Mercury – Quicksilver Inlet Needle | OEM Precision Fuel System Part | 803861

Overview

A small part can make a big difference in how your outboard runs. The Mercury Marine 803861 Quicksilver Inlet Needle keeps your carbureted Mercury or Mariner 10–25HP 2-stroke outboard running smooth and consistent by controlling fuel flow with exact precision. When the old needle starts to wear out, you’ll feel it — rough idle, flooding, or a motor that just doesn’t want to start right. Replacing it with this genuine Mercury part restores proper fuel control and gets your engine performing the way it should.

Key Features

• Purpose: Maintains steady fuel delivery inside the carburetor for smooth operation.
• Precision Fit: Machined to exact Mercury specs for proper sealing and flow control.
• Durability: Built to handle ethanol-blended fuels and resist corrosion.
• Performance: Helps prevent flooding, rough idling, and fuel starvation.
• Installation: Drops right in with no adjustments or modifications needed.

Engine & Boat Compatibility

• Fits Mercury and Mariner 2-stroke outboards rated between 10HP and 25HP
• For exact model confirmation, refer to your owner’s or service manual

Performance & Real-World Benefits

The 803861 inlet needle is one of those small parts that quietly does an important job. It regulates the amount of fuel flowing into the carburetor, keeping your mixture balanced and your engine running steady. When it wears out, you’ll notice performance issues — from a sputtering idle to hard starts or even flooding.

Swapping it out with this OEM replacement restores crisp throttle response and dependable operation. It’s made to Mercury’s standards, so you get the right fit, proper sealing, and long-lasting reliability in real-world marine conditions.

Why Choose Mercury OEM

With Mercury OEM, you’re getting the exact part designed for your engine — not a guesswork replacement. Aftermarket inlet needles can vary slightly in size or material hardness, which can lead to poor fuel metering or early wear.

Mercury’s genuine part is built from high-quality materials, designed for today’s ethanol fuels, and tested for the kind of vibration, pressure, and heat that outboards face daily. It’s the difference between a motor that runs fine and one that runs perfectly.

FAQ

Q1: What does this part actually do?
It controls fuel entering your carburetor, helping your engine maintain the right air-fuel mix.

Q2: What engines use it?
It fits Mercury and Mariner 10–25HP 2-stroke models. Check your manual for exact fitment.

Q3: What are the signs it needs replacing?
Hard starts, stalling, flooding, or poor throttle response.

Q4: Is this a complicated repair?
Not at all — it’s a simple, drop-in replacement typically done during a carburetor service.

Q5: Why stick with OEM?
Because Mercury’s precision machining ensures exact fit, proper fuel control, and long-term reliability — things aftermarket parts can’t always guarantee.