Today's Message Index:
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0. 12:16 AM - Please Make a Contribution to Support Your Lists... (Matt Dralle)
1. 01:36 PM - glasair III fuel system (Robert Hunter)
2. 03:27 PM - Re: glasair III fuel system (Dick Gossen)
3. 04:58 PM - Re: glasair III fuel system (Robert Hunter)
4. 07:00 PM - Re: glasair III fuel system (Dick Gossen)
5. 07:46 PM - Re: glasair III fuel system (Robert Buckthal)
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| Subject: | Please Make a Contribution to Support Your Lists... |
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Message 1
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| Subject: | glasair III fuel system |
My ship, #3084, was built in 1989 -1990. Does anyone have a fuel
system description/schematic that would guide me? I have a fuel leak
from the aft fuselage vent, and the smell of fuel in the cabin.
Thanks,
Robert
N957DJ
Message 2
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| Subject: | Re: glasair III fuel system |
Robert, does that happen after filling up the tank(s), or on every flight, even
at 50% or below capacity? I may be able to help in both cases, but they are different.
Dick Gossen
N90GG
Flying my beautiful girl since 1990
On Nov 9, 2013, at 3:36 PM, Robert Hunter <rolahug@gmail.com> wrote:
>
> My ship, #3084, was built in 1989 -1990. Does anyone have a fuel
> system description/schematic that would guide me? I have a fuel leak
> from the aft fuselage vent, and the smell of fuel in the cabin.
>
> Thanks,
>
> Robert
>
> N957DJ
>
>
>
>
Message 3
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| Subject: | Re: glasair III fuel system |
Hello Dick,
I haven't had the mains full up for years, but didrecently fill to the
brim the header tank just before the cabin smell started happening.
Since my email to the list, my mechanic hooked an air compressor to
the fuselage vent tubes. After blowing out the lines,he weighted the
aft fuselage on the ground, lifting the nose up at a high angle. No
sign of a leaking vent tube. I then flew the aircraft, and smelled
nothing. When I landed, there was no leak at the fuselage vent.
Happy, for sure, but suspicious I haven't really solved the problem.
Any thoughts you have would be greatly appreciated.
Robert
On Sat, Nov 9, 2013 at 4:26 PM, Dick Gossen <gossend@gmail.com> wrote:
>
> Robert, does that happen after filling up the tank(s), or on every flight, even
at 50% or below capacity? I may be able to help in both cases, but they are
different.
> Dick Gossen
> N90GG
> Flying my beautiful girl since 1990
>
> On Nov 9, 2013, at 3:36 PM, Robert Hunter <rolahug@gmail.com> wrote:
>
>>
>> My ship, #3084, was built in 1989 -1990. Does anyone have a fuel
>> system description/schematic that would guide me? I have a fuel leak
>> from the aft fuselage vent, and the smell of fuel in the cabin.
>>
>> Thanks,
>>
>> Robert
>>
>> N957DJ
>>
>>
>>
>>
>
>
Message 4
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| Subject: | Re: glasair III fuel system |
OK....I just collaborated with my fellow Glasair friend, Bob Buckthal. I have a
Glasair III, Bob has a Glasair IIS. We agree that your problem may be a non-problem.
The way your airplane is plumbed, there are three vents going to the vent
manifold on the belly. Each main wing tank is vented to that manifold, and
the 'header tank' (actually AUX tank) is vented there as well. The purpose of
the vents is to allow air to flow into the tank(s) as fuel is consumed by the
engine. If any of the three vents gets fuel in it, on the other hand, the fuel
will drain down and exit one or both of the belly vent tubes, then run back
to the tail, where it will be sucked into the fuselage cavity through the opening
where the elevator pushrod exits. You'll smell it immediately.
To restate: The belly vent manifold has two exit tubes (in case one gets blocked)
and is connected internally by three lines: one from each outer wing, and one
from the upper side of the AUX tank near the top. If you fill the AUX "to the
brim", it will dump the first 1/2 inch or so of fuel overboard through the
belly vent. It will be smelly. Don't smoke!
Bob, anything to add?
DG
N90GG
On Nov 9, 2013, at 6:58 PM, Robert Hunter <rolahug@gmail.com> wrote:
>
> Hello Dick,
>
> I haven't had the mains full up for years, but didrecently fill to the
> brim the header tank just before the cabin smell started happening.
> Since my email to the list, my mechanic hooked an air compressor to
> the fuselage vent tubes. After blowing out the lines,he weighted the
> aft fuselage on the ground, lifting the nose up at a high angle. No
> sign of a leaking vent tube. I then flew the aircraft, and smelled
> nothing. When I landed, there was no leak at the fuselage vent.
