How To Change Fuel Filter On Yamaha 50 Hp Two Stroke Outboard

What is ethanol and why is it then bad for marine engines?

Fuel Ethanol has been added to the majority of today'due south fuel supply as an oxygenate to help reduce emissions. It's also used to extend domestic fuel supplies.

Ethanol is alcohol, and booze is "hygroscopic," which means it attracts water molecules. Since nearly all boat fuel tanks are vented to the atmosphere, h2o tin (and will) collect in your fuel. When the concentration of water molecules in your fuel tank reaches just i⁄2 of one%, the h2o molecules volition bond with the alcohol and sink to the lesser, where your fuel option up is. Depending on the amount of water ingested into your outboard, this tin effect in everything from running issues to catastrophic damage.

fuel separator Ethanol, existence booze, is also a powerful solvent that can loosen debris in your fuel tank and all the tanks and lines it was in before it got to you. Once in your outboard, this droppings can cause everything from running bug to a no-start, no-run status. That's no fun.

Capt. George Mitchell on the importance of ethanol defense

What can I do to protect myself from the potentially damaging effects of ethanol?

Fortunately, there are simple procedures that can aid, but it's of import that yous do your part. This is one part of maintenance you must proactively do for yourself.

1.Install a 10-micron fuel/water separating filter in the fuel line between your fuel tank and your outboard. Information technology filters the gas and allows whatsoever h2o (which is heavier than gas) to safely sink to the bottom of the filter and out of the fuel. Yamaha's spin-on 10-micron filter traps impurities downward to 10 microns in size (one/20th of the diameter of a human hair), to keep your fuel make clean, and has an actress-large water-retentiveness area. And since it's a spin-on, information technology's very easy to replace.

Tip: Carefully filling a new replacement filter about 3⁄4 full with fresh, stabilized fuel before installation will make priming the fuel system subsequently much quicker and easier.

Tip: Apply a thin movie of make clean engine oil to the gasket when installing the filter. That will make it much easier to remove when it's time.

2. Add fuel stabilizer and conditioner to every tank of fuel. Make sure to add a quality, marine-specific not-alcohol-based formula, like Yamalube^® Fuel Stabilizer & Conditioner PLUS. These formulations are specifically designed to work effectively in the moisture-rich environments common to boats. And don't believe some of the claims you lot see today; no matter what you lot add together to bad gas, it's still bad gas. No condiment will restore stale fuel, remove water, or cure ethanol-related issues.

Tip: Today's gasoline can brainstorm to break downward in a matter of weeks, not months. Make sure to treat every tank of fuel, not simply for extended storage. It's cheap protection against a world of hurt.

3. Add Ring Costless PLUS internal engine cleaner to every tank of fuel. The cleansing additives in the majority of today's gas are a great start, simply they're formulated for automobiles, then they may non work as well on your outboard. Practice them one better. Band Free PLUS makes performance-robbing carbon chemically unable to stick to internal engine components. The "PLUS" is a proprietary blend of synthetic anti-corrosion additives that helps protect the "yellow metals" in your fuel system (copper, contumely and silver solder) from corrosion. These are key components to proper fuel system operation. This helps maintain their performance and reliability. Ring Free PLUS likewise cleans gums and deposits off of internal engine and fuel system components.

iv. Buy your gas where they sell a lot of it.
The goal is to keep your boat'due south fuel fresh and potent at all times. Why buy gas that's already been sitting around untreated? Buy the freshest fuel yous can discover, and at fill up, care for each tank with Yamalube Fuel Stabilizer & Conditioner PLUS and Ring Gratuitous PLUS. Add these before adding the fuel then they mix upward well. It's an easy, proactive and protective habit to go into.

Are at that place any other fuel filters, and where are they located?

