Today's Message Index:
----------------------
1. 03:41 AM - Re: Left\Right Fuel Systems? (NYTerminat@aol.com)
2. 06:27 AM - Re: Left\Right Fuel Systems? (John Marzulli)
3. 07:05 AM - Re: Left\Right Fuel Systems? (Doug MacDonald)
4. 08:52 AM - Re: LeftRight Fuel Systems? (Roland Smith)
5. 11:23 AM - Re: Left\Right Fuel Systems? (Tommy Walker)
6. 04:01 PM - Re: Left\Right Fuel Systems? (NYTerminat@aol.com)
7. 04:16 PM - Re: Left\Right Fuel Systems? (Craig Payne)
8. 04:25 PM - Re: Left\Right Fuel Systems? (NYTerminat@aol.com)
9. 04:45 PM - Re: Left\Right Fuel Systems? (John Marzulli)
10. 07:25 PM - Re: Left\Right Fuel Systems? (Skyraider)
11. 09:07 PM - Re: LeftRight Fuel Systems? (sonar1@cox.net)
Message 1
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| Subject: | Re: Left\Right Fuel Systems? |
I did the same as Dan, what type of gas caps do you have? I changed to the
caps with pitot tube on them and that has pretty much eliminated any
imbalance. The valve is great to prevent cross feeding from one tank to another
when you are parked on a slope.
Bob Spudis
N701ZX
In a message dated 9/19/2012 1:16:23 A.M. Eastern Daylight Time,
stolpilot.wilde@gmail.com writes:
--> Zenith701801-List message posted by: Dan Wilde
<stolpilot.wilde@gmail.com>
On 9/18/2012 8:53 PM, John Marzulli wrote:
> After ~150 hours of flying I am changing my fuel system from the
> factory plans. The problem\hassel of fuel sloshing and un-even feeding
> in flight has been too much.
>
> What I am proposing \ doing is to have to quick drains on "T" pipes
> where the factory gascolator is. From there each line would move
> forward into the cabin and have it's own fuel filter.
>
> The fuel filters will then feed into a Left\Right\Both selector. From
> the selector the fuel would go to a "real" gascolator and then finally
> into the engine.
>
>
I simply installed valves on each fuel line as it enters the cabin above
my head. Since the right tank feeds first on my airplane, that is the
only valve I need to control during flight. Works great for me.
Dan Wilde
N948DW
Message 2
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| Subject: | Re: Left\Right Fuel Systems? |
I have the factory provided venting caps.
John Marzulli
http://MarzulliPhoto.net/
http://701Builder.blogspot.com/
On Wed, Sep 19, 2012 at 3:41 AM, <NYTerminat@aol.com> wrote:
> **
> I did the same as Dan, what type of gas caps do you have? I changed to the
> caps with pitot tube on them and that has pretty much eliminated any
> imbalance. The valve is great to prevent cross feeding from one tank to
> another when you are parked on a slope.
>
> Bob Spudis
> N701ZX
>
> In a message dated 9/19/2012 1:16:23 A.M. Eastern Daylight Time,
> stolpilot.wilde@gmail.com writes:
>
> stolpilot.wilde@gmail.com>
>
> On 9/18/2012 8:53 PM, John Marzulli wrote:
> > After ~150 hours of flying I am changing my fuel system from the
> > factory plans. The problem\hassel of fuel sloshing and un-even feeding
> > in flight has been too much.
> >
> > What I am proposing \ doing is to have to quick drains on "T" pipes
> > where the factory gascolator is. From there each line would move
> > forward into the cabin and have it's own fuel filter.
> >
> > The fuel filters will then feed into a Left\Right\Both selector. From
> > the selector the fuel would go to a "real" gascolator and then finally
> > into the engine.
> >
> >
> >
> I simply installed valves on each fuel line as it enters the cabin above
> my head. Since the right tank feeds first on my airplane, that is the
> only valve I need to control during flight. Works great for me.
