In-Line Fuel Filter for Mercury/Mariner 30–400 HP EFI Outboards — Replaces 35-879885Q, 35-879885T and 35-879885K
In-Line Fuel Filter for Mercury/Mariner 30–400 HP EFI Outboards — 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
Orders are typically processed within 1–2 business days.
U.S. orders usually arrive within 6–15 days, depending on stock location and destination.
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In-Line Fuel Filter for Mercury/Mariner 30–400 HP EFI Outboards — R...
In-Line Fuel Filter for Mercury/Mariner 30–400 HP EFI Outboards — 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 designed for selected Mercury and Mariner EFI and FourStroke outboards, including certain Verado and Jet Drive applications. It installs under the engine cowl in the fuel line and is listed for selected 30–400 HP applications. Always verify the exact engine model, year, stroke, serial number and existing filter number before ordering.
This aftermarket replacement is listed for Mercury references 35-879885Q, 35-879885T, 35-879885K and 27-11471M, Sierra 18-7718, and selected Yamaha 6G1-13621 series references.
- In-line installation under the engine cowl.
- Listed filtration rating: 20–30 microns.
- Sonically sealed end caps.
- Suitable for gasoline and listed ethanol-blended fuel applications such as E10.
- Clear housing helps make fuel flow and visible contamination easier to inspect.
Part Number Matrix
Use the following references as a preliminary cross-reference only. Confirm the number and physical configuration of the filter removed from your engine before installation.
| Brand | Part Number |
|---|---|
| Mercury | 35-879885Q |
| Mercury | 35-879885T |
| Mercury | 35-879885K |
| Mercury | 27-11471M |
| Sierra | 18-7718 |
| Yamaha | 6G1-13621-A1-00 |
| Yamaha | 6G1-13621-00-00 |
| Aftermarket | AM6G1-13621-A1 |
Engine & Model Compatibility
The applications below are reference points rather than a substitute for checking the complete engine identification. Keep horsepower, stroke, model family, year and serial-number conditions together when confirming fitment.
Mercury and Mariner: Listed applications include selected FourStroke, EFI, Verado and Jet Drive models from the ranges shown below.
| Brand | Model | Rated HP | Stroke | Years or Serial Conditions | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Mercury | EFI FourStroke | 30, 40 | 4-Stroke | 1996 and newer | 35-879885Q/T/K | Under-cowl installation |
| Mercury | FourStroke, 996 cc | 40, 50, 60 | 4-Stroke | 1996 and newer | 35-879885Q/T/K | Listed 4-cylinder applications |
| Mercury | FourStroke, 1.7 L | 75–115 | 4-Stroke | S/N 1B366823–2B094995 | 35-879885Q/T/K | Verify serial number |
| Mercury | FourStroke, 2.1 L | 75–115 | 4-Stroke | S/N 2B094996 and above | 35-879885Q/T/K | Verify serial number |
| Mercury | EFI FourStroke | 150 | 4-Stroke | S/N 1B905505 and above | 35-879885Q/T/K | Verify serial number |
| Mercury | Verado | 135–300 | 4-Stroke | 2004 and newer | 35-879885Q/T/K | Verify model and serial number |
| Mercury | Verado Pro | 200–300 | 4-Stroke | 2004 and newer | 35-879885Q/T/K | Verify model and serial number |
| Mercury | Verado | 350–400 | 4-Stroke | 2004 and newer | 35-879885Q/T/K | Verify model and serial number |
| Mercury | EFI Jet Drive | 65, 80 | 4-Stroke | 1996 and newer | 35-879885Q/T/K | Jet Drive applications |
| Mariner | Selected outboards | 30–300 | 4-Stroke | 1996 and newer | 35-879885Q/T/K | Verify exact model and serial number |
Yamaha: The listed cross-reference includes selected 2-Stroke and 4-Stroke applications. Confirm the engine's existing OEM filter number and physical configuration before ordering.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | 6C, 6D, 6MH, 6CMH, 6DMH and 6TRV series | 2–90 | 2-Stroke | 1984 and newer | 6G1-13621-00-00 | Verify exact model and part number |
Technical Specifications
- Product Type
- In-line fuel filter
- Installation
- Under-cowl, in-line fuel-system installation
- Filtration Rating
- 20–30 microns
- Fuel Type
- Gasoline and listed ethanol-blended fuels, including E10
- Connection
- 8 mm fuel line
- Housing Material
- Translucent plastic
- Housing Color
- Clear
- Weight
- 0.08 kg (2.89 oz)
- Fitting Type
- Push-on barb connection
- Construction
- Sonically sealed end caps
- Warranty
- 1-year coverage against manufacturing defects for applicable aftermarket versions
What's in the Box
- 1 x in-line fuel filter
Installation Notes
- Turn off the engine and allow it to cool completely. Work in a well-ventilated area away from open flames, sparks and ignition sources.
