Mercury – Threaded Hose Barb | Fuel Line Fitting | Brass Construction | Part Number 89771Q2

Overview

When it comes to your fuel system, the little connections matter just as much as the big components. A threaded hose barb may not be the most glamorous part on your boat, but when it’s built right, you feel the difference in every clean start and every steady run. The Quicksilver 89771Q2 Threaded Hose Barb gives you that sense of security — the kind that comes from knowing your fuel line is tight, well-sealed, and delivering fuel the way your engine expects. Whether you’re topping off the portable tank before sunrise or running at cruising speed with the family onboard, a reliable fitting keeps everything moving smoothly.

Key Features

• Brass threaded hose barb fitting for fuel tanks and water-separating filter brackets
• 1/4-inch NPT thread designed to mate securely with tanks or mounting brackets
• 5/16-inch (8 mm) hose barb sized for standard fuel line inner diameter
• Compatible with gasoline fuel systems (not for diesel use)
• Built to Mercury Marine OEM specifications for fit and performance

Engine & Boat Compatibility

• Works with Mercury and Mariner outboard fuel systems using 5/16-inch fuel line
• Fits portable fuel tanks, under-cowl fuel plumbing, and water-separating filter brackets
• Compatible with small to mid-size outboards, including:
  • Pontoon rigs
  • Aluminum fishing boats
  • Center consoles
  • Runabouts
  • Trailerable family boats
• Suitable for MerCruiser sterndrive applications using 5/16-inch gasoline fuel line

Performance & Practical Benefits

A quality fuel connection feels solid the moment you clamp the hose in place. This Quicksilver fitting threads cleanly into a tank or bracket without the gritty, uneven bite you get from cheaper aftermarket parts. Once tightened, the brass body seals firmly, resisting vibration, temperature changes, and the constant flex of a boat underway. The hose slips onto the barb with a snug, confident grip, giving you a clean flow path from the tank to the engine.

Because this fitting is built specifically for gasoline systems, you get dependable performance without worrying about swelling, corrosion, or premature wear. Brass is naturally resistant to fuel exposure and moisture, making it ideal for marine use. It also holds a consistent shape under pressure, so your hose remains securely connected even when the chop picks up or you're maneuvering into a tight dock lane.

Replacing old fittings, cracked lines, or aging primer bulbs often restores smoother fuel delivery than you’d expect. A new hose barb can reduce air leaks, minimize fuel starvation, and help eliminate the small problems — hard starts, stumbling on acceleration, or inconsistent idle — that slowly creep into older fuel systems. It’s a simple upgrade that pays off immediately.

Why Buy OEM

There are plenty of inexpensive fittings out there, but few match Mercury’s precision. OEM fittings are cut, threaded, and sized to exact standards, ensuring a leak-free seal and long-term durability. Aftermarket pieces often fall short in thread quality, barb sizing, or material consistency, which can lead to loose connections, leaks, or premature corrosion. A genuine Quicksilver fitting gives you peace of mind and the reliability your engine deserves — the kind of practical, proven choice seasoned boaters always recommend.

FAQ

Q1: What fuel systems is this fitting designed for?

It's built for Mercury and Mariner gasoline fuel systems using a 5/16-inch fuel line and a 1/4-inch NPT thread.

Q2: Can this fitting be used with diesel?

No — it is intended for gasoline only.

Q3: How do I confirm this is the right hose barb for my setup?

Check your tank or bracket for 1/4-inch NPT threading and your fuel line for 5/16-inch inner diameter.

Q4: Is it suitable for saltwater use?

Yes — brass construction and OEM tolerances make it durable in marine environments.

Q5: Should I replace other components when installing this?

Mercury recommends replacing older primer bulbs or aged fuel lines at the same time for best performance.

• Supersessions
  22-897711, 22-897712, 22-89771Q1, 22-89771Q2, 22-89771Q2