Your Yamaha outboard has a system of fuel filters on the engine, as well. It's important to know the location of these filters and to clean or replace them at the recommended intervals. You tin find this information in your service manual or through your authorized Yamaha Marine dealer. As an example, here's a general guide using a modern Yamaha fuel-injected four stroke.

i. Principal On-Engine Filter. This is typically on the forepart, side, or rear of the powerhead, and is usually fabricated of plastic you can see through. It filters fuel coming into the outboard. This "primary" filter usually features a small water trap at the bottom of the cup. This is the kickoff filter after the 10-micron filter; so if in that location's water in here, it's time to change your x-micron. On Yamaha outboards, at that place may be a red ring visible within this filter. Don't e'er remove information technology. If it'southward floating, you've got water in this filter'due south trap. Time for a change.

2. Vapor Separator Tank (VST) Filter. Fastened to the electrical fuel pump in the Vapor Separator Tank (VST), this filters gas again simply before it'south pressurized into the fuel injection rail(south). The VST is a prime spot in your fuel system where deposits and mucilage tin grade, particularly if fuel is untreated, and the VST filter is the about hard to access and usually the almost expensive to replace. Aid protect it by consistently treating every tank of fuel, and regularly inspecting and servicing the get-go two filters in the fuel line.

3. In-Line Filter. Some models accept an in-line filter between the chief fuel pump and the VST (vapor separator tank) and/or in the fuel line betwixt the VST and the fuel rail, located forth the top of the outboard. Refer to your service transmission or contact your dealer for the verbal location for your model.

4. Fuel Injector Screen. These are built into each fuel injector. They're very fine-mesh screens and are not user-serviceable. If debris somehow makes it here, the fuel injectors must be removed and professionally cleaned, or replaced—reason enough to audit and/or change your fuel filters regularly.

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How often should I change my fuel filters?

Fuel/Water Separating Filter

10-micron filters should be replaced every fifty hours of engine operation. Keeping this filter clean and fresh will help protect the other fuel filters on the engine and extend their service life. And ever bear a spare on board, but in example you get a load of bad gas and the filter gets overwhelmed.

Tip: Do non simply remove and dump the fuel and re-install the filter, as captured debris and water could enter the "clean" side of the filter and exist released into your fuel system.

Principal and in-line filters should exist replaced after every 100 hours of engine operation. These are easy to get to and unproblematic to supercede.
VST filters should exist inspected and/or replaced after every 300 hours of engine operation, provided that the 10-micron external and initial on-engine filters have been serviced and maintained properly. Properly treated fuel will likewise extend the life of these filters.

What are some other tips I need to know nigh my fuel organization?

Yamalube

Check fuel system components before each trip. It's important to visually and physically check the condition of the fuel hoses and connections for whatsoever signs of leaks or peachy each time you utilise your boat. Give everything the "sniff exam". Y'all should also check your primer bulb. If the bulb does non become house when squeezed prior to starting the engine, check for a possible fuel system leak. If none, supervene upon the primer seedling.
Get rid of carbon and keep it out. Yamaha Internal Engine Cleaner is a dealer-just applied production that is the strongest and near constructive way to clean out carbon and other build-upwards from the inside of your outboard. Once done, be sure to use Ring Complimentary PLUS regularly to help continue information technology that way.
Carburetors demand love, too. Late-model carburetors run very lean, with very small-scale passages that can clog with mucilage and varnish. Apply Yamalube^® Carburetor Cleaner Dip full force, or diluted using warm, soapy water, to aid clean them upward.

Tip: Be certain to follow directions. If yours is a 2-stroke carburetor, don't immerse it in solvent for long periods of time; the special sealant used on information technology will be removed, resulting in damage and possible negative running bug.

Gas containers. Be certain to add Fuel Stabilizer & Conditioner PLUS and Band Free PLUS before filling them up, and go along them in a absurd, dark place if possible. Containers available through Yamaha feature a "Spill-Proof Spout" which shuts off automatically when the container reaches capacity. This helps preclude spills and helps them comply with emissions requirements.