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You are watching: How to change a fuel water separator filter

The goal of today’s guide is to teach you just how to adjust fuel water separator filter on your watercraft. We wouldn’t say that installing a fuel water separator is that challenging, however it may throw off most boaters, particularly those that are handling separators for the first time.

Below, we’ll have a look at what fuel water separators are, talk around their importance, and then carry out you through a step-by-step overview for fuel water separator outboard installation.

How to Install a Fuel Water Separator on an Outboard Choosing the Right Fuel Water Separator for Your Outboard Frequently Asked Questions

What is a Fuel Water Separator?

A fuel water separator is a piece of technology intfinished to filter out water from fuel prior to it reaches the engine.

Boat filter

Conventional fuel filters are not designed to trap a lot water – this task is perdeveloped by fuel water separators instead.

How carry out fuel water separators work? Well, at the incredibly basics, the process is as follows:

A pleated paper aspect separates water into big dropallows.The dropallows loss onto a water bowl at the bottom of the device.Small water particles that did survive the paper facet gain trapped by a layer of silicone-treated nylon and aobtain fall onto the water bowl.The trapped water is then discharged either manually or instantly, depending upon the separator style.

This is just how generally fuel water separators work-related – the precise water filtering process may differ from separator to separator.

Do I Need a Fuel Water Separator on My Boat?

The following question is as follows – perform you require a water fuel separator filter in your boat? And if you execute, why?

Well, water affects your boat engine in a bunch of negative ways:

Rust. Iron or steel surencounters that come right into contact through water are likely to rust. Aside from structurally damaging your motor, rust pwrite-ups may also obtain right into your fuel. As rust-filled fuel goes through the motor, the abrasion of rust particles might sevecount damages its components.Abrasion. Water has a lower viscosity than gasoline and does not lubricate engine components as well. In fact, water is a terrible lubricant. With that, increased water content in your fuel is going to rise wear inside the motor.Low watercraft performance. As a consequence of all the negative impacts of water, your boat might begin percreating badly. Amongst the feasible results are low RPMs, sluggish acceleration, and also not just.

Now, one point that you might be wondering around is exactly how water deserve to obtain inside the fuel.

In the US, gasoline includes about 10% ethanol. The objective of the added ethanol is to oxygenate the gasoline for even more reliable burning. This lowers egoals and also additionally perhaps renders your boat more fuel-effective.

The trouble through ethanol is that it attracts moisture from the neighboring air. This is particularly exacerbated as soon as your fuel tank is not full and has a lot of air inside.

Aside from this, water might gain inside your fuel in a bunch of various ways:

Moisture may soak into gasoline if it’s imappropriately stored.If your motor components aren’t effectively sealed, then water may obtain inside also.

With this in mind, a fuel water separator is a preventative measure that allows you to save your fuel system intact and also your engine percreating to its potential. can’t be loaded bereason JavaScript is disabled: INSTALLING FUEL/WATER SEPARATION FILTER | FRONT HATCH | FULL BOAT RESTORATION – PART 13 (
Installing Fuel/Water Separation Filter

How to Install a Fuel Water Separator on an Outboard

Now, let’s cover fuel water separator outboard installation.

Necessary Tools and Supplies

To install a fuel water separator on an outboard, you will certainly need the adhering to tools:


Drill through drill bits that are sized ideal for the mounting holes.Spanner (to install hose connectors and also blanks).Screwdriver.A container to capture fuel.Rags for post-installation cleanup.

In addition, you may need:

Ball valve or blanking plugs to isolate the separator.Fuel hoses for either end of the fuel water separator.Jubilee clips/clamps for the fuel hoses.

Step 1. Cut Off Electricity and Fuel Lines on Your Boat

Before founding any installation, you should cut off electrical power and also fuel lines on your watercraft. This is to protect against electrocution and leakage of fuel as you disattach your fuel lines to install the separator.

At this stage, you need to likewise determine which fuel hoses will need blanking.

NOTE: If you are installing the separator indoors, then you must also open all hatches to encertain great ventilation.

Tip 2. Prepare the Fuel Water Separator for Installation

Next off, unload your separator and also make certain that you have actually all the essential fittings. Once you make certain that whatever is tright here, you must assemble your fuel water separator.

