cwalton
Who has more fun!
Lifetime Member
Very good and interesting information!!i know this might cause some feathers to be ruffled... but here it goes. i used to work for a fuel tank supplier to the big 3 along with a handful of other OEM's. we did have special fuel pumps that would go into flex fuel vehicles that required all stainless steel to be used in pumps springs etc. keep in mind that flex fuel is E85 or 15% ethanol give or take on the mix and time of year. E90 or regular fuel only contains around 10% ethanol. Ethanol is not exactly the spawn of Satan when it comes to fuels. Case in point "moisture in fuel". People who run strictly ethanol free gasoline for longer periods of time and allow their machine to sit will often times experience rough running for short periods of time and extreme cases no starts. this is due to the hydrocarbon based fuel being hydrophobic. water separates and settles to the bottom of the tank where the fuel pump draws obviously water doesnt aid in combustion so you get rough running symptoms until which point the fuel begins to mix and you begin getting gasoline instead of water into the system. If you are one of these people who only uses ethanol free gas what will happen is over time the water content will become more and more. this is where ethanol comes in. ethanol will absorb water in the fuel tank and being an alcohol will burn. in short if you are going to run ethanol free gas all the time it would be beneficial to run a tank or regular gas through it every once and awhile.