Sierra 18-8084 8084 Connector, Mercury/Mariner

Upgrade Your Outboard's Fuel System with Reliable Performance

Nothing disrupts a day on the water like a faulty fuel connector causing leaks, hesitation, or outright engine failure. Boaters familiar with Mercury and Mariner outboards know these small components handle critical fuel flow under high pressure and vibration. The Sierra 18-8084 steps in as a precision-engineered solution, designed to restore seamless operation without the hassle of sourcing originals.

Crafted from marine-grade materials resistant to ethanol-blended fuels, corrosion, and UV exposure, this connector ensures long-term reliability in saltwater or freshwater environments. Its exact-fit design mirrors factory specifications, making it a go-to for DIY mechanics and professional technicians alike.

Perfect Fit for Mercury and Mariner Engines

This fuel connector slots directly into a wide range of Mercury and Mariner powerheads, from compact 4-strokes to robust V8s. It's engineered for models spanning decades, addressing wear from constant flexing of fuel lines during rough seas or trailering. Whether you're maintaining a classic two-stroke or a modern EFI setup, compatibility is straightforward—no modifications required.

• Seamless integration with OEM fuel lines and primer bulbs
• Handles high-flow demands for optimal throttle response
• Prevents air intrusion that leads to hard starts

Key Features That Set It Apart

Unlike generic hardware store fittings, the Sierra 18-8084 prioritizes boating-specific durability:

• Barbed Design: Secure grip on hoses prevents slippage under vibration.
• Corrosion-Resistant Brass Construction: Withstands electrolysis and galvanic action in bilge water.
• Precise Threading: Matches Mercury mounting points for leak-free seals.
• Ethanol Compatible: Resists swelling and cracking from modern pump gas.

Boat owners report fewer mid-run stalls and easier winterizations after swapping in this part, turning potential breakdowns into smooth cruises.

Simple Installation for Quick Turnarounds

Replacing a worn fuel connector takes under 30 minutes with basic tools. Here's a step-by-step guide tailored for outboard enthusiasts:

1. Relieve fuel system pressure by pinching the primer bulb and running the engine dry.
2. Disconnect the battery and remove the cowling for access.
3. Use hose clamps or pliers to gently twist off old hoses—avoid razor blades to prevent debris.
4. Unscrew the old connector and clean the mounting area with a wire brush.
5. Thread in the new Sierra 18-8084 hand-tight, then snug with a wrench (torque to spec if available).
6. Reattach hoses securely and test for leaks at idle.

Pro Tip: Apply a dab of marine grease to barbs for easier hose installation and future removal.

Troubleshoot Common Fuel Delivery Issues

Fuel connectors often fail silently, mimicking carburetor or filter problems. Watch for these symptoms:

• Intermittent bogging under load
• Fuel smell near the transom
• Primer bulb staying soft
• Stale gas residue around fittings

Inspect annually during service—proactive swaps like this extend engine life and boost resale value. Pair it with fresh fuel stabilizers for peak performance.

Why Boaters Trust Sierra for Marine Parts

Sierra has built a reputation among marinas and weekend warriors for parts that perform like OEM but fit budgets better. Backed by rigorous testing against Mercury standards, the 18-8084 delivers confidence on every outing. It's not just a connector; it's peace of mind for your propulsion system.