Description
Upgraded S3213 Marine Fuel Water Separator — Replaceable Filter Element Design
The S3213 Fuel Water Separating Filter is the upgraded version of the classic marine fuel/water separator — now with a replaceable filter element that saves you money over the long run. Instead of throwing away the entire housing every service interval, simply swap the 10-micron filter cartridge and reuse the clear bowl. Designed for Mercury, Yamaha, Volvo Penta, and most outboard/inboard marine engines with 3/8" NPT fuel ports, this filter traps water, rust, and debris before they reach your injectors.
Fits: All marine engines using S3213/S3214/B32013-style spin-on fuel water separators with 3/8" NPT threads.
Key Features
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Replaceable Filter Element: Unlike traditional sealed S3213 filters, this version lets you replace only the 10-micron cartridge — keeping the clear bowl and reusing the housing. Lowers per-service cost by 50%+ compared to replacing the entire unit.
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10-Micron High-Efficiency Filtration: Removes 90%+ of particles as small as 10 microns. Protects sensitive fuel injection systems on modern outboard, sterndrive, and inboard engines.
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Clear Visual Inspection Bowl: Transparent nylon bowl lets you see accumulated water and sediment at a glance. Drain before water reaches the filter element — no guesswork.
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Universal 3/8" NPT Ports: Standard thread pattern fits virtually all marine fuel systems. Lower pressure drop than smaller port designs — maintains full fuel flow at WOT.
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Corrosion-Resistant Construction: Durable plastic housing with anti-oxidation coating. Designed for the harsh marine environment — salt spray, humidity, and temperature swings.
Compatibility — Replaces OEM Part Numbers
| OEM / Brand |
Part Number |
| Mercury Marine |
35-60494-1, 35-809097, 802893Q01 |
| Yamaha |
S3213, S3214 |
| Sierra |
18-7932-1, 18-7928-1, 18-7922, 18-7919 |
| Racor |
B32013, 120AT (spin-on type) |
| Volvo Penta |
Cross-compatible with most spin-on separators |
| Mallory |
9-37800 series |
Specifications
| Filter Type |
Replaceable element fuel water separator |
| Micron Rating |
10 micron (nominal) |
| Port Size |
3/8" NPT (female) |
| Bowl Material |
Clear nylon — visual water/sediment inspection |
| Housing Material |
High-impact polymer with anti-corrosion treatment |
| Includes |
Filter element + clear bowl (housing head sold separately or reuse existing) |
| SKU |
FJ-WSFF03-ZH |
Why Upgrade to the Replaceable Element Version?
The original S3213 is a sealed, one-piece design — when the filter clogs, you throw away the entire assembly. This upgraded version separates the filter element from the bowl:
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Lower long-term cost: Replacement cartridges cost as little as $6.33 each (3-pack). A traditional S3213 replacement costs $20-30 every time.
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Less waste: Only the filter media gets replaced — the bowl and housing are reused indefinitely.
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Faster service: Spin off the bowl, swap the element, spin it back on. No need to disconnect fuel lines.
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Better diagnostics: The clear bowl stays on the engine, so you can check for water accumulation between services.
🛒 Replacement Filter Cartridges
Single Replacement Cartridge
$10.00
10-micron element, fits this housing
Shop Now →
⭐ 3-Pack — Best Value
$19.00 ($6.33 each)
Save 37% vs buying 3 singles
Shop 3-Pack →
Frequently Asked Questions
Q: What's the difference between this and the standard S3213?
A: The standard S3213 is a sealed one-piece unit — you replace the entire filter every time. This upgraded version has a replaceable filter element: you keep the clear bowl and housing, and only swap the internal 10-micron cartridge. It costs less per service and produces less waste.
Q: Can I use this on my Mercury outboard?
A: Yes. This filter directly replaces Mercury Marine part numbers 35-60494-1, 35-809097, and 802893Q01. It fits all Mercury outboard and sterndrive engines using the standard 3/8" NPT spin-on filter mount.
Q: How often should I replace the filter element?
A: Replace every 100 hours or annually, whichever comes first. In high-humidity environments or if you use ethanol-blended fuel, check the clear bowl monthly and replace at 50-hour intervals if you see significant water accumulation.
Q: Does this include the mounting head/bracket?
A: No — this product includes the filter element and clear bowl only. It's designed to fit your existing S3213 mounting head (3/8" NPT). If you need a complete assembly with mounting bracket, see our bracket listing.
Q: Will this fit a Yamaha F150/F200/F250?
A: Yes, as long as your Yamaha uses the standard S3213/S3214-style spin-on filter head with 3/8" NPT threads. This covers most Yamaha 4-stroke outboards from 50HP to 350HP.
Q: How do I know when the filter needs replacing?
A: Three signs: (1) Clear bowl shows dark sediment or water layer — replace immediately. (2) Engine stumbles or loses power at WOT — restricted fuel flow. (3) Water-in-fuel alarm triggers — drain and replace element.
Q: Can I drain the water without replacing the filter?
A: Yes. The clear bowl has a drain at the bottom. But if water has reached the filter element itself, the media may be compromised — replace the cartridge. Draining only removes bulk water; it doesn't restore a saturated filter element.
