This has been gone over pretty hard, but technically speaking, it is not the ethanol that separates from the gasoline, but the water phase, in which ethanol is more soluble than water. Thus the condensation of liquid water from alcohol blended Mogas preferentially absorbs the alcohol. For our purposes the effect is the same, an extra aqueous material in a separate phase in the fuel system,
VaCouper N3000G -- In [email protected], "fnelson913" <[EMAIL PROTECTED]> wrote: > > If ethanol is "completely soluble in motor gasoline" why does it have > a tendency to separate as it ages and as atmospheric changes occur? > The EAA notes this: Ethanol tends to develop "phase separation" as the > aircraft climbs, the resulting water (that was held by the ethanol) > could overwhelm fuel filters/sediment bowls. > > Those liquids that are truely soluble do not separate in this way. > > Frank Nelson > > --- In [email protected], "va_couper" <va_couper@> wrote: > > > > Ethanol is completely soluble in motor gasoline. There should be > zero > > concentration gradient if sufficient time and or energy has been > > expended to let the blend equilibrate. > > > > VaCouper > > N3000G > > >
