Straight Talk Facts About E10 From Yamaha

Facts About E10 Fuel

As we continue to adapt to our changing environment, we must remain consistent in our efforts to remain knowledgeable about the proper maintenance procedures for boats and outboards. The introduction of E10 fuel in many states requires additional attention to outboard fuel systems and filters, and it is important to understand the following:

How does E10 Fuel Contribute to Fuel System Issues?

• Ethanol is a strong cleaner (solvent).
• Ethanol is hygroscopic, (i.e. it has a strong attraction to moisture).
• Ethanol produces less energy (BTU’s) than an equivalent unit of gasoline.
• E10 fuel’s usable life span may be less than the normal length of off-season boat storage.
• Ethanol will clean gum and varnish as well as surface corrosion from any surface it contacts in the boat fuel system as well as storage and transport tanks in the fuel distribution system.
• Ethanol will increase the amount of water accumulating in fuel tanks.
• Ethanol may dissolve plastic resins used to make some fiberglass tanks.

Why am I not having E10 issues with my car?

• Boat fuel system contamination from water is increased due to exposure to a high moisture environment.
• Typically boats sit unused for long periods during which the fuel degrades and adds more contamination to the fuel system.

Are Yamaha Outboards Compatible with E10 Fuel?

• All current models, as well as most motors built since the late 1980’s, have been designed with fuel system components that are tolerant to fresh fuel containing ethanol up to 10% (E10).
• Outboard fuel systems can still be affected by: water, dissolved gum, varnish, corrosion particles and dissolved resins that E10 fuel has cleaned from the distribution system and from boats’ fuel tanks.

Although total prevention of issues may not be possible, there are steps we can take to minimize the occurrence and severity of the negative effects of E10 fuel:

• If at all possible do not use E10 fuel and never use fuel with ethanol content higher than 10%.
• Ideally before switching to E10 fuel, have your fuel tank completely drained and cleaned to remove any accumulated water, built-up varnish and corrosion.
• Install a Yamaha 10 Micron Fuel/Water Separating Filter between the boat’s fuel tank and the engine.
• Change the 10 Micron filter every 25 hours of operation until there are no indications of excessive water and contaminates collecting in the filter.
• Normal filter changes are recommended every 50 hours of operation.
• Buy name brand fuel and if possible from the same station.
• Regularly add Yamaha Fuel Stabilizer to fresh fuel to retard fuel aging.
• Stabilize fresh fuel before storing.
• Consult local dealers concerning maintenance procedures and new market developments.

As we continue to work through the issues surrounding E10 fuel, we must remember that proper maintenance of fuel systems and filters is it vital to the successful operation of our outboards. Taking these necessary steps is also critical role in keeping us safe on the water, enjoying our boating experiences.

The Yamaha 10 Micron Fuel/Water Separating Filter

Yamaha’s new, improved 10 Micron Filter provides superior filtration ahead of the engine’s onboard filters and injectors, reducing the negative effects of E10 fuel on the engine. A large filtering and water capture area maximize filtration while maintaining an adequate flow rate. These filters are highly recommended for all two-stroke and four-stroke EFI outboards as well as two-stroke HPDIs. The 10 Micron Filter is also an excellent match for carbureted engines. For more information or to place an order for the Yamaha 10 Micron Filter, please call or visit your local Yamaha dealership.