Sierra 18-7775-1 Fuel / Water Separator Kit

Keep your boat's engine running smoothly on every outing with the Sierra 18-7775-1 Fuel/Water Separator Kit. Designed specifically for marine environments, this kit tackles one of the biggest threats to your fuel system: water contamination. Whether you're dealing with humid docks, rainy days on the water, or questionable fuel from remote marinas, this separator ensures clean, reliable power delivery to your inboard or outboard motor.

Why Water in Fuel is a Boater's Nightmare

Water sneaks into your gasoline through condensation in the tank, ethanol absorption from modern fuels, or simply from sloppy filling practices. Once inside, it emulsifies—mixing invisibly with the gas—and heads straight for your injectors or carburetors. The result? Hesitation during acceleration, rough idling, or complete failure mid-trip. This kit steps in early, separating that water before it causes chaos, saving you from costly repairs and spoiled adventures.

Unmatched Filtration Performance

• Water Removal: Captures over 98.8% of emulsified water, draining it away effortlessly.
• Particle Filtration: 10-micron media traps more than 90% of debris down to that size, protecting precision fuel components.
• High-Flow Design: Delivers up to 90 gallons per hour (GPH), perfect for twin-engine setups or performance outboards that demand constant fuel supply.

Boat owners rave about how this setup prevents the "fuel starvation" symptoms that plague high-performance rigs, especially in rough seas where fuel pickup gets sloshy.

Complete Kit for Easy Installation

Everything you need comes in the box: a sturdy mounting bracket, the high-efficiency filter element, and two precision brass pipe plugs (one 3/8-inch and one 1/4-inch). No hunting for extras at the marine store. Mount it inline between your tank and engine—typically in the bilge or near the fuel pump—for optimal gravity drainage of collected water. Most installs take under an hour with basic tools, and it's compatible with a wide range of gasoline engines from popular brands.

Pro Installation Tips

1. Position the separator as low as possible with the drain valve down for easy water purging.
2. Use marine-grade fuel line and clamps to handle vibration and ethanol blends.
3. Prime the system after install by cycling the bulb or electric pump until fuel flows clear.
4. Check the drain petcock weekly; a quick pull removes any separated water before it builds up.

Long-Term Maintenance for Peak Performance

Inspect the filter every 100 hours or annually, whichever comes first. Swap the element if you notice darker media or reduced flow—signs it's doing its job. In saltwater environments, rinse the bracket exterior regularly to fend off corrosion. Pair this with a fuel stabilizer during storage, and your system stays ready for spontaneous launches.

Real-World Reliability

Fishermen in the Gulf swear by it for handling E10 fuels that pull moisture like a sponge. Weekend cruisers on the Great Lakes use it to avoid winterization woes. Even tournament pros trust it for consistent throttle response under load. It's not just a filter; it's peace of mind on the water.