ethanol question

On Thu, 12 Jun 2008 11:46:58 GMT, "Dick" wrote:

Recently my gas station placed stickers on the pumps warning it could
contain up to 10% ethanol.

My ride is an experimental built in 1997 with a C-85 always run on mogas.

Quick research indicates 3 concerns:
1-loosens debris inside the fuel system affecting filters.
2-mixes more readily with water (hydroscopic) but can experience "phase
separation" during climbs causing water to overload filter/sediment bowls.
3-can deteriorate composites, rubbers and plastics causing leaks/breakages.


Leaning towards more frequent gascolator inspections for 1 and 3, but
unsure on overloading a sediment bowl....

I'm wondering how others are addressing these concerns.

Thanks, Dick


for the reasons you mention I run my O-200 on 100/130 avgas with
REM38E plugs.

you have more worries than you've identified.

bacterial contamination that is not often checked for in mogas.
(surface of water stuff)

UV deterioration of the fuel leading to waxy deposits settling out.

a lot of your carby seals are actually leather. add that to your list.

just bye the bye when I pulled apart a marvel schebler carby I was
using, between the inlet filter and the needle seat was a lot of
friable black gunk which is supposedly from mogas that was used
previously. it was causing fuel dribbles after shutdown.