Before you guys/gals go playing with all different "brands" of clear line
you had better decide which fuel you are going to use and STICK WITH IT
(unless filling with something else is the only way you can get home)! When
I was refurbishing C-FOKM, I removed all the rock solid sight gauge tubing
when I relocated the lower sight gauge fitting, after removing it from the
main outlet line and replaced them including a new cross vent tube. I soaked
numerous different types of readily available (read Home hardware, CTC etc)
tubing in 100LL and Premium Autofuel. The "skidoo" fuel line stuff
immediately yellows and turns hard (I'm talking minutes!) in 100LL (thanks
to the toluene), but stays soft and pliable in Auto fuel. The potable water
PVC stuff from H Hardware hardened/turned grey in Autofuel very quickly, but
seemed to stay pretty good (not great) with 100LL so that's what I used. It
is probably going to go hard also over time, but it was the best of locally
available items that can be easily replaced the same day, with no wait from
a supplier in California or similar. I don't think any of the hose available
is going to stand up to those of you that run what every pump you happen to
pull up to, inside the fence or outside (although they don't let you do that
at Drummond Island anymore do they Bob!). Also no guarantee that you will
actually get the fuel you are paying for either, as I got bad 100LL in
Escanaba Michigan on the way to OSH in 1995. It was cut with alcohol and who
knows what else!! Aircraft running Autofuel also usually rot the feed line
from the gascolator to the carb much quicker than when running AV gas. This
can be a neglected item as it is not readily "inspectable" thanks to the
manditory requirement of the MDRA program to hide that line under
firesleeve.
Bob had a bad experience with 80/87 from ----ond, but I kept my 500 gallon
tank filled with their product from 1994 to 1999 and couldn't have used a
better product. Excellent engine running, no lead build up on plugs, no
valve problems found during bi-annual compression tests etc. I had to switch
to 100LL to feed the Supercharged engines on the UTVA's, so now I do a LOT
of leaning to keep the plugs clean in my Rebel. If and when I ever sell both
of them, I will probably switch back to their 80/87 (even though it is 2 or
3 cents more a liter than 100LL).
Just my 2 cents, no law suits please if you mileage varies!!! That's why I
installed COMPLETE aluminum lines (from tanks to gascolator) and electric
senders in my tanks (that I rarely pay attention to unless they suddenly say
"E", as I dip before each flight and know how far that will get me). No
clear or rubber lines to contend with (other than gascolator to carb)
ALTHOUGH I really have to admit I have liked flying the refurbs I did with
the visual sight gauges(although they are not accurate either when running a
ram air vent in the cross vent line!!)
Wayne
----- Original Message -----
From: "Drew and Jan" <
drewjan@execulink.com>
To: <
murphy-rebel@dcsol.com>
Sent: Thursday, August 30, 2001 7:13 PM
Subject: Re: 100ll vs auto fuel
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*-------------------------------------------------------------------------*
Thanks Ken. I believe it was Bill Tee that wrote quite a lot on sight
guages for the RAA several years ago. tygothane was the only clear tubing
he recommended. I spent a lot of time finding a source for it in London
and
it was quite expensive which I wouldn't have minded except it went hard in
about 3 months. A freind with a homebuilt cub suggested ski doo gas line
and I have used it for the last year with it only going half hard at the
end of the year.This tubing has a pink tinge to it but when I went to buy
more the dealer had changed suppliers and was now selling clear stuff. Of
course he told me he switched because the new stuff is better and that all
his customers love it. THis is the tubing I had go hard in only a couple
of
days. I'm going to try a different snowmobile dealer and whatever tubing I
buy I'm going to soak a peice of it in a bottle of gas for at least a week
and check for changes before I instal it on my plane.
Drew
At 02:23 PM 8/30/01 -0400, you wrote:
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Within the last month I have read an article somewhere on sight gauges
(concerning a fatal ultralight accident). I will look for it but it said
to use
urethane tubing only. Tygothane was mentioned I believe, but Spruce lists
a
couple of urethane tubing lines in most sizes. Anything else (except
maybe
teflon) will apparently harden and shrink fairly quickly.
The manufacturer is adamant that pump gas containing alcohol will not
harm
pro-seal in any way. There are other very good reasons to avoid alcohol
though
and I think there is still a lot of info on the EAA web site. The alcohol
rap
probably comes from problems with sloshing compounds not pro-seal.
In Southern Ontario there is usually a small sticker saying "may contain
up to
10% alcohol" on any gas pump that has alcohol in it. I have never seen
the
sticker on an Esso pump or a Shell pump here. Sunoco and Coop definately
have
them. Pretty easy to check for alcohol yourself to make sure.
The Cessna Pilots Association has claimed significantly lower maintanance
costs
if you avoid leaded fuel (US$10./hr). For an engine that can burn 80/87
there is
evidence to suggest that using leaded fuel occasionally, or mixing it,
provides
almost all the benefits and reduces the negative effects of using it. The
only
problem that I can recall with mixing avgas and mogas was related to
anti-icing
additives in the avgas and alcohol in mogas??? We certainly mix them
frequently
but no alcohol.
Ken
Drew and Jan wrote:
Thanks Bob I knew that alcohol was bad news for pro-seal but I didn't
know
shell was always safe. The 80 octane in southern ont. comes from a
different refinery than it used to so maybe it's better now. That said
I
just changed my sight guage on the one side and the new line went hard
in
only a couple of days.
Drew
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