> Happy, for sure, but suspicious I haven't really solved the problem.
> Any thoughts you have would be greatly appreciated.
>
> Robert
>
> On Sat, Nov 9, 2013 at 4:26 PM, Dick Gossen <gossend@gmail.com> wrote:
>>
>> Robert, does that happen after filling up the tank(s), or on every flight, even
at 50% or below capacity? I may be able to help in both cases, but they are
different.
>> Dick Gossen
>> N90GG
>> Flying my beautiful girl since 1990
>>
>> On Nov 9, 2013, at 3:36 PM, Robert Hunter <rolahug@gmail.com> wrote:
>>
>>>
>>> My ship, #3084, was built in 1989 -1990. Does anyone have a fuel
>>> system description/schematic that would guide me? I have a fuel leak
>>> from the aft fuselage vent, and the smell of fuel in the cabin.
>>>
>>> Thanks,
>>>
>>> Robert
>>>
>>> N957DJ
>>>
>>>
>>>
>>>
>>
>>
>>
>>
>>
>>
>
>
>
>
Message 5
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| Subject: | Re: glasair III fuel system |
At high power settings and high AOA I would get a CO alarm. I spent a lot
of time sealing the underside of the airplane only to discover that the CO
was getting in through the rudder opening. Same thing would happen
whenever fuel vented onto the belly. Level flight was always successful
at clearing the CO alarm or fuel smell. The plans called for the aux tank
vents to be on the side to the tank. If the builder did not alter the
location of the vents inside the tank the top 4 to 6 inches of the tank
will not be useable due to the curvature of the top of the tank. Any
attempt to fill that space will likely go out the vent onto the belly or
the ground.
Bob
N223B
On Sat, Nov 9, 2013 at 6:59 PM, Dick Gossen <gossend@gmail.com> wrote:
>
> OK....I just collaborated with my fellow Glasair friend, Bob Buckthal. I
> have a Glasair III, Bob has a Glasair IIS. We agree that your problem may
> be a non-problem. The way your airplane is plumbed, there are three vents
> going to the vent manifold on the belly. Each main wing tank is vented to
> that manifold, and the 'header tank' (actually AUX tank) is vented there as
> well. The purpose of the vents is to allow air to flow into the tank(s) as
> fuel is consumed by the engine. If any of the three vents gets fuel in it,
> on the other hand, the fuel will drain down and exit one or both of the
> belly vent tubes, then run back to the tail, where it will be sucked into
> the fuselage cavity through the opening where the elevator pushrod exits.
> You'll smell it immediately.
> To restate: The belly vent manifold has two exit tubes (in case one gets
> blocked) and is connected internally by three lines: one from each outer
> wing, and one from the upper side of the AUX tank near the top. If you fill
> the AUX "to the brim", it will dump the first 1/2 inch or so of fuel
> overboard through the belly vent. It will be smelly. Don't smoke!
>
> Bob, anything to add?
> DG
> N90GG
>
> On Nov 9, 2013, at 6:58 PM, Robert Hunter <rolahug@gmail.com> wrote:
>
> >
> > Hello Dick,
> >
> > I haven't had the mains full up for years, but didrecently fill to the
> > brim the header tank just before the cabin smell started happening.
> > Since my email to the list, my mechanic hooked an air compressor to
> > the fuselage vent tubes. After blowing out the lines,he weighted the
> > aft fuselage on the ground, lifting the nose up at a high angle. No
> > sign of a leaking vent tube. I then flew the aircraft, and smelled
> > nothing. When I landed, there was no leak at the fuselage vent.
> > Happy, for sure, but suspicious I haven't really solved the problem.
> > Any thoughts you have would be greatly appreciated.
> >
> > Robert
> >
> > On Sat, Nov 9, 2013 at 4:26 PM, Dick Gossen <gossend@gmail.com> wrote:
> >>
> >> Robert, does that happen after filling up the tank(s), or on every
> flight, even at 50% or below capacity? I may be able to help in both cases,
> but they are different.
> >> Dick Gossen
> >> N90GG
> >> Flying my beautiful girl since 1990
> >>
> >> On Nov 9, 2013, at 3:36 PM, Robert Hunter <rolahug@gmail.com> wrote:
> >>
> >>>
> >>> My ship, #3084, was built in 1989 -1990. Does anyone have a fuel
> >>> system description/schematic that would guide me? I have a fuel leak
> >>> from the aft fuselage vent, and the smell of fuel in the cabin.
> >>>
> >>> Thanks,
> >>>
> >>> Robert
> >>>
> >>> N957DJ
> >>>
> >>>
> >>>
> >>>
> >>
> >>
> >>
> >>
> >>
> >>
> >
> >
> >
> >
>
>
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