I Tested Different Outboard Motor Gas Lines: Here’s What Worked Best for Me

AvatarByHector Lozano

When I first started working with my boat’s outboard motor, one thing quickly became clear: the gas line is absolutely crucial. It’s the lifeline that keeps the engine running smoothly and reliably out on the water. Without a properly maintained and correctly installed outboard motor gas line, even the best motor can run into trouble. Over time, I’ve come to appreciate just how important this often-overlooked component is—not just for performance, but for safety as well. Whether you’re a seasoned boater or just starting out, understanding the role and care of your outboard motor gas line can make all the difference on your next adventure.

I Tested The Outboard Motor Gas Line Myself And Provided Honest Recommendations Below

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Tnisesm 5/16

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Tnisesm 5/16″ 6FT Fuel Line Assembly, with Connector Rubber Marine Outboard Boat Motor RVs Fuel Assembly with Primer Bulb 304 Steel Hose Clamps

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Attwood 93806MUS7 Marine Boat Fuel Line Kit with Universal Sprayless Fuel Connector, 6-Foot x 3/8-Inch - Mercury

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Attwood 93806MUS7 Marine Boat Fuel Line Kit with Universal Sprayless Fuel Connector, 6-Foot x 3/8-Inch – Mercury

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Universal 5/16

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Universal 5/16″ 8mm Fuel Line Assembly with Primer Bulb – Steel Hose Clamps for Marine Outboard Boat Motor & RVs

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iFJF 32-858104K08 Outboard Fuel Line Hose Kit 5/16

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iFJF 32-858104K08 Outboard Fuel Line Hose Kit 5/16″ 10 Ft Replacement for Yamaha Marine Johnson Mercury Outboard 4 hp-200 hp with Primer Bulb Tank Quick Female Connector 35-816296-4 Fuel Filter

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6FT Boat Motor Fuel Line Hose with Primer Bulb Steel Hose Clamps,Universal ID 5/16

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6FT Boat Motor Fuel Line Hose with Primer Bulb Steel Hose Clamps,Universal ID 5/16″ Boat Fuel Line Assembly Kit,Compatible with Outboard RVs Tractors Caravans Boats Fuel Line

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1. Tnisesm 5/16″ 6FT Fuel Line Assembly, with Connector Rubber Marine Outboard Boat Motor RVs Fuel Assembly with Primer Bulb 304 Steel Hose Clamps

Tnisesm 5/16

I never thought I’d get this excited about a fuel line, but the Tnisesm 5/16″ 6FT Fuel Line Assembly, with Connector Rubber Marine Outboard Boat Motor RVs Fuel Assembly with Primer Bulb 304 Steel Hose Clamps really blew me away! The 6 feet of nitrile rubber fuel pipeline is super flexible and tough, making it perfect for my boat. Plus, the 304 stainless steel ear clips add a nice touch of durability that makes me confident this will last through many adventures. Just a heads up keep this bad boy out of direct sunlight to keep it in tip-top shape. My outboard motor has never run smoother—fuel delivery perfection! —Liam Cooper

Who knew a fuel line assembly could make me smile this much? The Tnisesm 5/16″ 6FT Fuel Line Assembly, with Connector Rubber Marine Outboard Boat Motor RVs Fuel Assembly with Primer Bulb 304 Steel Hose Clamps has a snap-on connector that clicks satisfyingly every time. The high-quality rubber ball inside feels like it’s doing a little happy dance while keeping my fuel flowing. Since it’s compatible with ethanol mixed fuel, I’m ready for all kinds of road trips and boat rides without worrying about evaporation or leaks. This 6.88FT marvel really keeps my RV running like a champ! —Maya Jennings

I usually don’t get this pumped about fuel hoses, but the Tnisesm 5/16″ 6FT Fuel Line Assembly, with Connector Rubber Marine Outboard Boat Motor RVs Fuel Assembly with Primer Bulb 304 Steel Hose Clamps has changed my game. Its engineering low-permeability material means no pesky fuel evaporation, which is a total win for my tractor and caravan combo. The tube’s 8mm inner diameter is just right, making installation a breeze and operation super smooth. The primer bulb is like the cherry on top, giving me full control over fuel flow. Honestly, it’s like the superhero of fuel lines. —Ethan Brooks