- Locate the existing in-line fuel filter under the engine cowling.
- Place an absorbent shop towel or suitable container beneath the filter to catch spilled fuel.
- Before removal, note the direction of the fuel-flow arrow and the routing of the fuel hoses.
- Carefully loosen the clamps and disconnect the fuel hoses from both ends of the old filter.
- Remove the old filter from its bracket or mounting position.
- Install the replacement filter with the fuel-flow arrow pointing toward the engine.
- Attach the fuel hoses fully to the barbs and secure the clamps without overtightening.
- Prime the fuel system according to the engine manufacturer's instructions.
- Start the engine and inspect the filter, hoses and connections for fuel leakage before operating the boat.
Troubleshooting & FAQ
How often should I replace this fuel filter?
Replacement intervals vary by engine and operating conditions. Many applications are serviced annually or at approximately 100 operating hours, but the engine manufacturer's service manual takes priority.
What are the signs of a clogged or failing fuel filter?
Possible symptoms include hesitation, sputtering, difficult starting, rough idling, reduced power and stalling, particularly under load. A clear housing may also reveal sediment or debris.
Is this filter compatible with ethanol-blended fuels such as E10?
The listed construction is intended for gasoline and ethanol-blended fuel applications such as E10. Follow the fuel-system requirements and maintenance schedule specified for your engine.
How can I confirm fitment for my engine?
Start by comparing the filter installed on your engine with the Part Number Matrix. Then verify the brand, model family, horsepower, stroke, year and any applicable serial-number range. If any of these details do not match, consult the engine service manual or a qualified marine technician before ordering.
Is this an OEM filter?
No. This listing is for an aftermarket replacement intended to match the listed reference numbers and application details. It is not marketed as a genuine OEM component.
Does this filter include hoses, clamps or other installation hardware?
No. The package contains one in-line fuel filter only. Reuse existing hardware only if it is in suitable condition and compatible with the installation.
What are the shipping and return terms?
Typical transit is 5–15 days for standard worldwide shipping where available. Expedited options, delivery estimates and applicable return conditions are shown at checkout or in the store's current policies.
What warranty applies?
Applicable aftermarket versions are covered by a 1-year warranty against manufacturing defects under normal use. Contact support with your order details if a warranty issue occurs.
Safety & Important Information
- Fuel is flammable. Work only in a well-ventilated area with the engine off and away from flames, sparks and other ignition sources.
- Verify the part number, hose size, flow direction, physical dimensions and engine application before installation.
- Do not operate the engine if fuel leaks are present.
- This is an aftermarket replacement, not a genuine OEM component.
- Professional installation is recommended when the correct application or fuel-system procedure is uncertain.
About Sea Sierra
- Pro-Grade Standards — Marine replacement parts selected for dependable fit and service in real-world operating conditions.
- Fast Global Fulfillment — Standard delivery is available to most regions, with current options shown at checkout.
- Manufacturer-Direct Value — Competitive pricing with attention to materials and quality control.
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