Mercury – 5/16" (8mm) Fuel Line Assembly 8 Feet | Fuel System | Low-Permeation Gray Hose with Primer Bulb | 8M0061891

Overview
Every boater has had that one morning when the engine just does not want to wake up. You squeeze a tired old primer bulb, wonder if fuel is even getting to the motor, and feel the day slipping away before you ever leave the dock. Swapping to a proper Mercury Marine part like this fuel line assembly changes that story. The Mercury 8M0061891 fuel line assembly gives you a solid, confident feel every time you reach for the bulb. You will know fuel is moving, the hose is sound, and the engine is getting what it needs so you can focus on the wind, the chop, and where you want to go instead of what might be wrong.

Key Features

• Complete fuel line assembly designed to deliver clean, steady fuel to your outboard

• Eight foot hose length to span from tank to engine on a wide range of boat layouts

• Five sixteenth inch (eight millimeter) inside diameter fuel line for proper flow to most portable and midrange engines

• Integral inline primer bulb for quick, firm priming before cold starts or after the boat has been sitting

• Includes fuel line and connectors for older style twist type disconnects at the engine end

• Compatible with either bayonet or thread in fittings at the fuel tank end

• Low permeation gray hose helps limit fuel vapor loss and reduce the chance of vapor lock on hot days

Engine & Boat Compatibility

• Designed for Mercury outboards that use older twist style engine end fuel connectors

• Works with many portable and fixed tank setups using bayonet or thread in tank fittings

• Suitable for a wide range of small to mid sized fishing boats, runabouts, and aluminum skiffs

• A smart choice for pontoons, dinghies, and utility boats running single outboard installations

• Ideal for boaters looking to refresh aging fuel rigging with a genuine Mercury Marine part

Performance & Practical Benefits
On the water, a good fuel line feels almost invisible because it just works. With part number 8M0061891, the primer bulb stays firm and responsive, not mushy or cracked. A few squeezes and you can feel fuel moving, lines filling, and the engine ready to light. That means fewer long cranking sessions at the ramp and more quick, confident starts. Once you are running, the proper inside diameter and low permeation construction help keep fuel moving in a smooth, steady way instead of allowing hot spots and bubbles to form.

The gray hose is more than a styling choice. It helps reflect heat and reduce the chance of vapor lock when the boat bakes in the sun or sits in a hot driveway. The line remains flexible yet durable, so routing around corners and through rigging tubes feels easy without sharp kinks. Connectors click into place with a secure feel, so you are not wondering if a stiff wave will knock something loose. Over time, you will notice fewer fuel smells and a cleaner, more reliable setup feeding your engine.

Why Buy OEM
Fuel delivery is not the place to experiment with bargain pieces. A Mercury Marine part like this fuel line assembly is engineered around the flow needs and connector styles that Mercury outboards actually use. The hose material, wall thickness, and primer bulb design are all chosen to stand up to marine fuel, movement, and temperature swings.

Could you piece together a hose, a bulb, and a handful of fittings from a hardware bin? Sure. But you will spend more time guessing and still wonder if something is slightly off. With Mercury Marine part number 8M0061891, the design work has already been done for you. It is a practical, real world choice that trades mystery for predictable performance and long term peace of mind.

FAQ

Q1: Which engines does the Mercury 8M0061891 Fuel Line Assembly fit?
It fits many Mercury outboards that use the older twist style disconnect at the engine and a bayonet or thread in style fitting at the fuel tank. If your setup uses that combination, this fuel line assembly is a strong match.

Q2: What makes this different from aftermarket fuel line assemblies?
This assembly is a genuine Mercury Marine part, built with low permeation hose and a properly matched primer bulb and connectors. The dimensions and materials are selected for marine fuel and Mercury style fittings, not adapted from generic hardware.

Q3: How do I know if this is the correct replacement for my boat?
Compare your existing engine end connector to the twist style fitting and check your tank end for bayonet or threaded connections. If they match and you need an eight foot, five sixteenth inch fuel line, part number 8M0061891 is likely the right choice.

Q4: Can this be used in both saltwater and freshwater?
Yes. The fuel line assembly is suitable for boats run in saltwater or freshwater. Just follow good fuel storage and flushing practices for your engine and fuel system.

Q5: Is installation straightforward for most boat owners?
Most boaters who are comfortable working with basic clamps and fittings will find it simple. You disconnect the old line, route the new one cleanly, attach the connectors, and check for a tight, secure fit before priming and starting the engine.