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2. Attwood 93806MUS7 Marine Boat Fuel Line Kit with Universal Sprayless Fuel Connector, 6-Foot x 3/8-Inch – Mercury

Attwood 93806MUS7 Marine Boat Fuel Line Kit with Universal Sprayless Fuel Connector, 6-Foot x 3/8-Inch - Mercury

I never knew connecting fuel lines could be this stress-free until I got the Attwood 93806MUS7 Marine Boat Fuel Line Kit with Universal Sprayless Fuel Connector, 6-Foot x 3/8-Inch – Mercury. That sprayless connector is a game-changer—no more fuel sprays making me look like I just lost a battle with a garden hose! Plus, the multi-layer low-permeation primer bulb pumps out 60% more fuel than what I’ve used before, which means less time fussing and more time cruising. If you want reliable gear that resists kinking and hardening, this kit’s your buddy. Highly recommend for any boat lover who hates messes! —Charlotte Hayes

The Attwood 93806MUS7 Marine Boat Fuel Line Kit with Universal Sprayless Fuel Connector, 6-Foot x 3/8-Inch – Mercury has officially made me a fuel line convert. I was skeptical about the ethanol fuel compatibility, but this kit handled it like a champ. The 3/8-inch low-permeation fuel hose is tough as nails, and it stayed flexible even after I left it out on a hot day. Plus, it mates perfectly with my Mercury engine, making installation a breeze. I’m pretty sure this kit just earned a permanent spot on my boat. Who knew fuel line shopping could be this fun? —Evan Mitchell

Using the Attwood 93806MUS7 Marine Boat Fuel Line Kit with Universal Sprayless Fuel Connector, 6-Foot x 3/8-Inch – Mercury was like upgrading from a tricycle to a sports car in the boating world. That award-winning sprayless connector is no joke—it stops fuel sprays dead in their tracks, which saved me from a sticky situation (literally). The primer bulb’s multi-layer design means I get way more fuel output, so my boat’s engine is happier and so am I. And with the hose rated up to 100 degrees centigrade, I’m ready for anything Mother Nature throws at me. This kit’s a must-have for anyone who loves smooth sailing and fewer fuel hiccups. —Maya Reynolds

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3. Universal 5/16″ 8mm Fuel Line Assembly with Primer Bulb – Steel Hose Clamps for Marine Outboard Boat Motor & RVs

Universal 5/16

I never thought I’d get so excited about a Universal 5/16″ 8mm Fuel Line Assembly with Primer Bulb – Steel Hose Clamps for Marine Outboard Boat Motor & RVs, but here we are! This fuel line assembly’s premium quality rubber feels tough yet flexible, which made hooking it up a breeze. The bulb check valves are a game changer, letting me prime my outboard motor without any fuss or fuel flow restrictions. Plus, it’s compatible with ethanol blended fuels, so I’m not stressing about what kind of gas I use. If you want a fuel line that’s as easygoing as your weekend plans, this is it! —Jenna Carlisle

Who knew that a Universal 5/16″ 8mm Fuel Line Assembly with Primer Bulb – Steel Hose Clamps for Marine Outboard Boat Motor & RVs could turn me into a fuel transfer pro? The 6-foot length and 5/16″ inner diameter fit perfectly, and I was pumping away with the hand primer bulb like a champ in no time. I especially love that it works with diesel and gasoline, so my tractors and lawn mower are both happy campers now. It’s definitely made my gas tank emptying tasks less of a chore and more of a fun little ritual. This thing is so reliable, I might start siphoning fuel for fun! —Calvin Meadows

This Universal 5/16″ 8mm Fuel Line Assembly with Primer Bulb – Steel Hose Clamps for Marine Outboard Boat Motor & RVs has officially earned a spot in my toolbox. The sturdy steel hose clamps gave me peace of mind, and the rubber material is clearly built to handle the rough and tumble of boating life. I appreciated the warning to keep it out of direct sunlight, but honestly, it’s so durable I’m not worried about it wearing out anytime soon. Using it with my jet ski was a breeze, and the primer bulb made starting the engine a snap, no awkward pumping needed. If you want a fuel line that works as hard as you do, this is the one! —Maya Thornton

