The Murphy Builders Site

And every fitting adds flow restriction. OTOH you don't want excessive
tubing in a hot area to pick up heat either. And most important is to
have enough length and curves to allow flexing as the engine moves
around. I think Drew knows all this though so he must have something
tricky going on... Sometimes a well supported curved section of
aluminum or steel tube can position the fittings nicely for the flex
hose run.
Ken

kpierson@dcsol.com wrote:

My advise is to use the least amount of fittings possible.
it helps avoid leaks.

Keith.

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FWIW, I have similar curve issues for the flex line to the carb, which
has to circle back and up in an "S" curve, while leaving space inside
the final curve at the carb end for a throttle cable, etc. Leaving the
fuel pressure "T" fitting on the FW, which is right of centerline, the
flex line is made from an Aeroquip 180 deg. curved hose end fitting
(available from Summit Racing) going into an 8" section of stainless
braided flex line, ending in a 120 deg. curved hose end fitting to the carb.

Although these preformed, curved hose end fittings are not cheap, I
wanted to avoid using cheaper right angle AN fittings, which cause
greater flow restriction. The whole fuel system is gravity fed. I
haven't done a flow test yet but am hopeful that the use of curved
fittings will minimize flow restriction.

I've uploaded two photos to the archives, in the Files, Rebel, 212-Fuel
System section. Not shown is fire sleeve which will be added to the
hose, of course.

Ron
254R


Ken wrote:

And every fitting adds flow restriction. OTOH you don't want excessive
tubing in a hot area to pick up heat either. And most important is to
have enough length and curves to allow flexing as the engine moves
around. I think Drew knows all this though so he must have something
tricky going on... Sometimes a well supported curved section of
aluminum or steel tube can position the fittings nicely for the flex
hose run.
Ken

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On my new O-360 Lyc installation, the gascolator is also too close to the carb. As a result, I will have to loop a flexible fuel line down with a 90 degree outlet from the gascolator and then up to to a 90 degree inlet to the carb. Not ideal, but I had the same situatiion with my old 320 (even though it was further back), and it worked fine, providing plenty of flex between the carb and gascolator.

Walter

----- Original Message -----
From: Ron Shannon <rshannon@cruzcom.com>
Date: Friday, April 4, 2008 10:48 am
Subject: Re: [rebel-builders] RE: fuel line
To: rebel-builders@dcsol.com

FWIW, I have similar curve issues for the flex line to the carb,
which
has to circle back and up in an "S" curve, while leaving space
inside
the final curve at the carb end for a throttle cable, etc.
Leaving the
fuel pressure "T" fitting on the FW, which is right of
centerline, the
flex line is made from an Aeroquip 180 deg. curved hose end
fitting
(available from Summit Racing) going into an 8" section of
stainless
braided flex line, ending in a 120 deg. curved hose end fitting
to the carb.

Although these preformed, curved hose end fittings are not
cheap, I
wanted to avoid using cheaper right angle AN fittings, which
cause
greater flow restriction. The whole fuel system is gravity fed.
I
haven't done a flow test yet but am hopeful that the use of
curved
fittings will minimize flow restriction.

I've uploaded two photos to the archives, in the Files, Rebel,
212-Fuel
System section. Not shown is fire sleeve which will be added to
the
hose, of course.

Ron
254R


Ken wrote:

And every fitting adds flow restriction. OTOH you don't want

excessive

tubing in a hot area to pick up heat either. And most

important is to

have enough length and curves to allow flexing as the engine

moves

around. I think Drew knows all this though so he must have

something

tricky going on... Sometimes a well supported curved

section of

aluminum or steel tube can position the fittings nicely for

the flex

hose run.
Ken

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At 11:14 AM 4/4/2008 -0700, you wrote:

On my new O-360 Lyc installation, the gascolator is also too close to the

carb. As a result, I will have to loop a flexible fuel line down with a 90
degree outlet from the gascolator and then up to to a 90 degree inlet to
the carb. Not ideal, but I had the same situatiion with my old 320 (even
though it was further back), and it worked fine, providing plenty of flex
between the carb and gascolator.

Walter

Hi Walter That would work but I'm trying to keep a steady slope from the
gascolator to the carb. I read somewhere that a loop like that could
collect water and freeze or send a big slug through all at once.
Drew



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At 07:51 PM 4/3/2008 -0800, you wrote:

My advise is to use the least amount of fittings possible.
it helps avoid leaks.

