Today's Message Index:
----------------------
1. 05:25 AM - Kitfox article (paul wilson)
2. 07:54 AM - Re: Re: Aux. electric fuel pump (Lowell Fitt)
3. 01:37 PM - Re: Aux. electric fuel pump (Roger Lee)
4. 02:33 PM - Re: Re: Aux. electric fuel pump (bob noffs)
5. 06:37 PM - Re: Re: Aux. electric fuel pump (Noel Loveys)
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http://www.aero-news.net/
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| Subject: | Re: Aux. electric fuel pump |
I have a question on this based on my own experience and the two
recommendations so far on this thread. I ran a 912 rather than the 582, but
had the Facet pump in series. At first, I used to run it on first start and
take off only because of the angle of attack and reduced head pressure to
the engine mounted pump. Then I got lazy and never used it except on one
instance when I had fuel flow issues due to too tight firesleeve clamps
impeding fuel flow and to test it from time to time. This was a very simple
system and I never had a hint of overpressure problems.
With a parallel aux pump, as I see it, you would need check valves to
prevent the aux pump from simply setting up a circular fuel flow around the
parallel lines. If you are worried about over pressure complications, in a
series set-up, why not simply put a pressure regulator between the engine
mounted pump and the carburetors. Much cleaner in my opinion and fewer
parts to give grief if something fails.
Or - what am I missing?
Lowell
--------------------------------------------------
From: "jridgway" <jridgway@academicplanet.com>
Sent: Monday, August 30, 2010 6:04 PM
Subject: Kitfox-List: Re: Aux. electric fuel pump
> <jridgway@academicplanet.com>
>
> probably should also add a pressure regulator after the "t" on the output
> side. I was told to set it at 4-5 lbs. Do not want to overpressure the
> float valves. Think there are other post on this issue..good luck..jack
> [Wink] [Wink] [Arrow] [Arrow]
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=310745#310745
>
>
>
Message 3
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| Subject: | Re: Aux. electric fuel pump |
Hi Harold,
Some main engine pumps don't do well with in series setups.
Rotax had problems with in series systems because of to high a pressure and flow(912).
This was one of the reasons they recalled a number of pumps. You are much
better off with it in parallel. The mechanical pump on the Rotax has been
working since late 1989 and on many planes without them and usually very reliable.
Many people with high wing aircraft don't even have aux. pumps. Check valves
are easy to come by and a good idea if you are set up in parallel. I have
had both types of planes with and without aux. fuel pumps. I never use them unless
there was a failure or an engine starting to quit. I would turn it on before
I started the first time during the day just to hear it run for a few seconds,
then just start on the engine fuel pump. I have also used these pumps as
fuel transfer pumps from an aux. tank to the main.The Faucet pump is probably
the most common. If you over pressure the system it will go past the needle valve
in the carbs and over flow out the vent tubes then into the airbox, air cleaner
or out to no where depending on how you have your system setup and how old
a system you have.
--------
Roger Lee
Tucson, Az.
Light Sport Repairman - Maintenance Rated
Rotax Repair Center
520-574-1080
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=310847#310847
Message 4
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| Subject: | Re: Aux. electric fuel pump |
a pressure regulator adds another failure point, so do check valves. i had a
pressure regulator in my series system. after finding out one of the failure
modes of the regulator was no flow at all i removed the regulator. i use a
series set up and i dont have any overflow issues . i did at first but
fiddled with spring pressure in the mech. pump and i have no problems now
and i think the series has the least failure points.
bob noffs
On Tue, Aug 31, 2010 at 9:50 AM, Lowell Fitt <lcfitt@sbcglobal.net> wrote:
>
> I have a question on this based on my own experience and the two
> recommendations so far on this thread. I ran a 912 rather than the 582, but
> had the Facet pump in series. At first, I used to run it on first start and
> take off only because of the angle of attack and reduced head pressure to
> the engine mounted pump. Then I got lazy and never used it except on one
> instance when I had fuel flow issues due to too tight firesleeve clamps
> impeding fuel flow and to test it from time to time. This was a very simple
> system and I never had a hint of overpressure problems.
>
> With a parallel aux pump, as I see it, you would need check valves to
> prevent the aux pump from simply setting up a circular fuel flow around the
> parallel lines. If you are worried about over pressure complications, in a
> series set-up, why not simply put a pressure regulator between the engine
> mounted pump and the carburetors. Much cleaner in my opinion and fewer
> parts to give grief if something fails.
>
> Or - what am I missing?
>
> Lowell
>
> --------------------------------------------------
> From: "jridgway" <jridgway@academicplanet.com>
> Sent: Monday, August 30, 2010 6:04 PM
> To: <kitfox-list@matronics.com>
> Subject: Kitfox-List: Re: Aux. electric fuel pump
>
>> >
>>
>> probably should also add a pressure regulator after the "t" on the output
>> side. I was told to set it at 4-5 lbs. Do not want to overpressure the float
>> valves. Think there are other post on this issue..good luck..jack
>> [Wink] [Wink] [Arrow] [Arrow]
>>
>>
>>
>>
>> Read this topic online here:
>>
>> http://forums.matronics.com/viewtopic.php?p=310745#310745
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>
>
Message 5
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| Subject: | Re: Aux. electric fuel pump |
Lowell:
I can't speak for the 912 but I do know that at least some C180/185's have
an electric auxiliary pump which autlmatically comes on when the throttle is
full open. There is also a switch to turn on the pump manually. The POH, I
believe, states to turn on the auxiliary pump for takeoff. That system is
definitely set up in series.
I wouldn't presume to say either parallel or series is better. I think the
series would be lighter and less complex because it wouldn't have multiple
feed lines and check valves. On the other hand if you are looking for
redundancy then a complete parallel system is the only way to go.
Noel
-----Original Message-----
From: owner-kitfox-list-server@matronics.com
[mailto:owner-kitfox-list-server@matronics.com] On Behalf Of Lowell Fitt
Sent: August 31, 2010 12:21 PM
Subject: Re: Kitfox-List: Re: Aux. electric fuel pump
I have a question on this based on my own experience and the two
recommendations so far on this thread. I ran a 912 rather than the 582, but
had the Facet pump in series. At first, I used to run it on first start and
take off only because of the angle of attack and reduced head pressure to
the engine mounted pump. Then I got lazy and never used it except on one
instance when I had fuel flow issues due to too tight firesleeve clamps
impeding fuel flow and to test it from time to time. This was a very simple
system and I never had a hint of overpressure problems.
With a parallel aux pump, as I see it, you would need check valves to
prevent the aux pump from simply setting up a circular fuel flow around the
parallel lines. If you are worried about over pressure complications, in a
series set-up, why not simply put a pressure regulator between the engine
mounted pump and the carburetors. Much cleaner in my opinion and fewer
parts to give grief if something fails.
Or - what am I missing?
Lowell
--------------------------------------------------
From: "jridgway" <jridgway@academicplanet.com>
Sent: Monday, August 30, 2010 6:04 PM
Subject: Kitfox-List: Re: Aux. electric fuel pump
> <jridgway@academicplanet.com>
>
> probably should also add a pressure regulator after the "t" on the output
> side. I was told to set it at 4-5 lbs. Do not want to overpressure the
> float valves. Think there are other post on this issue..good luck..jack
> [Wink] [Wink] [Arrow] [Arrow]
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=310745#310745
>
>
>
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