Author: "bunderhill2004" <bunderhill2004@...> Time: Tue Aug 9, 2005 5:26 pm PDT Link
I am starting to think about the fuel system and have a few concerns...
1-Vans has the fuel line running down the centre of the forward section
of the fuselage floor, directly above the engine exhaust. Plans specify
it should be encased in insulation but I would think it would be better
if it could be located away from the heat source entirely.
2-The fuel line goes down to the floor, anong the floor, and then up to
the fuel pump and gascolator. There is no way to drain the lowest part
of the fuel line for water contamination.
Has anyone done some redesign or has thought about it?
Regards, Bruce
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Author: "build9a" <eckdahl@...> Time: Wed Aug 10, 2005 5:48 am PDT Link
Bruce: As you have already discovered the gascolator is not the
lowest spot in the fuel system. The wing sumps are the lowest point
and that is where the water should collect, if any. Draining the sumps
before each flight should remove any water. In the Vans
recommended set-up it appears to me that the gascolator serves more as
a fuel filter than a gascolator. Having never seen the inside of a
gascolator I inspected mine and observed how it works. It seems to me
that it is actually a pretty good fuel filter. Concerning the fuel
lines running down the center of the cabin area; it seems to me that
unless you run the line on the outside of the fuselage, it's going to
be in the cabin somewhere. Hundreds of RVs are flying this way and I
decided to trust Van. My plans didn't say anything about insulating
the lines inside the fuselage. I would like to get the section and
page # from your manual if that's what it says. Cause I sure missed
it. If you are talking about the foam blocks that you run the lines
through, I think they are mainly for spacing and to keep the lines
from vibrating against the floor and not for heat protection. I
really don't think it gets that hot where the exhaust exits below the
fuselage. Hopefully, someone more expert can help out here. And there
really may be a better way to address this. If you are really
concerned, call Vans tech support; they were always helpful and
reassuring based on their experience with helping 4200+ builders.
Jack RV9A flying.
--- In RV-9A@yahoogroups.com, "bunderhill2004" <bunderhill2004@y...>
wrote:
> I am starting to think about the fuel system and have a few
concerns...
> 1-Vans has the fuel line running down the centre of the forward
section
> of the fuselage floor, directly above the engine exhaust. Plans
specify
> it should be encased in insulation but I would think it would be
better
> if it could be located away from the heat source entirely.
> 2-The fuel line goes down to the floor, anong the floor, and then
up to
> the fuel pump and gascolator. There is no way to drain the lowest
part
> of the fuel line for water contamination.
> Has anyone done some redesign or has thought about it?
> Regards, Bruce
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Author: "bunderhill2004" <bunderhill2004@...> Time: Wed Aug 10, 2005 1:30 pm PDT Link
Thanks Jack. Actually, the source of my concern arose from comments
made by someone in the industry who ought to know what he is talking
about. I too thought that maybe it could be done better, I mean
anything can be done better, but I agree the quick drains in the
tanks should take care of any water contamination and the proof of
the design is the 4000+ successful aircraft out there. I thought I
would throw it out there anyway, just to see what came back.
Regards, Bruce.
-- In RV-9A@yahoogroups.com, "build9a" <eckdahl@d...> wrote:
> Bruce: As you have already discovered the gascolator is not the
> lowest spot in the fuel system. The wing sumps are the lowest point
> and that is where the water should collect, if any. Draining the
sumps
> before each flight should remove any water. In the Vans
> recommended set-up it appears to me that the gascolator serves more
as
> a fuel filter than a gascolator. Having never seen the inside of a
> gascolator I inspected mine and observed how it works. It seems to
me
> that it is actually a pretty good fuel filter. Concerning the fuel
> lines running down the center of the cabin area; it seems to me that
> unless you run the line on the outside of the fuselage, it's going
to
> be in the cabin somewhere. Hundreds of RVs are flying this way and
I
> decided to trust Van. My plans didn't say anything about insulating
> the lines inside the fuselage. I would like to get the section and
> page # from your manual if that's what it says. Cause I sure missed
> it. If you are talking about the foam blocks that you run the
lines
> through, I think they are mainly for spacing and to keep the lines
> from vibrating against the floor and not for heat protection. I
> really don't think it gets that hot where the exhaust exits below
the
> fuselage. Hopefully, someone more expert can help out here. And
there
> really may be a better way to address this. If you are really
> concerned, call Vans tech support; they were always helpful and
> reassuring based on their experience with helping 4200+ builders.