Keith.

Thanks Keith. Same number of fittings with each option.
Drew



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At 10:47 AM 4/4/2008 -0700, you wrote:

FWIW, I have similar curve issues for the flex line to the carb, which
has to circle back and up in an "S" curve, while leaving space inside
the final curve at the carb end for a throttle cable, etc. Leaving the
fuel pressure "T" fitting on the FW, which is right of centerline, the
flex line is made from an Aeroquip 180 deg. curved hose end fitting
(available from Summit Racing) going into an 8" section of stainless
braided flex line, ending in a 120 deg. curved hose end fitting to the carb.

Although these preformed, curved hose end fittings are not cheap, I
wanted to avoid using cheaper right angle AN fittings, which cause
greater flow restriction. The whole fuel system is gravity fed. I
haven't done a flow test yet but am hopeful that the use of curved
fittings will minimize flow restriction.

I've uploaded two photos to the archives, in the Files, Rebel, 212-Fuel
System section. Not shown is fire sleeve which will be added to the
hose, of course.

Ron
254R


Ken wrote:

And every fitting adds flow restriction. OTOH you don't want excessive
tubing in a hot area to pick up heat either. And most important is to
have enough length and curves to allow flexing as the engine moves
around. I think Drew knows all this though so he must have something
tricky going on... Sometimes a well supported curved section of
aluminum or steel tube can position the fittings nicely for the flex
hose run.
Ken

Thanks Ken and Ron I didn't even realize ther was a fuel system section in
the archives. The problem is my gascolator is almost directly behind the
carb inlet with the gascolator outlet facing forwards. I think if I put a
fitting on each end pointing at each other they would touch, definately not
enough length to allow flexing so I have to route the line away from the
carb and back again. Maybe I'll have to use a peice of aluminum tube to
gain some separation like you have Ron.
Drew



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Yeah, I thought of that, too, but the water would have to get past the
gascolator first. I have seen other planes done like this, and my inspector
at the time didn't have a problem with it. I would be more concerned if the
loop went upwards, and get trapped air slowing down your fuel flow, which
would not be good with a gravity feed system.

Walter

-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com] On Behalf Of Drew
Dalgleish
Sent: April 4, 2008 6:34 PM
To: rebel-builders@dcsol.com
Subject: Re: [rebel-builders] RE: fuel line

At 11:14 AM 4/4/2008 -0700, you wrote:

On my new O-360 Lyc installation, the gascolator is also too close to the

carb. As a result, I will have to loop a flexible fuel line down with a 90
degree outlet from the gascolator and then up to to a 90 degree inlet to
the carb. Not ideal, but I had the same situatiion with my old 320 (even
though it was further back), and it worked fine, providing plenty of flex
between the carb and gascolator.

Walter

Hi Walter That would work but I'm trying to keep a steady slope from the
gascolator to the carb. I read somewhere that a loop like that could
collect water and freeze or send a big slug through all at once.
Drew



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Would a horizontal (sideways) loop be possible?
Ken

Walter Klatt wrote:

Yeah, I thought of that, too, but the water would have to get past the
gascolator first. I have seen other planes done like this, and my inspector
at the time didn't have a problem with it. I would be more concerned if the
loop went upwards, and get trapped air slowing down your fuel flow, which
would not be good with a gravity feed system.

Walter

-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com] On Behalf Of Drew
Dalgleish
Sent: April 4, 2008 6:34 PM
To: rebel-builders@dcsol.com
Subject: Re: [rebel-builders] RE: fuel line

At 11:14 AM 4/4/2008 -0700, you wrote:

On my new O-360 Lyc installation, the gascolator is also too close to the

carb. As a result, I will have to loop a flexible fuel line down with a 90
degree outlet from the gascolator and then up to to a 90 degree inlet to
the carb. Not ideal, but I had the same situatiion with my old 320 (even
though it was further back), and it worked fine, providing plenty of flex
between the carb and gascolator.

Walter

Hi Walter That would work but I'm trying to keep a steady slope from the
gascolator to the carb. I read somewhere that a loop like that could
collect water and freeze or send a big slug through all at once.
Drew
?

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