Cartridge Fuel Filter Assembly – Fits Mercury/Mariner 30-60 HP 4-Stroke Outboards (Replaces 35-879884T, 879884T)
Cartridge Fuel Filter Assembly – Fits Mercury/Mariner 30-60 HP 4-Stroke Outboards (Replaces 35-879884T, 879884T) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
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Cartridge Fuel Filter Assembly – Fits Mercury/Mariner 30-60 HP 4-St...
Product Details
This inline Cartridge Fuel Filter Assembly is designed for Mercury and Mariner 30-60 HP 4-stroke EFI outboards. It fits 3-cylinder and 4-cylinder models that feature a screw-on filter bowl mounted under the engine cowl, providing essential protection by filtering harmful contaminants from the fuel system.
It serves as a direct replacement for Mercury part numbers 35-879884T, 879884T, 35-898101T68, and Quicksilver 879884T.
- Installs inline under the engine cowl for easy access.
- Features a 20-micron filter element to trap small particles.
- Includes a translucent bowl for at-a-glance fuel inspection.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket brands.
| Brand | Part Number |
|---|---|
| Mercury | 35-879884T |
| Mercury | 879884T |
| Mercury | 35-898101T68 |
| Quicksilver | 879884T |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This assembly is specifically for certain Mercury and Mariner 4-stroke EFI outboards from 30 to 60 HP.
| Brand | Model | Rated HP | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|---|
| Mercury/Mariner | 3-cylinder EFI | 30 | 4-Stroke | 35-879884T | - |
| Mercury/Mariner | 3-cylinder EFI | 35 | 4-Stroke | 35-879884T | - |
| Mercury/Mariner | 3-cylinder EFI | 40 | 4-Stroke | 35-879884T | - |
| Mercury/Mariner | 4-cylinder EFI | 40 | 4-Stroke | 35-879884T | - |
| Mercury/Mariner | 4-cylinder EFI | 50 | 4-Stroke | 35-879884T | - |
| Mercury/Mariner | 4-cylinder EFI | 60 | 4-Stroke | 35-879884T | - |
| Mercury/Mariner | Formula 60 | 60 | 4-Stroke | 35-879884T | - |
| Mercury/Mariner | Jet 40 EFI | 40 | 4-Stroke | 35-879884T | - |
Technical Specs
- Product Type
- Inline Cartridge Fuel Filter Assembly
- Installation
- Under-cowl, inline
- Filtration Rating
- 20 micron
- Fuel Type
- Gasoline
- Connection
- Inline
- Housing Material
- Plastic with translucent bowl
- Housing Color
- Clear/Translucent bowl
- Dimensions
- 10 × 8 × 4 cm (3.9 × 3.1 × 1.6 inches)
- Weight
- 0.4 kg (0.88 lbs)
- Fitting Type
- Screw-on filter bowl
- Warranty
- 1 year (from certain retailers)
- Other Attributes
- Features a translucent bowl for visual inspection of fuel content and debris
What’s in the Box
- 1 x Cartridge Type Fuel Filter Assembly (879884T)
- 1 x Filter Element (Pre-installed in bowl)
- 1 x O-ring
Installation Notes
- Ensure the engine is off, cool, and trimmed down. Disconnect the battery.
- Place a fuel-absorbent rag or container under the existing filter assembly to catch any spills.
- Carefully disconnect the inlet and outlet fuel lines from the filter. Note their orientation.
- Unscrew and remove the old filter assembly from its mounting bracket.
- Unscrew the filter bowl, discard the old filter element, and clean the bowl.
- Install the new O-ring and filter element into the bowl.
- Screw the bowl onto the new filter housing until snug. Do not overtighten.
- Mount the new assembly and securely reconnect the fuel lines.
- Prime the fuel system using the primer bulb until firm.
- Reconnect the battery, start the engine, and carefully inspect the filter and connections for any leaks.
Troubleshooting & FAQ
How do I know if this filter fits my engine?
This filter is specifically intended for Mercury/Mariner 30-60 HP 4-stroke EFI models. The most reliable method is to match your existing part number to one listed in our Part Number Matrix (e.g., 35-879884T). Also, physically confirm your engine uses a screw-on filter bowl located under the cowl.
What is the purpose of the translucent bowl?
The clear bowl allows for quick visual inspection of the fuel passing through. You can easily spot water (which will separate and sink to the bottom) or significant debris, indicating potential fuel contamination issues that need to be addressed.
How often should I replace this fuel filter?
For optimal performance and engine protection, it is recommended to replace the fuel filter element annually or every 100 hours of operation, whichever comes first. Refer to your engine's service manual for specific maintenance intervals.
What are the signs of a clogged or failing fuel filter?
Common symptoms include engine hesitation, loss of power, difficulty starting, stalling at low speeds, and rough idling. If you notice these issues, a clogged fuel filter is a likely culprit and should be inspected.
Can this filter be used on 2-stroke models?
This assembly is specified for 4-stroke EFI outboards. While some online listings mention broader compatibility, we only guarantee fitment on the 4-stroke models listed in the compatibility table to ensure proper fuel flow and filtration.
My old filter bowl is black plastic. Can I use this clear one?
Yes, as long as the part number and engine application match. This assembly with a clear bowl is a direct supersession for older versions that may have had an opaque black bowl. The clear design is an upgrade for easier fuel monitoring.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
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