> Jack RV9A flying.
> --- In RV-9A@yahoogroups.com, "bunderhill2004" <bunderhill2004@y...>
> wrote:
> > I am starting to think about the fuel system and have a few
> concerns...
> > 1-Vans has the fuel line running down the centre of the forward
> section
> > of the fuselage floor, directly above the engine exhaust. Plans
> specify
> > it should be encased in insulation but I would think it would be
> better
> > if it could be located away from the heat source entirely.
> > 2-The fuel line goes down to the floor, anong the floor, and then
> up to
> > the fuel pump and gascolator. There is no way to drain the lowest
> part
> > of the fuel line for water contamination.
> > Has anyone done some redesign or has thought about it?
> > Regards, Bruce
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Author: "Matthew" <matthew@...> Time: Wed Aug 10, 2005 1:31 pm PDT Link
An interesting item to point out.... I can't recall EVER see'ng an RV
flyer drain the wing sumps before taking off. I've flown in a half a
dozen RV's and not once did the drain.
How many RV'ers actually check/drain wing sumps? Maybe this is only
done once after the plane has set for awhile or right after fueling..
I dunno.
Matthew
RV-9A (Wiring avionics)
www.n523rv.com
#90569
--- In RV-9A@yahoogroups.com, "build9a" <eckdahl@d...> wrote:
> Bruce: As you have already discovered the gascolator is not the
> lowest spot in the fuel system. The wing sumps are the lowest point
> and that is where the water should collect, if any. Draining the
sumps
> before each flight should remove any water. In the Vans
> recommended set-up it appears to me that the gascolator serves more
as
> a fuel filter than a gascolator. Having never seen the inside of a
> gascolator I inspected mine and observed how it works. It seems to
me
> that it is actually a pretty good fuel filter. Concerning the fuel
> lines running down the center of the cabin area; it seems to me that
> unless you run the line on the outside of the fuselage, it's going
to
> be in the cabin somewhere. Hundreds of RVs are flying this way and
I
> decided to trust Van. My plans didn't say anything about insulating
> the lines inside the fuselage. I would like to get the section and
> page # from your manual if that's what it says. Cause I sure missed
> it. If you are talking about the foam blocks that you run the
lines
> through, I think they are mainly for spacing and to keep the lines
> from vibrating against the floor and not for heat protection. I
> really don't think it gets that hot where the exhaust exits below
the
> fuselage. Hopefully, someone more expert can help out here. And
there
> really may be a better way to address this. If you are really
> concerned, call Vans tech support; they were always helpful and
> reassuring based on their experience with helping 4200+ builders.
> Jack RV9A flying.
> --- In RV-9A@yahoogroups.com, "bunderhill2004" <bunderhill2004@y...>
> wrote:
> > I am starting to think about the fuel system and have a few
> concerns...
> > 1-Vans has the fuel line running down the centre of the forward
> section
> > of the fuselage floor, directly above the engine exhaust. Plans
> specify
> > it should be encased in insulation but I would think it would be
> better
> > if it could be located away from the heat source entirely.
> > 2-The fuel line goes down to the floor, anong the floor, and then
> up to
> > the fuel pump and gascolator. There is no way to drain the lowest
> part
> > of the fuel line for water contamination.
> > Has anyone done some redesign or has thought about it?
> > Regards, Bruce
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Author: Matt Burch <mcb@...> Time: Wed Aug 10, 2005 1:55 pm PDT Link
On Wed, 10 Aug 2005, Matthew wrote:
> An interesting item to point out.... I can't recall EVER see'ng an RV
> flyer drain the wing sumps before taking off. I've flown in a half a
> dozen RV's and not once did the drain.
