical mounting requirements; a different micron rating does not confirm interchangeability.
  5. 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.

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