>
> Dan = Use ilities ay - MATRONICS WEB FORUMS - List
> Contribution Web Site p;
>
>
> *
>
> *
>
>
Message 3
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| Subject: | Re: Left\Right Fuel Systems? |
John, I also have a difference in the drain rates for my CH-701fuel tanks. T
he last time I drained my tanks to change the sump drains, I noticed the dif
ference equalized at about the halfway point. Additionally, I have drained o
ne tank completely and verified that I still had normal flow from the drain o
n the gascolator being supplied solely by the other. This was done on the gr
ound so effect in the air might be somewhat different. I have noticed my ta
nk levels do equalize on longer flights though.
I don't want to say that your intended modifications are unnecessary but wou
ld suggest you might want to confirm there is a legitimate concern before ad
ding complexity to your fuel system.
Doug Macdonald
CH-701 from scratch
NW Ontario, Canada
Sent from my iPad
On 2012-09-19, at 8:27 AM, John Marzulli <john.marzulli@gmail.com> wrote:
> I have the factory provided venting caps.
>
> John Marzulli
>
> http://MarzulliPhoto.net/
> http://701Builder.blogspot.com/
>
>
> On Wed, Sep 19, 2012 at 3:41 AM, <NYTerminat@aol.com> wrote:
> I did the same as Dan, what type of gas caps do you have? I changed to the
caps with pitot tube on them and that has pretty much eliminated any imbala
nce. The valve is great to prevent cross feeding from one tank to another wh
en you are parked on a slope.
>
> Bob Spudis
> N701ZX
>
> In a message dated 9/19/2012 1:16:23 A.M. Eastern Daylight Time, stolpilot
.wilde@gmail.com writes:
com>
>
> On 9/18/2012 8:53 PM, John Marzulli wrote:
> > After ~150 hours of flying I am changing my fuel system from the
> > factory plans. The problem\hassel of fuel sloshing and un-even feeding
> > in flight has been too much.
> >
> > What I am proposing \ doing is to have to quick drains on "T" pipes
> > where the factory gascolator is. =46rom there each line would move
> > forward into the cabin and have it's own fuel filter.
> >
> > The fuel filters will then feed into a Left\Right\Both selector. =46rom
> > the selector the fuel would go to a "real" gascolator and then finally
> > into the engine.
> >
> >
> >
> I simply installed valves on each fuel line as it enters the cabin above
> my head. Since the right tank feeds first on my airplane, that is the
> only valve I need to control during flight. Works great for me.
>
> Dan = Use ilities ay - MATRONICS WEB FORUMS - Li
st Contribution Web Site p;
>
>
>
>
>
> ist" target="_blank">http://www.matronics.com/Navigator?Zenith701801-Lis
t
> tp://forums.matronics.com
> _blank">http://www.matronics.com/contribution
>
>
>
>
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>
Message 4
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| Subject: | Re: LeftRight Fuel Systems? |
I don't run L. and R. fuel at the same time. My L and R lines run separately to
a 3-way switch (from Zenith--shown with the aux tank diagrams). Right/ Left/
Off. No Both. I usually run one hour on one tank then switch to the other,
leaving a reserve in each tank. A single line runs through the firewall to
a filter/ gascolator (from ACS). This gives piece of mind. One tank may be
empty, not both.
Roland Smith, 701AA 240 hours
--------
701 kit, Rotax 912 ULS, SensorNetics EFIS, Flying.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=383520#383520
Message 5
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| Subject: | Re: Left\Right Fuel Systems? |
It's been a while, but I remember sending my fuel caps back to zenith and th
ey installed fwd facing vent tubes.
No charge.
Tommy
Sent from my iPad
On Sep 19, 2012, at 9:04 AM, Doug MacDonald <dougsnash@yahoo.com> wrote:
> John, I also have a difference in the drain rates for my CH-701fuel tanks.
The last time I drained my tanks to change the sump drains, I noticed the d
ifference equalized at about the halfway point. Additionally, I have draine
d one tank completely and verified that I still had normal flow from the dra
in on the gascolator being supplied solely by the other. This was done on th
e ground so effect in the air might be somewhat different. I have noticed m
y tank levels do equalize on longer flights though.
