Attwood Marine Mercury Fuel Line Kit, 3/8 in x 6 ft, Universal Sprayless Connector

Overview

The Attwood Marine Mercury Fuel Line Kit is a 6-foot, 3/8-inch outboard fuel line assembly for connecting a portable marine fuel tank to compatible Mercury and Mercury-Mariner engines. It uses a low-permeation fuel hose, a multi-layer low-permeation primer bulb, and tank-side Universal Sprayless Connector hardware to support cleaner handling at the tank connection.

This kit is made for above-deck portable fuel systems where hose flexibility, fuel compatibility, and correct engine-end fit all matter. The hose is rated up to 100 C and is compatible with ethanol-blended fuel, which makes it a practical replacement line for many trailer boats, fishing boats, tenders, and small cruising boats running portable tanks.

The available configurations cover pre-1998 Mercury connections, 1998 and newer Mercury or Mercury-Mariner connections, and a version with a Fuel Demand Valve for systems that need controlled pressurized fuel flow.

Key features

• 6-foot fuel line with 3/8-inch inside diameter for common portable tank-to-outboard layouts.
• Low-permeation, fiber-reinforced fuel hose rated up to 100 C and compatible with ethanol-blended fuel.
• Multi-layer low-permeation primer bulb that resists collapse and ballooning during priming.
• Universal Sprayless Connector helps reduce fuel spray when connecting or disconnecting pressurized fuel lines at the tank.
• Tank-side connector fits standard 1/4-inch NPT marine fuel tank outlets and uses pre-applied fuel-compatible thread sealant.
• Variant range covers pre-1998 Mercury, 1998 and newer Mercury or Mercury-Mariner, and a Fuel Demand Valve configuration.

Variants

This parent item covers three Attwood Mercury fuel line configurations. Each version is built around the same 6-foot length and 3/8-inch hose diameter, but the engine connection and Fuel Demand Valve option change by configuration.

The tank-side setup uses the Universal Sprayless Connector format across the range. The main fit decision is whether the outboard connection is for pre-1998 Mercury engines, 1998 and newer Mercury or Mercury-Mariner engines, or a system that calls for the Fuel Demand Valve version.

• 93806MUS7: For 1998 & newer Mercury or Mercury-Mariner outboards. This is the standard later-style Mercury configuration and does not include the Fuel Demand Valve.
• 93806MUSD7: For Fuel Demand Valve. This version adds an in-line Fuel Demand Valve to control pressurized fuel flow before it reaches the engine.
• 93806AUS7: For Pre-1998 Mercury outboards. This version matches older Mercury fuel connections while keeping the same 6-foot hose length and 3/8-inch hose diameter used across this group.

Installation and fit

Match the engine-end connector to the outboard generation before installation, since Mercury fuel fittings changed over time. The tank end is intended for portable marine fuel tanks with a standard 1/4-inch NPT outlet, and the sprayless connector helps keep fuel contained when the line is connected or removed under tank pressure.

During installation, route the hose so it is not pinched by the transom, seat base, hatch, or battery compartment cover. Keep it away from sharp edges, hot engine surfaces, and tight bends that can restrict fuel flow or shorten hose life. The primer bulb should remain accessible so it can be squeezed before starting and checked easily during normal pre-run inspection.

Use on board

This kit fits portable-tank outboard setups where a clean tank connection and the correct Mercury engine fitting are the main concerns. It is a good match for small powerboats, aluminum fishing boats, inflatables, tenders, and backup portable tank arrangements used around the dock or on short coastal runs.

For boats that sit in the sun or run ethanol-blended fuel, the low-permeation hose and multi-layer primer bulb are useful details. They help the fuel line stay functional through regular seasonal use while reducing common problems such as hose hardening, bulb collapse, and fuel spray at the tank fitting.

Maintenance and care

Inspect the hose, primer bulb, clamps, and fittings as part of normal fuel-system checks. Replace the assembly if the hose becomes cracked, swollen, stiff, abraded, or if the primer bulb no longer firms up during priming.

After use, keep the line out of standing water and avoid storing it under heavy gear where the hose can be flattened. A clean connection at the tank and engine helps reduce starting trouble, fuel odor, and unnecessary strain on the outboard fuel system.