Mercury – Fuel Line Coupler | Fuel System Component | Cast Aluminum | 30635T3

Overview

When it comes to older Mercury and Mariner outboards, a good fuel connection means dependable performance. The Mercury Marine 30635T3 Fuel Line Coupler is built for TwoStroke engines from 1971 and earlier, giving you a reliable, tight connection between your portable fuel tank hose and the motor. Its twist-lock design makes attachment quick and secure, while the cast aluminum construction holds up against salt, fuel, and vibration. It’s a small but essential part that keeps your classic outboard running the way it should — smooth, clean, and consistent.

Key Features

• Purpose: Connects your portable fuel tank hose to vintage Mercury or Mariner outboards.
• Material: Constructed from cast aluminum, strong enough to resist corrosion and daily wear.
• Design: Twist-lock coupler provides a firm, leak-free seal and simple operation.
• Fitment: Includes a threaded fuel line end fitting that screws into the connector body.
• Performance: Keeps steady fuel flow for easier starts and smooth throttle response.
• Compatibility: Fits Mercury and Mariner TwoStroke outboards (1971 and older) except 3.9–9.8HP models.

Engine & Boat Compatibility

• Designed for vintage Mercury and Mariner TwoStroke outboards built in 1971 or earlier.
• Not compatible with Mercury 3.9–9.8HP engines.
• Perfect for classic aluminum fishing boats, small skiffs, and utility runabouts.
• Performs reliably in freshwater and saltwater conditions.

Performance & Practical Benefits

The 30635T3 coupler ensures a steady, air-free flow of fuel to your engine. The twist-lock fitting snaps in securely and stays put, preventing leaks and keeping pressure stable. Its cast aluminum body is tough enough to handle the marine environment and won’t rust or seize over time.

This connector makes fuel system maintenance simple and dependable — just lock it in, prime your line, and you’re ready to go. It’s a small upgrade that brings confidence back to every pull of the starter cord.

Why Buy OEM

Older outboards were built with precision, and their replacement parts should be too. The Mercury 30635T3 is a genuine Mercury Marine part, crafted to match the original fit and finish of vintage Mercury and Mariner connectors. Aftermarket couplers can feel loose, leak under pressure, or corrode prematurely.

Mercury’s OEM design ensures a proper seal, correct thread pitch, and long-lasting performance. It’s the right part to keep your classic engine running just as reliably as it did decades ago.

FAQ

Q1: Which engines does this fuel line coupler fit?
It fits 1971 and older Mercury and Mariner TwoStroke outboards, excluding 3.9–9.8HP models.

Q2: What’s it made from?
It’s made from marine-grade cast aluminum for strength and corrosion resistance.

Q3: Is the fuel line end fitting included?
Yes — the threaded end fitting is built into the connector.

Q4: Can it be used in saltwater?
Absolutely. The aluminum body resists corrosion and holds its seal in any environment.

Q5: Why choose an OEM Mercury connector?
OEM parts guarantee a precise fit and long service life, ensuring your vintage outboard stays reliable and leak-free.