Today's Message Index:
----------------------
1. 06:11 AM - Re: Matronics Web Services Restored! ()
2. 08:10 AM - Re: Auto Aux Fuel Pump Circuit Idea (jonlaury)
3. 08:36 AM - Re: Auto Aux Fuel Pump Circuit Idea (jonlaury)
4. 11:49 AM - Re: Auto Aux Fuel Pump Circuit Idea (Bill & Sue)
Message 1
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| Subject: | Re: Matronics Web Services Restored! |
Thanks Matt.
Rumen
do not archive
---- Matt Dralle <dralle@matronics.com> wrote:
>
> Dear Listers,
>
> I'm extremely happy to report that as of about 9pm PST 12/7, all of the Matronics
web services have been fully restored including the Web Forums, List Browse,
Archive Search, Wiki, and AeroElectric web sites. It was quite an ordeal
getting the replacement boards for the server, but things went back together tonight
and are up and running nicely. The first company I ordered the boards
from originally called me a day later to say that, whoops, they really didn't
have them in stock after all... Fortunately, I was able to locate some through
a different source and had then over-nighted and they arrived today.
>
> Thank you for your patience and consideration though the whole thing!
>
> The List Contribution web site is also back on line for those wishing to make
a donation to the effort:
>
> http://www.matronics.com/contribution
>
> Best regards,
>
> Matt Dralle
> Matronics List Administrator
>
>
>
>
>
>
Message 2
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| Subject: | Re: Auto Aux Fuel Pump Circuit Idea |
FWIW, I am running a Simple Digital Systems EFI on my Franklin powered Glasair.
I modified the Glasair fuel system to provide gravity pressure to two electric
fuel pumps (with integral check valves) under all positive G conditions.
A sump tank (1 qt) was squeezed between the belly pan and the wing bottom. The
header tank and wing tanks feed the sump tank. Check valves are installed between
the wing tanks and sump. The pumps are at the aft end of the sump tank and
push fuel through a FW mounted filter then to the fuel rail, to the pressure
regulator and back to the header tank.
Within the header is a dam to within 3/4" of ceiling of the header, creating a
1 gal. capacity dry space.On the dry side of the dam, outside vent air (2) is
supplied and wing tank vents and sump tank purge vent are near the top of the
dam. At the bottom of the dry side, drain lines back to the mains are installed
so that any fuel over the dam from recirculated fuel and a topped off header
returns to the wing tanks.
Normal ops is to leave the header open to feed the sump tank, then select a wing
tank R, L, or both. With header open and wing tanks on both, the system accesses
total tankage. As angle of attack is increased, the header tank rises
relative to the sump tank increasing gravity pressure at the pump intake. If desired
for CG reasons, the header only or wing only may be selected.
The system pressure is 40 psi. The pumps draw 3.5-4 amps each and deliver 20 gph
each. Both on delivers 28 gph. One pump is on the main bus, one on the battery
bus.
The system has not been flown, but operates as expected in all conceivable +/-
AOA.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=360456#360456
Message 3
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| Subject: | Re: Auto Aux Fuel Pump Circuit Idea |
aerobubba(at)earthlink.ne wrote:
> Hi All-
>
>
>
> Another data point is that when the automotive, tank mounted pump fails, you
coast over to the side of the road. It's a little more complicated when the pump
in a pump dependent aircraft fuel system quits.
> Glen Matejcek
My queries and investigations into automotive hi pressure fuel pump failures revealed
that a fuel pump rarely has an abrupt total failure. The gearotor and vane
type premature failure of the pump mechanism itself is from dirty fuel. Motor
failure is age/time related the same as any certified, mechanical/electric
AC fuel pump. The symptoms of impending failure of automotive fuel pumps are
the same...falling pressure/increase amperage draw. But people being the fallible
monitoring system that they are, is the reason for redundant essential systems.
Anecdotally, I have never experienced an automotive fuel pump failure inspite of
two Toyota trucks, a Ford Taurus, a Ford truck and a MBZ sedan being driven
over 1,000,000 miles.
John
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=360462#360462
Message 4
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| Subject: | Re: Auto Aux Fuel Pump Circuit Idea |
Here in the UK Nigel Charles published what I thought was an elegant (and LAA approved)
modification for the Europa with its main and reserve feeds to a Rotax
engine running on Mogas.
The essence of the mod was to remove the mechanical fuel pump and use two electrical
pumps, one fed from the main tank and one from the reserve.
By sensing the fuel pressure, when the fuel pressure dropped (i.e. when the tank
ran empty or was blocked) the reserve pump was switched on automatically and
illuminating a light on the panel.
I've seen it, it works, and by all accounts seamlessly, changing over without so
much as a cough.
Using this system, and insulating the fuel lines in the engine bay, Nigel was also
able to avoid vapor lock with sufficient confidence to eliminate the need
for a return fuel line to the tank.
Bill
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=360474#360474
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