>
> I don't want to say that your intended modifications are unnecessary but w
ould suggest you might want to confirm there is a legitimate concern before a
dding complexity to your fuel system.
>
> Doug Macdonald
> CH-701 from scratch
> NW Ontario, Canada
>
> Sent from my iPad
>
> On 2012-09-19, at 8:27 AM, John Marzulli <john.marzulli@gmail.com> wrote:
>
>> I have the factory provided venting caps.
>>
>> John Marzulli
>>
>> http://MarzulliPhoto.net/
>> http://701Builder.blogspot.com/
>>
>>
>> On Wed, Sep 19, 2012 at 3:41 AM, <NYTerminat@aol.com> wrote:
>> I did the same as Dan, what type of gas caps do you have? I changed to th
e caps with pitot tube on them and that has pretty much eliminated any imbal
ance. The valve is great to prevent cross feeding from one tank to another w
hen you are parked on a slope.
>>
>> Bob Spudis
>> N701ZX
>>
>> In a message dated 9/19/2012 1:16:23 A.M. Eastern Daylight Time, stolpilo
t.wilde@gmail.com writes:
.com>
>>
>> On 9/18/2012 8:53 PM, John Marzulli wrote:
>> > After ~150 hours of flying I am changing my fuel system from the
>> > factory plans. The problem\hassel of fuel sloshing and un-even feeding
>> > in flight has been too much.
>> >
>> > What I am proposing \ doing is to have to quick drains on "T" pipes
>> > where the factory gascolator is. =46rom there each line would move
>> > forward into the cabin and have it's own fuel filter.
>> >
>> > The fuel filters will then feed into a Left\Right\Both selector. =46rom
>> > the selector the fuel would go to a "real" gascolator and then finally
>> > into the engine.
>> >
>> >
>> >
>> I simply installed valves on each fuel line as it enters the cabin above
>> my head. Since the right tank feeds first on my airplane, that is the
>> only valve I need to control during flight. Works great for me.
>>
>> Dan = Use ilities ay - MATRONICS WEB FORUMS - L
ist Contribution Web Site p;
>>
>>
>>
>>
>>
>> ist" target="_blank">http://www.matronics.com/Navigator?Zenith701801-Li
st
>> tp://forums.matronics.com
>> _blank">http://www.matronics.com/contribution
>>
>>
>>
>>
>> =========================
=========
>> st">http://www.matronics.com/Navigator?Zenith701801-List
>> =========================
=========
>> cs.com
>> =========================
=========
>> matronics.com/contribution
>> =========================
=========
>>
>
>
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=========
>
Message 6
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| Subject: | Re: Left\Right Fuel Systems? |
I would change to the snorkel caps and see how that works before changing
anything else.
Bob Spudis
In a message dated 9/19/2012 9:31:10 A.M. Eastern Daylight Time,
john.marzulli@gmail.com writes:
I have the factory provided venting caps.
John Marzulli
_http://MarzulliPhoto.net/_ (http://marzulliphoto.net/)
_http://701Builder.blogspot.com/_ (http://701builder.blogspot.com/)
On Wed, Sep 19, 2012 at 3:41 AM, <_NYTerminat@aol.com_
(mailto:NYTerminat@aol.com) > wrote:
I did the same as Dan, what type of gas caps do you have? I changed to the
caps with pitot tube on them and that has pretty much eliminated any
imbalance. The valve is great to prevent cross feeding from one tank to another
when you are parked on a slope.
Bob Spudis
N701ZX
In a message dated 9/19/2012 1:16:23 A.M. Eastern Daylight Time,
_stolpilot.wilde@gmail.com_ (mailto:stolpilot.wilde@gmail.com) writes:
<_stolpilot.wilde@gmail.com_ (mailto:stolpilot.wilde@gmail.com) >
On 9/18/2012 8:53 PM, John Marzulli wrote:
> After ~150 hours of flying I am changing my fuel system from the
> factory plans. The problem\hassel of fuel sloshing and un-even feeding
> in flight has been too much.
