Installing A Remote Fuel Filter - BoatUS Magazine More Than Just GasChoosing The Right FilterFuel Lines: Time For Replacement?Plan The InstallationKeep An Eye on ThingsThe alcohol content in most fuels is 10 percent. Ethanol is the alcohol that's used in gasoline, and ethanol attracts water. Fuel that sits in your boat's tank, especially if you don't use your boat for long periods of time, gathers condensation from temperature and humidity changes that occur every day. To have this water run through your engine's fuel system and then in its combustion chambers is never a good thingerbating the issue, electronic fuel injection (EFI) and direct fuel inje..See more on boatus Installing a Fuel/Water Separator | Boating Magazine Jan 12, 2011Six steps for safeguarding a fuel system. Installing a Fuel/Water Separator. Six steps for safeguarding a fuel system.