Today's Message Index:
----------------------
1. 07:42 AM - Fuel Pressure (BobbyPaulk@comcast.net)
2. 08:41 AM - Re: Re: Gas spill from Bing carb (FLYaDIVE)
3. 08:53 AM - Re: Fuel Pressure (Lynn Matteson)
4. 09:06 AM - FUEL TANK SEALANTS (FLYaDIVE)
5. 10:10 AM - Re: FUEL TANK SEALANTS (Pete Krotje)
6. 10:12 AM - Re: Gas spill from Bing carb (ces308)
7. 10:43 AM - Carb - Shutdown/Fuel (Don Honabach)
Message 1
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List
One other thing on leaking carby's.
Make sure you have the new Black floats. The Old white ones ( Not good for ethanol
) on mine would not hold at 1.5 lbs. of pressure. I changed the needle to
the new black tip and it made no difference. I put the carb in a clear plastic
bowl and set the fuel level with the bottom off the Carb. I pressurized it using
a very fine calibrated gauge and it would leak profusely at less than 2 psi.
The black floats fixed the problem.
Bobby
Message 2
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| Subject: | Re: Gas spill from Bing carb |
Chris:
If the fuel pressure is high - How do you/did you reduce it?
Barry
>
>
Message 3
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| Subject: | Re: Fuel Pressure |
With all this talk about the float needle, let's remember that there
are black-tipped needles (the rubber end is black) and needles with
silver, gold, and *black* springs, (or at least a silver, gold, or
black colored spring end, which is a code for the strength of the
spring within the needle) and make sure you know which one you're
referring to.
Lynn Matteson
Kitfox IV Speedster, taildragger
Jabiru 2200, #2062
Sensenich 62"x 55.5 Wood (winter) until the Prince prop arrives
Electroair direct-fire ignition system
Rotec TBI-40 injection
Status: flying...1078+ hrs (since 3-27-2006)
Message 4
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| Subject: | FUEL TANK SEALANTS |
Hello Gaggle:
I have been fighting leaking fuel tans for a while. The tanks are aluminum
and sealed with PRO SEAL or the equivalent.
Since my engine likes both AvGas and MoGas and MoGas has ethanol I would
like a sealant that can stand up to both.
Stop - I know about the trick of removing the ethanol from MoGas but that is
only about 90% effective.
I would like to run straight MoGas.
Would anyone out there have any experience in this area?
Thank you for the assistance.
Barry
Message 5
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| Subject: | FUEL TANK SEALANTS |
This will be long so please bear with me,
The question of solvents in auto gas is a good bit more involved than just
ethanol. We've recently had customers with fiberglass tanks and others with
poly tanks who have had problems with auto gas even with no ethanol. In
some cases the auto gas has dissolved the tank sealant even though the
sealant is supposed to be ethanol resistant. In other cases the auto gas
has reacted with something to form stringy mucus like strands that are quite
good a gumming up the carb slide. In two other cases something in auto gas
coated the inside of the engine with a black combustion product that looked
much like burned carmelized sugar (coated valves and valve guides resulting
in stuck valves) At this point Jabiru USA is unable to pinpoint the cause of
the fuel anomalies.
We have been investigating what may cause tank sealants to dissolve and
have been surprised at what we have found. Anyone can find the same info if
you dig hard enough and pursue the initial Google findings. A week spent
digging and following various leads will result in dozens of reports on auto
gas quality issues. We have seen reports detailing contaminants in fuel
found in the Detroit area that included ethanol, methanol, MEK, acetone,
toluene, TAME and MTBE. Tank sealants are not designed to stand up to many
of those contaminants.
Additionally, many tank sealants are labeled as resistant to 10% or 15%
ethanol concentrations. If the gas - ethanol mix stays blended the
concentrations may stay below those limits. However - when some
condensation enters the tank the resulting moisture combines with ethanol
very readily (ethanol will combine with water much faster or more easily
than with gasoline). At some point the water ethanol mixture becomes
heavier than gas and sinks to the bottom of the tank where it may remain
with the ethanol concentration higher than 15%. This concentration exceeds
the tolerance of many tank sealants and can dissolve the sealant. Since
aircraft are prone to sitting for longer periods than cars, the ethanol mix
at the bottom of the tank can be undisturbed sometimes for weeks or even
months at t time while dissolving the sealant.
Again, We are not even close to having many answers but offer these
observations on what we've seen from auto gas use over the last 12 years.
We really have not been able to come to any solid conclusions other than to
think about installing welded aluminum tanks (not an option for many
planes).
On the other hand - we've yet to see a tank problem with the sealants we use
when the aircraft is flown exclusively on avgas 100LL. It costs a bit more
but we view it as cheap insurance for our planes with tanks sealed with any
of the commercial sealants out there today.
Pete Krotje
Jabiru USA Sport Aircraft, LLC
931-680-2800
www.usjabiru.com
From: owner-jabiruengine-list-server@matronics.com
[mailto:owner-jabiruengine-list-server@matronics.com] On Behalf Of FLYaDIVE
Sent: Wednesday, January 12, 2011 11:04 AM
Subject: JabiruEngine-List: FUEL TANK SEALANTS
Hello Gaggle:
I have been fighting leaking fuel tans for a while. The tanks are aluminum
and sealed with PRO SEAL or the equivalent.
Since my engine likes both AvGas and MoGas and MoGas has ethanol I would
like a sealant that can stand up to both.
Stop - I know about the trick of removing the ethanol from MoGas but that is
only about 90% effective.
I would like to run straight MoGas.
Would anyone out there have any experience in this area?
Thank you for the assistance.
Barry
Message 6
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| Subject: | Re: Gas spill from Bing carb |
Barry....
Well ..I guess the correct way is to change the return spring inside the fuel
pump...it's about 1" in diameter and about an inch and a half long,with a new
one....we took the old one and cut off about 7/16 of an inch...this made the spring
shorter and weaker,and that dropped the pressure to 1.7 at idle and 3 at
WOT....but my buddy made a luck guess on the cut, and also another spring will
most likely have a different tension than mine ...and I'm guessing also when
you cut it off,it's just a matter of time before it starts to stiffen up and
increase the pressure too...I have no idea why the spring gets stiffer...we have
so theories,but I m not sure anyone is buying it...lol
I believe I'm going to connect a fuel pressure sensor to my Grand Rapids Tech engine
monitor and when I see the pressure going up past 4 I'll change the spring
again...I think the pressure on mine has been going up for the last year until
the float needle finally said,you know what? I'm not playing any more ! and
started flooding out the carb.
There is a chance the floats could be bad...but my money is on the fuel pump....at
least I would start there first...if thats ok ,then take the carb bowl off
and check everything in there.
Good luck !
chris ambrose
M3X/Jabiru A-2200 170. hrs when this started
N327CS
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=326715#326715
Message 7
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| Subject: | Carb - Shutdown/Fuel |
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