Five Oceans 1/4 in NPT Fuel Tank Connector for Mercury Post-1998 — Brass, Ethanol-Compatible

Brass 1/4" NPT male fuel-tank connector engineered to mate with post-1998 Mercury female fittings, providing a durable, low-permeation connection for outboard portable fuel systems.

This Five Oceans FO4409 connector replaces factory and aftermarket male fittings on portable marine fuel tanks and pairs specifically with Mercury (OE) female connectors (22-13563A6, 22-13563Q7, 22-13563T7) and compatible Five Oceans female parts. Built from brass and specified for 1/4" NPT tank threads, the part is suitable for ethanol-blended fuels and designed to minimize vapor loss and leaks. It’s a straightforward hardware swap that restores a secure clip-style connection between tank and engine fuel lines.

How does this connector match Mercury and Yamaha fittings?

The FO4409 uses the standard two-prong clip interface and 1/4" NPT tank thread common to many Mercury and Yamaha portable fuel systems since 1998. It reproduces the geometry and sealing behavior expected by those OE female connectors so the latch and flow align properly.

• Compatible with Mercury OE parts 22-13563A6, 22-13563Q7, 22-13563T7
• Works with Five Oceans female connector FO2900
• Standard two-prong clip style for reliable engagement
• 1/4" NPT tank thread fits most portable marine tanks

Will this fitting handle ethanol-blended fuel and prevent leaks?

Yes — the connector is brass with low-permeation materials where required, chosen to resist the swelling and degradation that can occur with ethanol blends. Proper installation and mating to undamaged female parts greatly reduce the risk of seepage and vapor escape.

• Brass body resists corrosion in marine environments
• Low-permeation sealing reduces fuel vapor loss
• Designed for ethanol-blend compatibility
• Clip-style retention minimizes accidental disengagement

How simple is it to install this tank connector?

Installation is a basic mechanical task: thread the 1/4" NPT fitting into a compatible tank outlet and engage the fuel-line female connector until the two-prong clip locks. Most owners can complete the swap with common hand tools in minutes, but inspect mating parts and replace aged lines or primer bulbs at the same time.

• Thread-in 1/4" NPT connection for portable tanks
• No special tools required for basic installation
• Replace worn primer bulbs and fuel lines when fitting
• Check clip engagement for secure connection after mounting

What boats and engines is this part suitable for?

This connector is intended for use on boats with portable tanks and outboard engines that accept the Mercury/Yamaha clip-style fuel interface introduced in 1998 and later. It’s a targeted replacement part for systems that originally used the referenced OE Mercury connectors.

• Designed for boats with portable outboard fuel tanks
• Compatible with many Mercury and Yamaha outboards (post-1998)
• Fits portable tank outlets using 1/4" NPT threads
• Useful for maintenance, repairs, and restoration projects

Who is this for: boat owners, marine technicians, and service shops needing a dependable replacement male fuel tank connector that mates with Mercury OE female fittings and Five Oceans female parts. If you’re restoring a portable fuel system, replacing a leaking connector, or upgrading worn fuel-line components, the FO4409 offers a straightforward, marine-rated option built with decades of Five Oceans product experience behind it.