Today's Message Index:
----------------------
1. 02:02 AM - Re: Re: Reserve Fuel (Duncan & Ami)
2. 04:19 AM - [Spam] [Spam] Re: Fuel Return Line (Remi Guerner)
3. 08:32 AM - Re: Re: Fuel Return Line (Bud Yerly)
Message 1
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| Subject: | Re: Reserve Fuel |
<<..But it worth checking that the fuel return is happening.>>
Yes, that should be on the annual checklist. Alternately, if you have a
fuel
pressure sensor fitted the action of the return can be checked at every
shut
down, by watching fuel pressure return quickly back to zero. Without the
return, the pressure would be locked-in to the fuel lines (unless the
fuel
pump valve and/or float valves leak!).
Duncan McF.
-----Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of
roddyeuropa@aol.com
Sent: 25 October 2012 09:55
Subject: Re: Europa-List: Re: Reserve Fuel
Hi Alan
I'd add a couple of things - you have the fuel drain mod installed which
is
good. But be aware that you need to drain more fuel than a normal fuel
drain
to clear the fuel in the lines between the drain and the tank. I drain
about
'half jam jar' each side.
Also, the fuel return from the engine should be feeding into the
reserves
side so it should refresh the fuel. But if fueling the plane doesn't get
to
the bottom of the tank to stir things up, the return flow certainly
won't.
But it worth checking that the fuel return is happening.
Regards
Roddy Kesterton
G-IKRK
-----Original Message-----
From: Alan Carter <alancarteresq@onetel.net>
Sent: Thu, 25 Oct 2012 8:56
Subject: Europa-List: Re: Reserve Fuel
<alancarteresq@onetel.net>
Hi Tim.
NZ a beautiful county i had a holiday there.
I have done my time on Chipmunks, My Europa is a Mono to Tri Conversion
so maybe better! well a lot easier.
The Fuel/Tables were done with the aircraft just in its level position
on
level
ground, a couple of litres either way i am not bothering about as if i
was
down
to 15 litres i would be quit worried.
Glad you use the reserve fuel, just my choice taxing in on reserve,
I like your idea of the extended lever, is it guarded or recessed, can
you
give
some more on how to do it.
Alan
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Message 2
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| Subject: | Re: [Spam] [Spam] Re: Fuel Return Line |
Alex,
Varying pressure in the return line may affect the fuel pressure to the carbs,
but as long as this fuel pressure stays within the limits specified by Rotax,
it should not affect the mixture.
Remi
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Message 3
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| Subject: | Re: Fuel Return Line |
Jim,
Never had a problem with return pressure as rigged. The Rotax manual
says it is supposed to be a minimum of back pressure as you indicated.
If you restrict the return pressure, you actually overpressurize the
fuel system. Those with gauges that read raw fuel pressure can test
this easily, by just clamping the return line just slightly with the
engine off and not the rapid rise in pressure.
You are very wise to note that the column pressure is only about 1/2
psi. in the full tank. I cannot blow more than 1.5 PSI when checking
against my fuel direct reading manual gauge. Check for kinks and
plugged vents also.
Off until Friday.
Hope you find out what the matter is. It must be something simple, as
it is hard to find.
Regards
Bud Yerly
----- Original Message -----
From: h&jeuropa<mailto:butcher43@att.net>
To: europa-list@matronics.com<mailto:europa-list@matronics.com>
Sent: Thursday, November 01, 2012 2:45 PM
Subject: Europa-List: Re: Fuel Return Line
<butcher43@att.net<mailto:butcher43@att.net>>
While trying to understand our recent 914 power problems, we talked to
Rob Seaton at Rotech.
He suggested we measure how much pressure is required to return the
fuel to the tank (from regulator). Remove return hose from top of
regulator, plug one side of banjo fitting and blow into other (don?Tt
ingest fuel!). it should be very easy (max is 1.5 PSI pressure loss with
both pumps on: 914 installation manual sec 14.3)
We found with the fuel tank full the pressure required was more than
we could easily blow. With the tank half empty not much pressure was
required. Our system is per Europa with the return at the bottom of the
tank. Calculations show the pressure of the column of fuel in a full
tank (15 inches of fuel) is about .4 psi which is certainly less than
1.5 psi.
The Europa setup has worked OK for over 400 hours, but perhaps it
would be better to return the fuel to the top of the tank. Opinions?
Jim & Heather
N241BW
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