Sierra 18-7718 Inline Fuel Filter Mercury Verado 879885T 35-879885T
SM-18-7718
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Sierra 18-7718 Fuel Filter
8mm inline filter | Mercury Verado applications
The Sierra 18-7718 is an inline under-cowl fuel filter for selected Mercury and Mariner outboards. Its 8mm (5/16in) hose connections allow it to replace contaminated filters using the listed Mercury references, helping protect the engine fuel system.
Key Features
- ✔ Genuine Sierra-branded replacement filter
- ✔ Inline, non-spin-on configuration
- ✔ 8mm (5/16in) hose-tail connections
- ✔ Designed for selected Mercury and Mariner under-cowl installations
- ✔ Replaces listed 35-879885-series references
Technical Specs
| Brand | Sierra |
| Sierra part number | 18-7718 |
| Filter type | Inline fuel filter |
| Hose connection | 8mm (5/16in) |
| Spin-on | No |
| 4Boats SKU | SM-18-7718 |
Compatibility / Fitment Guide
Suitable for selected Mercury Verado FourStroke outboards, including listed 135/150/175HP models from serial 1B227000, 200/225HP models from serial 0T980000 and 250/275HP models from serial 0T801000. These ranges are guides taken from the current listing; always verify against the serial-number-specific Mercury parts catalogue.
Part Number Cross Reference
| Sierra | 18-7718 |
| Mercury / Quicksilver | 35-879885K; 35-879885Q; 35-879885T; 879885Q; 879885T |
| 4Boats SKU | SM-18-7718 |
Sierra 18-7718 is an aftermarket service replacement, not a Mercury or Quicksilver-branded component.
Questions & Answers
Is this a genuine Mercury filter?
No. It is a genuine Sierra filter supplied as an aftermarket replacement.
Will it fit every Verado outboard?
No. Check the original filter reference and engine serial number before ordering.
What hose size does it use?
The filter has 8mm (5/16in) hose-tail connections.
Is it a spin-on filter?
No. It is an inline filter installed in the fuel hose under the engine cowl.
Note: Clamp the fuel hoses securely, observe the correct installation orientation where marked and inspect for leaks before operating the boat.
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