Why should I install a fuel water separator?

Water and debris in fuel are a leading cause of rough running, stalling, and injector or carburetor damage. A separator traps water and particles before they reach the engine, protecting the whole fuel system.

Where do you mount the separator and what size do I need?

We mount it in an accessible spot in the fuel line, sized to your engine's fuel flow so it does not starve the engine. We select the correct micron rating and capacity for your setup.

How often does the filter need changing after installation?

Typically once a season, or sooner if you take on bad fuel. On a diesel separator with a clear bowl, check for water before each trip and drain it from the petcock. Gasoline inboards and sterndrives need a fire-resistant metal bowl or canister in the engine compartment, so there you drain a little fuel from the bottom valve into a cup to check for water. We show you how, or you can leave it to us at service time.

Can you install one on any boat?

In almost all cases, yes. Gasoline and diesel engines both benefit, and we adapt the installation to your fuel line layout and available space.

Will a separator help with ethanol fuel problems?

It helps. A separator stops free water and dirt before they reach the engine. It cannot reverse phase separation: once E10 absorbs enough water, the water and ethanol drop out together and the remaining gasoline loses octane, so that fuel has to be pumped out. The best defense is fresh fuel and a stabilizer when the boat sits, with the separator protecting the engine.

How long does installation take?

Usually 1 to 2 hours of work. We route and secure the lines, check for leaks and prime the system so the engine is ready to run.

Fuel Water Separator Installation

Professional Fuel Water Separator Installation for Marine Engines. Protect your boat engine from water contamination and fuel impurities with expert fuel water separator installation. Ensure reliable performance and prevent costly fuel system damage.

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$150 /hr

Labor estimate Usually 1–2 hours

Book sends us a ticket; nothing is charged online. Before any work you get a written estimate for labor, parts and the trip fee, and nothing is done without your OK.

Trip fee By distance, one way: $30 in San Pedro, $50 in Long Beach

San Pedro$30
Wilmington, Terminal Island$40
Long Beach: Shoreline, Rainbow Harbor$50
Long Beach Marina, Alamitos Bay$60
Redondo Beach$60
Seal Beach, Huntington Harbour$75
Marina del Rey$85
Newport Beach$110

Farther away: $25 plus $2.50 a mile, one way from our San Pedro shop. No trip fee when the boat comes to our shop, or for plan members. The work of a visit is at least $150; the trip fee is on top.

Registered in California: Breeze Marine Boat Service LLC, San Pedro
Where we work: At your slip from Marina del Rey to Newport Beach, or in our San Pedro shop
Questions first: (213) 693-0224 or submit a ticket

About this service

Marine Fuel Systems

Clean Fuel.
Protected Engine.

Modern marine engines demand clean fuel. We install high-capacity Racor fuel filters and other quality fuel-water separators to stop water, sludge and debris before they reach your injectors. If the fuel in the tank has phase-separated, no filter can fix it; the fuel has to be removed.

Micron Filtration

We match the exact micron rating (2, 10, or 30-micron) required by your engine manufacturer. This stops microscopic rust and debris before it can clog your high-pressure fuel injectors.

Clear Sight Bowls

See the condition of your fuel at a glance. Racor Aquabloc media sheds water so it drops to the bottom of the clear bowl, where you drain it off with a simple petcock valve. Clear bowls are used on diesel installs and where the rules allow; in a gasoline engine compartment we fit a metal-bowl filter that meets USCG fuel-system rules.

Gas & Diesel Engineering

Whether battling ethanol issues and water in fuel on gas outboards or black algae in diesel inboards, we choose the correct flow-rate setup with marine-grade components that meet USCG fuel-system rules.

The Installation Process.

Engineered for reliability.

Flow Rate Calculation

We calculate the GPH (Gallons Per Hour) of your specific engine. An undersized boat fuel water separator can starve the engine of fuel at wide-open throttle and cause serious damage.

Strategic Mounting

The filter head is bolted in an accessible, low-vibration location away from exhaust heat. We leave enough clearance below the bowl so the element is easy to change, even out on the water.

Marine Plumbing

We exclusively use USCG Type A1-15 fire-rated fuel hoses and stainless steel or brass NPT fittings. We never use standard automotive or hardware store plumbing for your boat fuel lines.

Priming & Vacuum Test

After assembly, the entire system is manually primed to eliminate air locks. We vacuum test the connections to check for a leak-free draw from the tank to the engine.

System Components.

Uncompromising quality.

Turbine-style fuel water separators on an engine room bulkhead

Clear inspection bowl on a fuel water separator

Marine-rated fuel lines for the separator installation

Technical Specs.

Filtration standards.

Filtration Level 2, 10, or 30 Micron

Water Removal Free Water and Sludge

Hose Standard USCG Type A1-15

Common Questions

Why do I need this if my engine already has a filter?

The small engine-mounted marine fuel filter is your last line of defense. A primary bulk separator removes most of the free water and heavy sludge from the tank before it reaches the engine, so the engine-mounted filter does not clog as quickly.

How often should I drain the bowl?

Check it before every trip. On a clear bowl, if you see a distinct layer of water below the tinted fuel, place a cup underneath, open the petcock valve and drain the water out; on a metal bowl, drain a little fuel into a cup and look for water.

Protect Your Engine.

Schedule your fuel-water separator installation.

Book Installation

Outboard and Diesel Filter Setups

On gas outboards, the separator works as the primary outboard fuel filter, pulling water and debris out of the fuel before it reaches the smaller filter on the engine. On diesel inboards, it acts as the primary diesel fuel filter, catching water and sludge ahead of the finer engine-mounted element. In both cases the micron rating and flow capacity are matched to your engine.