-----Original Message-----
From: Q-LIST@... [mailto:Q-LIST@...] On Behalf Of
Darrell Daniels
Sent: Wednesday, September 13, 2006 10:02 AM
To: Q-LIST@...
Subject: Re: [Q-LIST] Fuel Tanks
Thanks Bob,
The leak test is what I was thinking I needed to do. What got me
started on this again was I asked why I could not run auto fuel in a VW
engine and one of the answers was that someone heard that auto fuel would
penetrate the epoxy. I am actual glad for this as I have learned a lot from
this thread . My thanks Darrell Daniels Tri Q rebuild
----- Original Message -----
From: "Bob Farnam" <bfarnam@pacbell. <mailto:bfarnam%40pacbell.net> net>
To: <Q-LIST@yahoogroups. <mailto:Q-LIST%40yahoogroups.com> com>
Sent: Wednesday, September 13, 2006 11:33 AM
Subject: RE: [Q-LIST] Fuel Tanks
If nothing extra was done by the original builder, there is some chance
that
it will leak. If you can't find out what was done during construction,
then
I guess my next step would be to do a long term leakdown test. This can be
done by sealing up all of the openings except the supply line to the pump.
Then put an inflated balloon on the supply line and let it sit for 24
hours
to see if any volume is lost. Check all the seal points with soapy water.
If
it is tight, go fly. If not, cut some holes and at least paint on more
epoxy
inside. Unfortunately, the internal baffles mean that you will have to cut
holes into each section between the baffles. Hope that it passes the
leakdown test. Understand that a tiny amount of leakage into the fuse foam
won't hurt the foam, which is fuelproof. Only the Styrafoam in the wings
is
at risk of dissolving. I recommend against any sealant except epoxy. I
have
heard (but don't know firsthand) that some of the elastomer sealants are
attacked by auto fuel. Others on this list may know about that.
Incidentally, EZ-Poxy is supposed to be the modern equivalent of
Safe-T-Poxy. My 7.5 gallon aux. tank is made of EZ-Poxy and is fine after
about 7 years.
Good luck!
Bob F.
N200QK
-----Original Message-----
From: Q-LIST@yahoogroups. <mailto:Q-LIST%40yahoogroups.com> com
[mailto:Q-LIST@yahoogroups. <mailto:Q-LIST%40yahoogroups.com> com]On Behalf
Of
Darrell Daniels
Sent: Wednesday, September 13, 2006 6:00 AM
To: Q-LIST@yahoogroups. <mailto:Q-LIST%40yahoogroups.com> com
Subject: Re: [Q-LIST] Fuel Tanks
I did not build my airplane so what would be your recommendation Would
you
just put the auto fuel in and fly or cut some holes in the top of the
tank
and seal it with something. Thanks Darrell
----- Original Message -----
From: <bfarnam@pacbell. <mailto:bfarnam%40pacbell.net> net>
To: <Q-LIST@yahoogroups. <mailto:Q-LIST%40yahoogroups.com> com>
Sent: Wednesday, September 13, 2006 1:16 AM
Subject: Re: [Q-LIST] Fuel Tanks
Here's one more data point for you Darrell. My Q200 has been flying for
more than 8 years using auto gas when I am at home and 100LL away on a
trip. My tanks are made of Safe-T-Poxy. I have also had a sample of the
tank material soaking in auto gas with MTBE for about 7 years. There is
no
sign of softening or other problem. The main source of leakage that I
have
seen is into the fuselage layup which typically had a lot of pinholes.
Those can be sealed several ways during construction. Either sand and
recoat with a fairly heavy layer of epoxy, or some have added another
layer of glass. Mine is sealed with just an extra coating of epoxy.
Done
properly, the epoxy tanks won't leak.
Bob F.
N200QK
----- Original Message ----
From: Darrell Daniels <log@... <mailto:log%40nemr.net> >
To: Q-LIST@yahoogroups. <mailto:Q-LIST%40yahoogroups.com> com
Sent: Tuesday, September 12, 2006 8:19:03 PM
Subject: [Q-LIST] Fuel Tanks
I have been searching the archives as I am still not satisfied with the
idea
that fuel can leak through you tank and into the foam of you airplane .
I
also wan to burn auto fuel . After all of my reading it seems the only
people who have actually done anything is using a slosh coating which
is
not
really practical it a Q but it seems to be the only option is you want
to
burn car gas or rid of the possible fuel leak.
The one exception is in the Archive Sam in one entry said something
about using a fuel resistant epoxy but you could not get to all of the
places to sand to easily recoat the entire inside of the tank. Any
other
ideas or am I making much to do for nothing Darrell Daniels Tri Q
rebuild
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