In-Line Fuel Filter for Select Mercury/Mariner 4-Stroke Verado Outboards 135–275 HP – Replaces 35-879885Q, 35-879885T and 35-879885K
In-Line Fuel Filter for Select Mercury/Mariner 4-Stroke Verado Outboards 135–275 HP – Replaces 35-879885Q, 35-879885T and 35-879885K is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
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In-Line Fuel Filter for Select Mercury/Mariner 4-Stroke Verado Outb...
In-Line Fuel Filter for Select Mercury/Mariner 4-Stroke Verado Outboards 135–275 HP – Replaces 35-879885Q, 35-879885T and 35-879885K is backordered and will ship as soon as it is back in stock.
Product Details
This in-line fuel filter is an aftermarket replacement for select Mercury and Mariner 4-stroke Verado outboard fuel systems. Catalog references identify this filter style for 135, 150 and 175 HP Verado models with serial numbers beginning at 1B227000, 200 and 225 HP Verado models with serial numbers beginning at 0T980000, and 250 and 275 HP Verado models with serial numbers beginning at 0T801000. The filter uses a 5/16-inch fuel-line connection and is intended for under-cowl, in-line installation.
Use the original filter and your engine serial number to confirm application before ordering. The replacement references listed below are identification and interchange references; they do not replace the need to verify the complete engine model and serial-number range.
- In-line fuel filtration for select Mercury and Mariner 4-stroke Verado outboards.
- Designed for installation in the existing 5/16-inch fuel hose.
- Helps remove fuel-system contaminants before fuel reaches the engine.
- Aftermarket replacement; not manufactured or branded by Mercury Marine.
Part Number Matrix
Use these references to compare the filter with the part currently installed on your engine.
| Brand or source | Part number | Reference type |
|---|---|---|
| Mercury Marine | 35-879885Q | OEM replacement reference |
| Mercury Marine | 35-879885T | OEM replacement reference |
| Mercury Marine | 35-879885K | Replacement reference |
| Mercury Marine | 879885Q | Short-form reference |
| Sierra | 18-7718 | Aftermarket interchange reference |
Engine & Model Compatibility
The following applications are supported by cataloged part-number relationships. Mercury and Mariner fitment can depend on the complete engine serial number, model designation and fuel-system configuration.
| Brand | Model family | Rated HP | Stroke | Serial-number condition | Reference |
|---|---|---|---|---|---|
| Mercury / Mariner | Verado 4-Stroke | 135, 150, 175 | 4-Stroke | S/N 1B227000 and above | 35-879885T / Sierra 18-7718 |
| Mercury / Mariner | Verado 4-Stroke | 200, 225 | 4-Stroke | S/N 0T980000 and above | 35-879885T / Sierra 18-7718 |
| Mercury / Mariner | Verado 4-Stroke | 250, 275 | 4-Stroke | S/N 0T801000 and above | 35-879885T / Sierra 18-7718 |
| Mercury | 30–115 EFI and 150 4-Stroke applications | 30–115, 150 | 4-Stroke | Various serial-number ranges | 35-879885Q; verify the exact catalog application |
Important: Do not assume that every Mercury, Mariner or Verado outboard in the listed horsepower range uses the same filter. Confirm the OEM reference and serial-number range for your specific engine before purchase.
Technical Specifications
- Product type
- In-line fuel filter
- Application
- Select Mercury and Mariner 4-stroke outboard fuel systems
- Primary documented application
- Mercury/Mariner Verado 135–275 HP, subject to serial-number verification
- Connection size
- 5/16 inch fuel hose
- Installation location
- Under cowl, installed in-line with the fuel hose
- Brand status
- Aftermarket replacement; not a genuine Mercury Marine component
What's in the Box
- 1 × In-line fuel filter
Hose clamps, fuel hose, fittings and other service parts are not specified as included unless shown with the product.
Installation Notes
- Switch off the engine, allow it to cool and disconnect the battery according to the engine service procedure.
- Relieve fuel-system pressure as directed by the engine manufacturer's service information.
- Locate the existing in-line filter and place an absorbent cloth beneath the connection points.
- Before removing the old filter, note the direction of the fuel-flow arrow.
- Loosen the hose clamps and carefully remove the fuel lines from the old filter.
- Install the replacement filter with the flow arrow pointing in the same direction as the original.
- Push the fuel lines fully onto the filter connections and secure them with suitable clamps.
- Reconnect the battery, prime the fuel system according to the engine manual and inspect all connections for leaks before starting.
Troubleshooting & FAQ
How do I confirm fitment for my engine?
Compare the part number on your existing filter with the references in the matrix, then verify the complete engine model and serial number. Mercury and Mariner applications can change by serial-number range even when horsepower is the same.
Does this fit every Mercury or Mariner 4-stroke outboard?
No. The documented relationships cover specific applications and serial-number ranges. Do not use the broad horsepower range alone to determine fitment.
Is this an OEM Mercury filter?
No. This is an aftermarket replacement intended to replace the listed Mercury reference numbers. Mercury and Mariner are manufacturer trademarks used only to identify intended applications.
What symptoms may indicate a restricted fuel filter?
Possible symptoms include hard starting, hesitation, rough running, stalling or reduced power. These symptoms can also result from other fuel-system or engine problems, so diagnose the complete system before replacing parts.
How often should the filter be replaced?
Follow the maintenance schedule for your specific engine and replace the filter whenever it is contaminated, damaged or suspected to be restricted. Service intervals vary by engine, fuel condition and operating environment.
Are hose clamps or other installation parts included?
Only the in-line fuel filter is specified in the package contents. Reuse or replace clamps and other installation parts only when they are appropriate for the fuel system and in good condition.
Safety & Important Information
- Fuel is flammable. Work in a well-ventilated area away from sparks, flames and hot surfaces.
- Relieve fuel pressure and prevent spilled fuel from contacting hot engine components.
- Verify the filter shape, connection size, flow direction and part-number reference before installation.
- Professional installation is recommended if you are not familiar with marine fuel systems.
- This product is an aftermarket replacement and is not affiliated with or endorsed by Mercury Marine.
About Sea Sierra
- Marine replacement parts — Practical aftermarket components for repair and maintenance applications.
- Application-focused listings — Product references and fitment information are provided to help customers compare replacement parts.
- Support before ordering — When fitment is uncertain, provide the engine make, model, horsepower and complete serial number for verification.
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