Hey now - both you and your wife flew in my 9A and I drained the sumps
before the first flight of the day just like I always do. You probably
didn't notice because I already had the plane preflighted and ready! ;)
mcb
RV-9A N119TJ (sold)
RV-7 emp
--
-------------------------------------------------------
Matt Burch | http://www.ambrosiasw.com/~mburch/
mcb@sunflower.com |
-------------------------------------------------------
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Author: "Frank" <fthor@...> Time: Wed Aug 10, 2005 7:07 pm PDT Link
Every first flight of the day and after taking on fuel.
Frank N821BF 100hrs and still smiling
----- Original Message -----
From: Matthew
To: RV-9A@yahoogroups.com
Sent: Wednesday, August 10, 2005 4:31 PM
Subject: [RV-9A] Re: fuel systems
An interesting item to point out.... I can't recall EVER see'ng an RV
flyer drain the wing sumps before taking off. I've flown in a half a
dozen RV's and not once did the drain.
How many RV'ers actually check/drain wing sumps? Maybe this is only
done once after the plane has set for awhile or right after fueling..
I dunno.
Matthew
RV-9A (Wiring avionics)
www.n523rv.com
#90569
--- In RV-9A@yahoogroups.com, "build9a" <eckdahl@d...> wrote:
> Bruce: As you have already discovered the gascolator is not the
> lowest spot in the fuel system. The wing sumps are the lowest point
> and that is where the water should collect, if any. Draining the
sumps
> before each flight should remove any water. In the Vans
> recommended set-up it appears to me that the gascolator serves more
as
> a fuel filter than a gascolator. Having never seen the inside of a
> gascolator I inspected mine and observed how it works. It seems to
me
> that it is actually a pretty good fuel filter. Concerning the fuel
> lines running down the center of the cabin area; it seems to me that
> unless you run the line on the outside of the fuselage, it's going
to
> be in the cabin somewhere. Hundreds of RVs are flying this way and
I
> decided to trust Van. My plans didn't say anything about insulating
> the lines inside the fuselage. I would like to get the section and
> page # from your manual if that's what it says. Cause I sure missed
> it. If you are talking about the foam blocks that you run the
lines
> through, I think they are mainly for spacing and to keep the lines
> from vibrating against the floor and not for heat protection. I
> really don't think it gets that hot where the exhaust exits below
the
> fuselage. Hopefully, someone more expert can help out here. And
there
> really may be a better way to address this. If you are really
> concerned, call Vans tech support; they were always helpful and
> reassuring based on their experience with helping 4200+ builders.
> Jack RV9A flying.
> --- In RV-9A@yahoogroups.com, "bunderhill2004" <bunderhill2004@y...>
> wrote:
> > I am starting to think about the fuel system and have a few
> concerns...
> > 1-Vans has the fuel line running down the centre of the forward
> section
> > of the fuselage floor, directly above the engine exhaust. Plans
> specify
> > it should be encased in insulation but I would think it would be
> better
> > if it could be located away from the heat source entirely.
> > 2-The fuel line goes down to the floor, anong the floor, and then
> up to
> > the fuel pump and gascolator. There is no way to drain the lowest
> part
> > of the fuel line for water contamination.
> > Has anyone done some redesign or has thought about it?
> > Regards, Bruce
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Author: "Matthew" <matthew@...> Time: Thu Aug 11, 2005 6:15 am PDT Link
Kinda of what I expected.. first flight of day and after fueling.
Yea.. you're right.. I was usually late for my rides. :-)
Matthew
RV-9A (Avionics wiring)
www.n523rv.com
--- In RV-9A@yahoogroups.com, Matt Burch <mcb@s...> wrote:
> On Wed, 10 Aug 2005, Matthew wrote:
>
> > An interesting item to point out.... I can't recall EVER see'ng
an RV
> > flyer drain the wing sumps before taking off. I've flown in a
half a
> > dozen RV's and not once did the drain.
>
> Hey now - both you and your wife flew in my 9A and I drained the
sumps
> before the first flight of the day just like I always do. You
probably
> didn't notice because I already had the plane preflighted and
ready! ;)
>
> mcb
> RV-9A N119TJ (sold)
> RV-7 emp
>
> --
> -------------------------------------------------------
> Matt Burch | http://www.ambrosiasw.com/~mburch/
> mcb@s... |
> -------------------------------------------------------
Yahoo! Groups Links
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