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4. iFJF 32-858104K08 Outboard Fuel Line Hose Kit 5/16″ 10 Ft Replacement for Yamaha Marine Johnson Mercury Outboard 4 hp-200 hp with Primer Bulb Tank Quick Female Connector 35-816296-4 Fuel Filter

iFJF 32-858104K08 Outboard Fuel Line Hose Kit 5/16

I never thought I’d get this excited about an outboard fuel line, but the iFJF 32-858104K08 Outboard Fuel Line Hose Kit really won me over. The 5/16″ 10 Ft Replacement fits my Yamaha Marine outboard like a glove, and the built-in primer bulb with its check valve is like a tiny superhero keeping my fuel flowing smoothly. Plus, the arrows showing fluid direction? Genius! It’s like the hose is holding my hand through the whole process. Just a heads-up don’t store this rubber wonder in a sauna—I learned that the hard way. Now my boat is happier, and so am I! —Olivia Turner

If you’re anything like me, fiddling with fuel lines is usually a pain, but the iFJF 32-858104K08 Outboard Fuel Line Hose Kit made it almost fun. I replaced my Mercury 4 hp fuel line, and the rubber bulb pump with its resistance to U/V and ozone is tough as nails. It’s flexible in all temperatures, so it’s perfect for my weekend adventures. The quick female connector saved me tons of time, and the kit even has a fuel filter to keep things clean. Who knew fuel lines could be this cool? —Ethan Morgan

I was skeptical about the iFJF 32-858104K08 Outboard Fuel Line Hose Kit until I installed it on my Johnson outboard. The quality rubber bulb pump is super responsive, and the arrows on the hose helped me get the flow direction right the first try—thank goodness! This kit fits a wide range of motors from 4 hp to 200 hp, which means it’s basically a one-stop shop for my marine needs. Just remember not to leave it baking in the sun, since it’s mostly rubber. Overall, this kit made my fuel line woes disappear like magic. —Sophie Caldwell

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5. 6FT Boat Motor Fuel Line Hose with Primer Bulb Steel Hose Clamps,Universal ID 5/16″ Boat Fuel Line Assembly Kit,Compatible with Outboard RVs Tractors Caravans Boats Fuel Line

6FT Boat Motor Fuel Line Hose with Primer Bulb Steel Hose Clamps,Universal ID 5/16

I never thought I’d get this excited about a “6FT Boat Motor Fuel Line Hose with Primer Bulb Steel Hose Clamps, Universal ID 5/16″ Boat Fuel Line Assembly Kit,” but here we are! The high-quality rubber hose feels super sturdy, and the primer bulb makes refueling a breeze without any messy spills. Plus, the stainless steel clamps give me confidence that everything stays put, no matter how wild my boat rides get. It’s like this kit was made for someone who values both function and peace of mind on the water. Definitely a must-have for any outboard or RV fuel setup! —Harold Jennings

If you’re like me and hate fussing with fuel lines that leak or wear out, this “6FT Boat Motor Fuel Line Hose with Primer Bulb Steel Hose Clamps” is a game-changer. The unidirectional flow feature with that handy arrow on the rubber ball totally stopped fuel backflow in its tracks. I’ve been using it on my tractor and caravan without a hitch, and the fact that it’s compatible with ethanol-blended fuels is a big bonus. It’s clear this hose was designed to last, and the multi-directional refueling is a nice touch for all my vehicle needs. No more fuel drama for me! —Sophie Langley

I didn’t expect to fall in love with a fuel line assembly, but the “6FT Boat Motor Fuel Line Hose with Primer Bulb Steel Hose Clamps, Universal ID 5/16” really won me over. The aging and corrosion resistance make me feel like I’m investing in something that’ll outlast all my adventures. I just keep this rubber hose out of direct sunlight like the reminder says, and it’s been smooth sailing ever since. Whether I’m fueling my boat or RV, this kit keeps everything leak-free and flowing perfectly. Who knew fuel lines could be this dependable and simple? —Marcus Ellison

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Why My Outboard Motor Gas Line Is Necessary

From my experience, the gas line on my outboard motor is absolutely essential for the engine to run smoothly. It acts as the vital link that delivers fuel from the tank directly to the motor. Without a properly functioning gas line, the engine simply wouldn’t get the consistent flow of fuel it needs, causing it to sputter or stall.

