Fuel Filter – Fits Mercury/Mariner 30-60HP EFI FourStroke (Replaces 35-879884T)
Fuel Filter – Fits Mercury/Mariner 30-60HP EFI FourStroke (Replaces 35-879884T) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Fuel Filter – Fits Mercury/Mariner 30-60HP EFI FourStroke (Replaces...
Product Details
This is a replacement Fuel Filter – Fits Mercury/Mariner 30-60HP EFI FourStroke (Replaces 35-879884T), designed for Mercury/Mariner 30HP 3-cylinder and 40-60HP 4-cylinder EFI FourStroke outboard engines with serial numbers 0T409000 and higher. It provides essential 20-micron filtration to protect your engine's sensitive fuel injection system from contaminants.
It serves as a direct replacement for Mercury/Quicksilver part numbers 35-879884T and 879884T.
- Installs easily in the under-cowl position.
- Features a 20-micron filter element to trap water and debris.
- Translucent bowl allows for quick visual inspection of fuel quality.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Mercury/Quicksilver | 35-879884T |
| Mercury/Quicksilver | 879884T |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This filter fits specific serial number ranges for Mercury and Mariner EFI FourStroke outboards. Always verify your engine's serial number before ordering.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Mercury/Mariner | 30 EFI (3 Cylinder) | 30 | 4-Stroke | Serial #0T409000 through 1B226999; 1C109093 and up | 35-879884T | Under-cowl mounted |
| Mercury/Mariner | 40 EFI (3 Cylinder) | 40 | 4-Stroke | Serial #0T409000 through 1B344398; 1C000001 and above | 35-879884T | Under-cowl mounted |
| Mercury/Mariner | 40 EFI (4 Cylinder) | 40 | 4-Stroke | Serial #0T409000 through 1B344306; 1C000001 and above | 35-879884T | Under-cowl mounted |
| Mercury | 40 EFI JET (4 Cylinder) | 40 | 4-Stroke | Serial #1C051324 and up | 35-879884T | Under-cowl mounted |
| Mercury/Mariner | 50 EFI (4 Cylinder) | 50 | 4-Stroke | Serial #0T409000 through 1B344306; 1C000001 and up | 35-879884T | Under-cowl mounted |
| Mercury/Mariner | 60 EFI (4 Cylinder) | 60 | 4-Stroke | Serial #0T409000 through 1B344306; 1C000001 and up | 35-879884T | Under-cowl mounted |
Technical Specs
- Product Type
- Inline Fuel Filter
- Installation
- Under-cowl mounted
- Filtration Rating
- 20 micron
- Fuel Type
- Gasoline
- Connection
- Inline
- Housing Material
- Translucent plastic with metal components
- Housing Color
- Clear/translucent
- Dimensions
- 13.4" L x 8.0" W x 9.0" H
- Fitting Type
- Screw-on translucent bowl
- Other Technical Attributes
- Water and debris separating design
What’s in the Box
- 1 x Fuel Filter (35-879884T)
- 1 x Washer
Installation Notes
- Turn off the engine and allow it to cool completely. Ensure the work area is well-ventilated.
- Locate the fuel filter assembly under the engine cowl.
- Relieve fuel system pressure according to your engine manufacturer's service manual.
- Place a rag or suitable container under the filter to catch any spilled fuel.
- Carefully disconnect the fuel lines from the old filter. Note their orientation.
- Unscrew and remove the old filter bowl and element.
- Clean the filter housing and inspect it for any signs of damage or debris.
- Lightly lubricate the seal on the new filter with clean engine oil.
- Install the new filter and washer, tightening to the manufacturer's specified torque. Do not overtighten.
- Securely reconnect the fuel lines to the new filter.
- Prime the fuel system and carefully inspect for any leaks.
- Start the engine and check again for leaks before resuming normal operation.
Troubleshooting & FAQ
How do I confirm this filter fits my engine?
The most reliable way is to match your engine's serial number to the ranges listed in the 'Engine & Model Compatibility' table. This filter is specifically for Mercury/Mariner 30-60HP EFI FourStroke models with serial numbers 0T409000 and above.
What are common signs of a clogged fuel filter?
Symptoms of a failing filter include the engine bogging down under acceleration, stalling at idle, difficulty starting, or a general loss of performance. The translucent bowl also allows for visual inspection of water or debris accumulation.
What is the recommended replacement interval?
For optimal performance and engine protection, it's best practice to replace your fuel filter annually or every 100 hours of operation, whichever comes first. You should also replace it anytime you notice water in the bowl or significant performance issues.
What is the difference between this filter and the OEM part?
This is an aftermarket component designed to meet or exceed original equipment manufacturer specifications. It provides an identical fit and filtration performance (20 microns) to the OEM part but at a more competitive price point.
Is any special tool required for installation?
Basic hand tools, such as pliers for hose clamps and a filter wrench, are typically sufficient. The most important step is to safely relieve fuel pressure before starting, which may require a specific procedure outlined in your engine's service manual.
Can I clean and reuse my old filter?
No. Modern fuel filters are disposable and cannot be effectively cleaned. Attempting to clean one can damage the filter media and introduce contaminants into your fuel system, leading to engine damage. Always replace a clogged or old filter with a new one.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). It is built to OEM-level specifications with comparable materials. Our parts are manufactured in an ISO 9002 certified facility and are batch-inspected for quality and consistency.
Shipping speed & cost
We ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free for most regions; any available expedited options and their costs will be displayed at checkout.
Warranty & returns
This product is covered by a 1-year warranty against manufacturing defects under normal use. If you encounter any issues, please contact our support team with your order details. Returns are accepted within our standard window for items that are unused and in their 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.
Payment & Security
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