What can I do to prevent issues with E10 fuel?

Total prevention of issues may not be possible but there are steps you can take to minimize the occurrence and severity of the negative affects of E10 fuel:

  • If at all possible, do not use E10 fuel.
  • Ideally (before switching to E10 fuel) have your fuel tank completely drained to remove any accumulated water. As little as 500mls. of water can promote phase separation in 100L of E10 fuel. The result would be 10L of unusable ethanol and water mixture on the bottom of the tank.
  • If the tank can be completely drained, the internal surfaces should be mechanically cleaned to remove rust or aluminium oxides. Fuel polishing companies may be able to provide this specialized service.
  • Consider replacing the fuel tank in an older boat.
  • If your boat has fibreglass fuel tanks built prior to the early 1990’s, consult with your boat builder concerning E10 compatibility.
  • If unable to completely drain and clean your tank before switching to E10 fuel, add as much E10 fuel as possible to minimize the possibility of phase separation. Example: 500mls of water may cause phase separation in 100L of E10 but 500mls of water in 120L would be safe from phase separation.
  • Install a Yamaha 10-micron water separating/fuel filter between the boat’s fuel tank and the engine.
  • Change the 10-micron filter every 25 hours of use until there are no indications of excessive water and contaminates collecting in the filter. Normal filter changes are recommended every 50 hours of use.
  • Carry extra filters and change more frequently if there are indications the efficiency of the filter is rapidly diminishing due to excessive water and contaminates.
  • Buy brand name fuel.
  • Buy fuel from the same source if possible.
  • Buy fuel from stations that have newer, cleaner storage tanks.
  • Do not drain a used filter and reinstall. Contaminated fuel can enter the filtered side of the filter while draining.
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