>
> What I am proposing \ doing is to have to quick drains on "T" pipes
> where the factory gascolator is. From there each line would move
> forward into the cabin and have it's own fuel filter.
>
> The fuel filters will then feed into a Left\Right\Both selector. From
> the selector the fuel would go to a "real" gascolator and then finally
> into the engine.
>
>
I simply installed valves on each fuel line as it enters the cabin above
my head. Since the right tank feeds first on my airplane, that is the
only valve I need to control during flight. Works great for me.
Dan = Use ilities ay - MATRONICS WEB FORUMS - List Contribution Web Site
p;
ist" target="_blank">http://www.matronics.com/Navigator?Zenith701801-List
tp://forums.matronics.com _blank">http://www.matronics.com/contribution
(http://www.matronics.com/Navigator?Zenith701801-List)
(http://www.matronics.com/contribution)
Message 7
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| Subject: | Left\Right Fuel Systems? |
Wag-Aero sells a cap with the tube. It is delivered straight. You install it
on your tank, clock it to the closed position and then bend the vent pipe to
face forward. As I recall people "tune" the pressure to prevent
over-pressure by varying the angle of the forward-facing tube downward. The
price of $38.95 seems high.
Ram Air Pressure Cap, SKU: E-481-000
http://store.wagaero.com/product_info.php?products_id=8107
-- Craig
Message 8
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| Subject: | Re: Left\Right Fuel Systems? |
I am pretty sure those are the ones that I used. Use a tubing bender to
prevent kinks in the tube.
Bob Spudis
In a message dated 9/19/2012 7:17:09 P.M. Eastern Daylight Time,
craig@craigandjean.com writes:
Wag-Aero sells a cap with the tube. It is delivered straight. You install
it on your tank, clock it to the closed position and then bend the vent
pipe to face forward. As I recall people =9Ctune=9D the pressu
re to prevent
over-pressure by varying the angle of the forward-facing tube downward. T
he
price of $38.95 seems high.
Ram Air Pressure Cap, SKU: E-481-000
_http://store.wagaero.com/product_info.php?products_id=8107_
(http://store.wagaero.com/product_info.php?products_id=8107)
-- Craig
(http://www.matronics.com/Navigator?Zenith701801-List)
(http://www.matronics.com/contribution)
Message 9
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| Subject: | Re: Left\Right Fuel Systems? |
Thanks all for the input...
The main grip is really not uneven feeding during flight, it is the
sloshing of fuel on the ground.
If I fuel up for a long flight and taxi on un-even ground there is the very
real possibility ( IE it HAS happened to me) for fuel to come out of the
vents on the ground.
John Marzulli
http://MarzulliPhoto.net/
http://701Builder.blogspot.com/
On Wed, Sep 19, 2012 at 4:25 PM, <NYTerminat@aol.com> wrote:
> **
> I am pretty sure those are the ones that I used. Use a tubing bender to
> prevent kinks in the tube.
