Sierra 18-8016S-1 Mercury Fuel Line, 8 ft 3/8 in
Sierra 18-8016S-1 Mercury Fuel Line, 8 ft 3/8 in — Product description
This is the Sierra 18-8016S-1 marine fuel line assembly, built for Mercury outboards. You get 8 feet of 3/8-inch fuel line with a double-sealed quick connect at the tank, a clip-on quick connect at the engine, plus a primer bulb and fuel connector already fitted. It's a clean drop-in replacement for a cracked or tired line.
A fuel line doesn't get much attention until it starts weeping at a fitting or the primer bulb goes soft and won't hold pressure. Then it's the only thing standing between you and a no-start at the ramp. This Sierra 18-8016S-1 assembly is the fix. It's a complete 8-foot fuel line built for Mercury outboards, and it shows up ready to run with the primer bulb and fuel connector already attached. No cutting hose, no hunting for the right barb, no guessing on clamp sizes.
The line is 3/8-inch inside diameter, the standard size for a wide range of small and mid-size Mercury outboards. The tank end uses a double-sealed quick connect, and the engine end is a clip-on quick connect that snaps onto the motor's fuel fitting. Both ends are keyed for their own job, so you won't cross them up. If you've swapped a fuel line before, you already know the drill. Pop the old one off, route the new one, and click both ends home.
Because it's a 3/8-inch line, it's dialed in for the fuel demand of smaller and mid-range outboards. Really big motors move a lot more fuel and typically want a larger line to feed them without starving at wide-open throttle. So check what your engine calls for. For the tiller and portable-tank crowd, and for plenty of console rigs running mid-size power, this is the right pipe for the job.
The primer bulb is the part you'll actually touch every time you launch. Squeeze it until it firms up and you've got fuel waiting at the engine, ready for that first crank. One thing worth knowing: primer bulbs live and die by sun exposure. On an open console the UV dries the rubber out and cracks it long before the line itself gives up. If you can route the bulb under a gunwale or tuck it out of direct sun when the boat's parked, it'll last a whole lot longer.
Routing matters more than people think. Keep the line away from the exhaust manifold and any hot metal. Heat softens fuel hose over time, and a soft line can collapse under suction and choke off the fuel supply. Give it a clean path with gentle bends, no kinks, and enough slack that the motor can turn lock to lock without tugging on either fitting. Measure your run before you order, too. Eight feet covers most transom-mounted tanks, but a walkaround with the tank way aft can eat that up fast.
Sierra builds this stuff to meet or exceed the original equipment it replaces, and they supply parts to OEM engine builders and boat builders every day. So you're getting a real marine-grade assembly, not a garden-hose special. If you run ethanol-blended pump gas, give the fittings and the bulb a quick look each spring. Ethanol is hard on rubber over the seasons, and a two-minute inspection beats a dead engine two miles out. If the bulb's check valve sticks after winter storage, a few firm squeezes usually frees it up.
One note on compliance. This is a non-EPA fuel line assembly, which matters more for how it's classified than how it performs on the water. It's the traditional-style line a lot of Mercury rigs were originally set up to run. If your boat came with this style of quick-connect fuel system, this drops right in.
Bottom line, this is an honest replacement fuel line for Mercury outboards that need a 3/8-inch feed. It's complete, it's ready to install, and it gets you back on the water without a trip to three different parts counters. Keep your old line in the dock box as a backup if it's still serviceable, and you're covered.
Key Features
- 8-foot overall length reaches most transom-mounted portable and built-in tanks without adding couplers.
- 3/8-inch inside diameter matches the fuel demand of small and mid-size Mercury outboards.
- Double-sealed quick connect at the tank end seals tight and pops off clean for storage or swapping tanks.
- Clip-on quick connect at the engine end snaps onto the motor's fuel fitting for a fast, tool-free hookup.
- Primer bulb included and pre-installed, so you can prime the fuel system before the first crank.
- Fuel connector included, making this a complete tank-to-engine assembly right out of the bag.
- Built by Sierra to meet or exceed the original equipment fuel line it replaces.
- Marine-grade construction stands up to fuel, sun, and the harsh saltwater environment.
Why Buy from NVN Marine
- Authorized Sierra Marine reseller, full manufacturer warranty
- NMEA member and ABYC certified, advice from real boat techs
- Same-day shipping before 3 PM ET on in-stock items
- NY headquarters and Fort Lauderdale flagship retail store
Technical specifications
| Title | Sierra 18-8016S-1 Fuel Line Assembly for Mercury Outboards, 8 ft |
|---|---|
| Brand | Sierra Marine |
| Manufacturer Part Number | 18-8016S-1 |
| UPC | 808282369576 |
| Application | Marine |
| Engine Compatibility | Mercury Outboard Engines |
| Length | 8 Feet |
| Inside Diameter | 3/8 Inch |
| Tank End Connector | Double Sealed Quick Connect |
| Engine End Connector | Clip-On Quick Connect |
| Primer Bulb | Included |
| Fuel Connector | Included |
| EPA Compliance | Non-EPA |
| Assembly Type | Fuel Line Assembly |
Frequently asked questions
Will this fuel line fit my Mercury outboard?
It's built for Mercury outboards that use the standard clip-on quick-connect fuel fitting paired with a 3/8-inch line. The engine end clips right onto that fitting and the tank end uses a double-sealed quick connect. If your rig currently runs this style of connector, it's a direct replacement.
How long is the fuel line, and what size is it?
The line is 8 feet long with a 3/8-inch inside diameter. That covers most transom-mounted tank setups. Measure your run before ordering, because a walkaround with the tank set well aft can use up 8 feet quickly.
Does it come with a primer bulb?
Yes. The primer bulb is included and already installed, along with the fuel connector. You squeeze the bulb until it firms up to prime the fuel system before the first crank. It's a complete tank-to-engine assembly out of the bag.
Is a 3/8-inch line big enough for my engine?
The 3/8-inch inside diameter suits the fuel demand of small and mid-size outboards. Larger, high-horsepower motors move a lot more fuel and often call for a bigger line to avoid starving at wide-open throttle. Check what your engine's manual specifies for fuel line size.
How do I keep the primer bulb from cracking?
Sun is the enemy. UV dries out the rubber on an open console and cracks the bulb long before the line wears out. Route the bulb under a gunwale or keep it out of direct sunlight when the boat's stored, and it'll last a lot longer.
Where should I route the fuel line in the boat?
Keep it away from the exhaust manifold and any hot metal. Heat softens fuel hose over time, and a soft line can collapse under suction and choke off fuel. Give it a clean path with gentle bends, no kinks, and enough slack for the motor to steer lock to lock.
Can I use this with ethanol-blended fuel?
It handles standard marine pump gas. If you run ethanol blends like E10, give the fittings and the bulb a quick look each spring, since ethanol is hard on rubber over the seasons. A two-minute inspection is cheap insurance against a fuel problem on the water.
Is this an EPA-compliant fuel line?
No, this is a non-EPA fuel line assembly. It's the traditional-style line many Mercury rigs were originally set up to use. If your boat came with this style of quick-connect fuel system, it drops right in.
The primer bulb feels stuck after winter. Is it bad?
Not necessarily. The check valve inside the bulb can stick after months of storage. A few firm squeezes usually frees it up and gets fuel flowing again. If it stays stuck or won't hold pressure, then it's time to look closer.
