----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]----Anthony,
I used Amoco Ultimate for many years, with no problems, until the last fill
up.....the gasoilne smelled asphaltic/jet fuel like.....I paid no attention,
and had no problem until I left the airplane sitting for several months. On
checking the gascolater, I had a green substance in the tank drains and
gascolator..and a thick green growth on the underside of my fuel caps....
I sent samples to Amoco..they only responded, ????but did not/would not
analyze the green stuff....
I am now convinced the green stuff was algae...typically grows in jet fuel,
and is killed by additives in jet fuel.(Prist)..to prevent its growth. Leaded
Aviation fuel is also poisonious to the algae...(tetra ethyl lead ); so no
algae growth when using Av fuel.
And probably no problem if the fuel is used up pretty quickly, before the
algae has a chance to grow....
Gasoline , fuel oil, jet fuel, kerosene are all pumped thru the same
pipelines through- out the country from the refineries to
storage/distribution farms. The "plug" of contaminated fuel - that fuel that
is mixed at the interface of gasoline and fuel oil, for example, is removed
from the pipes and re-refined.
I think I got a dose of jet fuel, etc. that was not properly separated in the
transportation of the fuels to the storage tanks.
It took me several weeks to finally clean all the tanks, lines, etc.....and
now because I am still only using the coupe occassionally, I only use 100 LL
with Tetra Ethyl Lead, to kill any potential algae.....
Auto fuel again ?....I think so, but I will carefully notice the odor...no
asphaltic smells for me..., and probably mix with 100LL so as to keep the
algae growth controlled.
I drained my tanks, used 100 LL and Prist ( the additive used in Jet fuel to
kill algae), and still had a hard time getting a clean system.
Foolishly, I saved the gasoilne and put it in my autos ( before I realized
the potential algae problem). Algae likes copper......., and almost
immediately I lost both auto fuel guages...I quickly refueled one of them and
added prist; and the fuel guage again works. I left the fuel in the other too
long apparently, and now need to replace the tank unit...Could have been a
co-incidence, but same timing on both vehicles????
Now, all this is just my observation, and has not been scientifically checked
and verified. But if true, then the use of auto fuel or even unleaded
aviation fuel ( no poison to algae) may result in a problem. With the
development of unleaded av Fuel, a algacide may be needed, because it is
almost impossible to be sure the "plug of contaimnated fuel" is completely
clean.....
Best Regards,
Harry Francis
Blacksburg, VA.
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