Description
879884T Cartridge Fuel Filter for Mercury Mariner Outboard Engines
The 879884T cartridge type fuel filter assembly is engineered for Mercury and Mariner 30HP to 60HP EFI 4-stroke outboard engines. Featuring advanced 20-micron filtration, this filter removes fuel-borne contaminants — dirt, rust particles and water moisture — keeping your outboard's injection system protected and running at peak power.
📋 Key Takeaways
- ✅ Direct OE Replacement: Replaces Mercury / Mariner part numbers 879884T and 35-879884T.
- ✅ Broad Fitment: Fits 30HP, 35HP, 40HP, 50HP and 60HP 3-cylinder and 4-cylinder EFI 4-stroke outboards.
- ✅ 20-Micron Protection: Advanced media blocks dirt, rust particles and water moisture before they reach the injection system.
- ✅ Leak-Resistant Seal: Precision-molded housing with a snug O-ring fit engineered to resist leaks.
- ✅ Tool-Free Installation: No special tools needed — swap it at the dock or in your garage.
Features & Benefits
| Feature |
Benefit (What It Means for You) |
| 20-Micron Filter Media |
Captures dirt, rust particles and water moisture before they reach high-pressure injectors, helping prevent hard starting, rough idling and power loss. |
| Water & Rust Removal |
Removes damaging fuel-borne contaminants that can rob performance and cause engine damage — cleaner fuel, longer engine life. |
| Precision-Molded Housing |
Snug O-ring fit engineered to resist leaks under fuel system pressure and engine vibration. |
| Tool-Free Installation |
No special tools required — service your outboard at the dock or in your home garage in minutes. |
| Factory Tested |
Every unit is air-leak and pressure tested for consistent quality you can rely on. |
Compatibility & Cross-Reference
Replaces OE Part Numbers:
| Interchange Part Number |
Brand |
| FJ-WSFF10 |
iFJF |
| 879884T |
Mercury / Mariner OE |
| 35-879884T |
Mercury / Mariner OE |
Common Applications:
- Mercury 30HP, 35HP, 40HP, 50HP and 60HP — 3-cylinder and 4-cylinder EFI 4-stroke outboards
- Mariner 30HP, 35HP, 40HP, 50HP and 60HP — 3-cylinder and 4-cylinder EFI 4-stroke outboards
Note: This filter is designed for EFI 4-stroke models. It is not compatible with 2-stroke carbureted engines — please verify your engine type before ordering.
Specifications
| Part Number |
FJ-WSFF10 (iFJF) |
| Replaces |
879884T / 35-879884T |
| Filter Type |
Cartridge Type Fuel Filter Assembly |
| Filtration Rating |
20 Micron |
| Application |
Mercury / Mariner 30-60HP EFI 4-stroke outboards |
| Installation |
Tool-free, hand-tighten |
| Package Includes |
1 × cartridge fuel filter assembly |
Why Choose iFJF Over the OE Dealership?
🛡️ 1-Year Warranty Included · 30-Day Easy Returns · Lifetime Support
Not satisfied? Return it. Fails prematurely? We'll replace it — no receipt-hoarding, no dealership runaround.
As a professional filter manufacturer with a CNAS certified laboratory, we design and build our products to strictly match — and often exceed — OE specifications. Every single unit undergoes rigorous quality verification:
- 🔬 Lab-Tested Performance: Validated for filtration efficiency, particle holding capacity and burst strength.
- 🔍 100% Leakage Control: Factory-tested under high pressure to ensure zero leakage.
- 🛡️ Premium Build Quality: Precision-molded housing with O-ring sealing for harsh marine environments.
- 💰 Factory-Direct Supply: Commercial-grade quality directly from the manufacturer, no middleman markup.
⭐ Parts in stock and ready to ship from our US warehouse.
Frequently Asked Questions
Q: Will this fit my Mercury 60HP 4-stroke outboard?
A: Yes. This filter is a direct replacement for Mercury and Mariner 30HP, 35HP, 40HP, 50HP and 60HP 3-cylinder and 4-cylinder EFI 4-stroke outboard engines, replacing part numbers 879884T and 35-879884T.
Q: Does this fuel filter remove water from the fuel?
A: Yes. The 20-micron filter media removes damaging fuel-borne contaminants including dirt, rust particles and water moisture that can rob performance and cause engine damage.
Q: Does this filter leak at the housing?
A: Every filter is dimensional-matched to the 879884T / 35-879884T specifications, with a precision-molded housing and snug O-ring seal engineered to resist leaks under fuel system pressure and engine vibration.
Q: Do I need special tools to install it?
A: No special tools are needed. It is a straightforward cartridge replacement that installs by hand, so you can service your outboard at the dock or in your home garage.
Q: What is the micron rating of this filter?
A: This filter uses 20-micron filtration media to remove dirt, rust particles and water moisture from the fuel supply.
Q: What are the installation steps?
- Ensure the engine is off and cool, and observe fuel safety precautions.
- Remove the old cartridge filter assembly by hand.
- Clean the mounting surface and check the O-ring area.
- Install the new cartridge and hand-tighten until snug. Do not over-tighten.
- Prime the fuel system, start the engine and check carefully for leaks.
Package Includes
- 1 × 879884T Cartridge Type Fuel Filter Assembly
Common Problems with OE/Aftermarket Fuel Filters — Solved by iFJF
We analyzed verified customer reviews of OE and aftermarket alternatives. Here's what outboard owners keep complaining about — and how we fixed it:
| ❌ What Owners Complain About |
|
✅ How iFJF Solved It |
"Cheap replacement filters leak at the housing."
— Common complaint in aftermarket reviews
|
→ |
Precision-molded housing with snug O-ring fit
Dimensional-matched to 879884T / 35-879884T and air-leak / pressure tested, engineered to resist leaks under fuel pressure and vibration.
|
"Not sure if it fits my Mercury outboard."
— Common concern in Q&A and reviews
|
→ |
Explicit fitment for 30-60HP EFI 4-stroke
Covers 30HP, 35HP, 40HP, 50HP and 60HP 3 & 4-cylinder EFI 4-stroke engines — verify your engine type against our Cross-Reference table.
|
"Aftermarket quality vs OEM — will it protect my engine?"
— Common concern in reviews
|
→ |
20-micron media + factory testing
Removes dirt, rust and water moisture; every unit air-leak and pressure tested. Factory-direct value at a fraction of dealership pricing.
|
🔎 We read the 1-star and 2-star reviews so you don't have to. Every iFJF product is engineered to solve the real problems owners actually face — not just match a spec sheet.
Factory Direct Supply & Wholesale — iFJF is a direct manufacturer of high-performance automotive and marine filtration products, backed by ISO 9001:2015 and IATF 16949:2016 quality management system certifications. Custom specifications and bulk orders are highly welcome. Contact us for exclusive dealer pricing and volume discounts.
Email: support@ifjf.com