>
> Bob Spudis
>
> In a message dated 9/19/2012 7:17:09 P.M. Eastern Daylight Time,
> craig@craigandjean.com writes:
>
> Wag-Aero sells a cap with the tube. It is delivered straight. You
> install it on your tank, clock it to the closed position and then bend th
e
> vent pipe to face forward. As I recall people =93tune=94 the pressure to
> prevent over-pressure by varying the angle of the forward-facing tube
> downward. The price of $38.95 seems high.****
>
> ** **
>
> Ram Air Pressure Cap, SKU: E-481-000****
>
> ** **
>
> http://store.wagaero.com/product_info.php?products_id=8107****
>
> ** **
>
> -- Craig****
>
> * *
>
> *
>
> ist href="http://www.matronics.com/Navigator?Zenith701801-List">http://
www.matronics.com/Navigator?Zenith701801-List
> s.matronics.com/">http://forums.matronics.com
> p://www.matronics.com/contribution">http://www.matronics.com/contribution
> *
>
> *
>
===========
>
===========
===========
===========
>
> *
>
>
Message 10
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| Subject: | Re: Left\Right Fuel Systems? |
John=C2-=0AThe Cessna 150's and 172's do the same thing.=0A=C2-There's
too much fuel in the tank. Heat of the day will also=C2-=0A=C2-expand t
he fuel volume, if re-fueled in the evening,=0A=C2-or early morning.=C2
-=0A=0ATry a little less fuel ...a gallon or two is all.=C2-=0AI doubt
valves, unless you put them in a vent line...(DON'T!) =C2-will help.=0A
=0ACharlie NJ=0A=0A=0A=0A>________________________________=0A> From: John M
arzulli <john.marzulli@gmail.com>=0A>To: zenith701801-list@matronics.com
=0A>Sent: Wednesday, September 19, 2012 7:44 PM=0A>Subject: Re: Zenith70180
1-List: Left\Right Fuel Systems?=0A> =0A>=0A>Thanks all for the input...=0A
>=0A>=0A>The main grip is really not uneven feeding during flight, it is th
e sloshing of fuel on the ground.=0A>=0A>=0A>If I fuel up for a long flight
and taxi on un-even ground there is the very real possibility ( IE it HAS
happened to me) for fuel to come out of the vents on the ground.=0A>=0A>Joh
n Marzulli=0A>=0A>http://MarzulliPhoto.net/=0A>http://701Builder.blogspot.c
om/=0A>=0A>=0A>=0A>On Wed, Sep 19, 2012 at 4:25 PM, <NYTerminat@aol.com> wr
ote:=0A>=0A> =0A>>I am pretty sure those are the ones that I used. Use a tu
bing bender to =0Aprevent kinks in the tube.=0A>>=C2-=0A>>Bob Spudis=0A>>
=C2-=0A>>In a message dated 9/19/2012 7:17:09 P.M. Eastern Daylight Time,
craig@craigandjean.com writes:=0A>>Wag-Aero sells a cap with the tube. It
is delivered straight. You install it on your tank, clock it to the close
d position and then bend the vent pipe to face forward. As I recall people
=9Ctune=9D the pressure to prevent over-pressure by varying t
he angle of the forward-facing tube downward. =C2-The price of $38.95 se
ems high.=0A>>>=C2-=0A>>>Ram Air Pressure Cap, SKU: E-481-000=0A>>>=C2
-=0A>>>http://store.wagaero.com/product_info.php?products_id=8107=0A>>>
=C2-=0A>>>-- Craig=0A>>>=C2-=0A>>>ist href="http://www.matronics.com
/Navigator?Zenith701801-List">http://www.matronics.com/Navigator?Zenith7018
01-List=0A>>>s.matronics.com/">http://forums.matronics.com p://www.matronic
s.com/contribution">http://www.matronics.com/contribution =0A>>ist" target
="_blank">http://www.matronics.com/Navigator?Zenith701801-List=0A>>tp://f
orums.matronics.com=0A_blank">http://www.matronics.com/contribution =0A>=0A
================= =0A>=0A>
Message 11
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| Subject: | Re: LeftRight Fuel Systems? |
I have been flying my 701 for 7 years, and have had my share of fuel feeding concerns.
I tried several tests with simulated fuel tanks, and found out that small
bubbles will clog the small 1/4 fuel line and cause one tank to feed, and
not the other. With a small tv camera, I found little bubbles on the finger screens
in the tanks. I replaced the Zenith gascolator, tried larger fuel lines,
tried extra venting etc.
After all of this, I settled on a system that works just fine. The two tank fuel
lines go to two valves in front of the pilot seat (poor man's left-right valve),
which connect to one hose that goes through the firewall to an Aircraft
Spruce gascolator, and then to the fuel filter and the engine. Am still able to
use the standard gas caps - never have water in my fuel - and am using a real
gascolator with a screen, and fuel management is no problem. I keep both valves
open until one tank gets lower than the other, and then just turn off that
tank for a while.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=383582#383582
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