Seachoice 50-21111 In-Line Fuel Filter – 5/16 in. | 20 Micron | Mercury / Johnson / Evinrude
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Seachoice 50-21111 – In-Line Fuel Filter | 5/16 in. Barb | 20 Micron
Part Number: 50-21111 | Reference: 21111
Brand: Seachoice
Type: In-Line Outboard Fuel Filter
Filtration: 20 Micron
Barb Size: 5/16 in.
Construction: Molded White Plastic
UPC: 719249211114
The Seachoice 50-21111 installs directly in the fuel line and filters contaminants to 20 microns before they reach carburetors or other downstream fuel-system components. Designed for selected Mercury, Johnson, and Evinrude outboard applications using 5/16-inch fuel-line connections. The white molded body allows easy visual inspection during maintenance.
Compatible Applications
- Mercury outboards using 5/16 in. in-line fuel filter – replaces 35-816296-1 and 35-16494
- Johnson/Evinrude outboards using 5/16 in. in-line fuel filter – replaces 398327
Fitment Notice: Confirm your existing fuel filter part number and fuel-line hose diameter before ordering. Seachoice offers this same 20-micron filter in 1/4 in. and 3/8 in. barb sizes — matching the hose diameter is critical for a leak-free installation.
When to Replace
Replace the fuel filter during routine fuel-system maintenance, or if you notice:
- Hard starting or rough running from restricted fuel flow
- Visible contamination or discoloration inside the filter body
- Cracking, leaking, or deterioration of the filter housing
Installation Notes
- Use properly sized 5/16 in. marine-rated fuel hose and appropriate clamps
- Install with the fuel-flow arrow pointing toward the engine
- Ensure both barb connections are fully seated and clamps are secure
- Inspect carefully for leaks before operating the engine
Cross-Reference Part Numbers
- Seachoice: 50-21111 / 21111
- Mercury: 35-816296-1
- Mercury: 35-16494
- Johnson/Evinrude: 398327
- UPC: 719249211114
Related Filters in This Series
- Seachoice 50-21101 – In-Line Fuel Filter, 1/4 in. | 20 Micron
- Seachoice 50-21121 – In-Line Fuel Filter, 3/8 in. | 20 Micron | Johnson/Evinrude
Parts Desk Insights
The quickest identifier in the Seachoice 20-micron in-line filter series is the barb size: this 50-21111 uses 5/16 in. connections, the 50-21101 uses 1/4 in., and the 50-21121 uses 3/8 in. The most common ordering mistake is selecting by engine brand alone without checking actual fuel-line diameter — measure the existing hose before purchasing. This filter is a straightforward maintenance item and a good first step any time a fuel delivery issue is being investigated on a Mercury, Johnson, or Evinrude outboard.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.