The assembly process differs from separator to separator, so you must check out your unit’s instructions for more specific guidance.

You may also want to pre-fill your separator with fuel, though this is not necessary. Pre-filling enables you to disarea the air inside and also proccasion huge amounts of air from obtaining into your fuel system.

Step 3. Locate a Proper Spot for the Separator

Your fuel water separator have to be inserted in a visible and available place. This is so that you deserve to quickly inspect the separator for water, drain it, or relocation the filter as soon as necessary.

Your primer bulb need to be easily available too.

Additionally, the place of the separator must be clear of any type of moving hoses or cables that might rub against the separator.

Tip 4. Mark Installation Points and also Drill Mounting Holes

Mark the installation points for the separator. Place the separator versus the area and note the mounting holes through a pencil.

At this phase, you should likewise confirm that you have preferred a correct area for your fuel water separator.

The separator need to be oriented vertically, and its inlet and outlet fuel lines need to be positioned conveniently for you without any kinking. Aside from that, it should be inserted in the fuel line that goes to the engine, yet before any type of filters, primers, fuel pumps, or regulators.

Once you’ve noted the installation points, drill suitable holes for the fasteners you’ve favored.

Motor Boat Engine

Step 5. Install the Separator Alengthy via Valves and Hoses

Next, mount the fuel water separator.

If you will certainly be utilizing a round valve for safety and security, then install it on the inlet side. This will certainly enable you to easily block the circulation of fuel when you should replace the filter.You must smear a fuel sealant to the threaded section of the ball valve. Then, mount the round valve to the separator making use of a spanner.Next off, mount hose connectors to the separator, aget using a fuel sealant at the threads and a spanner to tighten the connectors.If there are any type of ports that need blanking, then either usage blanking plugs or added round valves.Place two clamps on each of your hoses utilizing jubilee clamps/clips.Make certain that your hose configuration complies with the separator’s arrow direction.Connect your hoses to the hose connectors you installed in step 3.Tighten all the jubilee clamps/clips.

Tip 6. Bleed the Fuel Water Separator

Bleed your fuel mechanism up to the engine. Then, connect the fuel hose to the engine. On an outboard, squeeze the primer bulb till it’s firm.

Tip 7. Perform Last Checks and Start the Engine

Before starting up your boat engine, make sure that tbelow are no visual leaks or fuel residue all over. Check the configuration last time to ensure that everything’s fine.

Finally, erected your water cooling system and also power the engine on.

Check for leaks in your fuel water separator configuration. If every little thing is fine, then you should next take your boat for a ride. Acceleprice up to wide-open up throttle and make certain that you are getting adequate fuel to the engine and that tright here are no leaks anywhere.

Choosing the Right Fuel Water Separator for Your Outboard

We imply that you research fuel water separators a bit even more yourself to make the best choice. We’ll still cover some basics listed below.

You need to be able to uncover a fuel water separator at regional marine stores or online retailers. A few virtual areas to buy from are:


To efficiently filter out water, your fuel water separator’s filtration device need to be capable of trapping 10-micron pshort articles.

Fuel Water Separator Form-Factors

Maritime fuel water separators are easily accessible in 2 form-determinants – standalone separators and also kits. Kits incorporate the separator plus mounting hardware. Unless you are sure that you have all the necessary hardware, go for a fuel water separator kit.

Single and Dual Naval Fuel Water Separators

Keep in mind that some fuel water separators are intended for two-tank or two-engine systems. You may usage such separators on single-tank/engine boats also, however you will certainly have to block off among the separator’s sections.

Typically, fuel water separator kits incorporate fittings and also blanking plugs to enable for single-tank/engine installation, yet you must always make sure prior to buying anypoint.

Bowl Material

Fuel water separators intfinished for outboards commonly have plastic bowls. If you are in search of an inboard fuel water separator, then make certain that you obtain one with a glass bowl. Glass bowls will certainly not melt in the occasion of a fire.

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You may go for a steel bowl too, yet these aren’t transparent and hence don’t allow you to visually inspect the bowl.