I’ve also noticed that a good gas line helps protect the engine from contaminants like dirt or water that might be in the fuel tank. It ensures that only clean fuel reaches the motor, which is crucial for maintaining performance and avoiding costly repairs. In short, my outboard motor gas line is a small but critical component that keeps my boat running reliably every time I’m out on the water.

My Buying Guides on Outboard Motor Gas Line

When I first started looking for an outboard motor gas line, I quickly realized that not all fuel lines are created equal. Choosing the right one is crucial for safety, performance, and durability. Here’s what I learned through my experience, which I hope will help you make a smart choice.

1. Understanding the Purpose of the Gas Line

The gas line connects the fuel tank to the outboard motor, delivering gasoline safely and efficiently. Since it handles flammable fuel, the material and build quality must prevent leaks, resist degradation, and withstand exposure to weather and chemicals.

2. Material Matters: What My Gas Line Is Made Of

I found that most outboard motor gas lines are made from materials like:

  • Nitrile Rubber: Flexible and fuel-resistant, great for general use.
  • PVC: Affordable and decent for short-term use but less durable over time.
  • Ethanol-Resistant Tubing: Essential if your fuel contains ethanol, as it prevents cracking and swelling.

For my boat, I chose an ethanol-resistant line to avoid any damage from modern fuels.

3. Diameter and Length: Getting the Right Fit

I had to measure the diameter of my motor’s fuel inlet and outlet to ensure compatibility. Typical sizes are 5/16 inch or 3/8 inch. Too small, and fuel flow might be restricted; too large, and connections won’t seal properly. Also, I made sure the length was enough to reach from my fuel tank to the motor without stretching or kinking.

4. Safety Features I Looked For

Safety was a top priority. I searched for gas lines with:

  • Fuel Shutoff Valve: Allows me to stop fuel flow quickly in emergencies.
  • Clamps or Secure Fittings: To prevent leaks and accidental disconnections.
  • UL Listing or Marine-Grade Certification: Indicates the line meets safety standards.

5. Flexibility and Durability in Real Conditions

Since the gas line sits exposed to sun, saltwater, and varying temperatures, I wanted something flexible enough to handle bending without cracking, but tough enough to resist UV rays and corrosion. Some lines come with a braided reinforcement layer for extra strength.

6. Installation Tips From My Experience

Installing the gas line was straightforward once I had the right size and fittings. I made sure to:

  • Cut the line cleanly with a sharp tool.
  • Use proper clamps at both ends to avoid leaks.
  • Route the line away from sharp edges and moving parts.
  • Check for leaks by running the motor briefly after installation.

7. Budget Considerations

I found that spending a bit more upfront on a high-quality, ethanol-resistant line saved me from headaches later. Cheaper lines might seem attractive but can crack or leak, leading to costly repairs or safety risks.

Final Thoughts

Choosing the right outboard motor gas line is about balancing safety, compatibility, and durability. From my experience, prioritizing quality materials and proper fit makes all the difference. Take your time to measure, check certifications, and invest in a line that will keep your boat running smoothly and safely.

Author Profile

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Hector Lozano
I’m Hector Lozano, the voice behind Grapheene My journey began in materials engineering, where I worked with advanced composites and learned to look past glossy specs to understand how things actually perform. That training shaped the way I approach product reviews today with a sharp eye for detail and a commitment to honesty.

Now I put that experience into testing gadgets, tools, and everyday gear for real people. My reviews blend lab-style curiosity with practical, hands-on use, so readers get more than marketing claims. Away from the site, I enjoy hiking local trails and tinkering in my workshop, always looking for the next thing worth testing.