Today's Message Index:
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1. 01:12 AM - Re: Re: Fuel pumps in series can get blocked (BEBERRY@aol.com)
2. 06:45 AM - Re: Re: Fuel pumps in series can get blocked (Paul McAllister)
3. 07:27 AM - Re: Re: AW: Re: 914 Fuel System (RK Hallett III)
4. 07:29 AM - Re: Re: Fuel pumps in series can get blocked (RK Hallett III)
5. 08:29 AM - Re: Fuel pumps in series can get blocked (europa flugzeug fabrik)
6. 09:15 AM - Re: Re: Fuel pumps in series can get blocked (Paul McAllister)
7. 09:36 AM - Re: Re: Fuel pumps in series can get blocked ()
8. 10:42 AM - UK - trailer for Classic mono wanted. (Pete Lawless)
Message 1
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Subject: | Re: Fuel pumps in series can get blocked |
--> Europa-List message posted by: BEBERRY@aol.com
I am really learning about fuel pumps and pressures etc (I think) and wonder
if anyone can comment on the problem I have with getting a smooth running
engine at RPM below about 3600 on my 914. Could it be overmuch fuel pressure
and carb flooding with both pumps on in my parallel system? On the other hand
when doing test engine ground runs I have the pumps, filters etc in view and
there is always only one pump fully working as witness the amount of fuel
flowing through the transparent filter barrels..
Going back to some recent discussions on filters and accumulation of grot.
A good while ago I removed a huge amount of stuff from my carbs and jets,
none of which had been trapped by the filters which were as clean as a whistle.
With my briefish experience of the Rotax I find this curious.
Patrick
Message 2
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Subject: | Re: Fuel pumps in series can get blocked |
--> Europa-List message posted by: "Paul McAllister" <paul.mcallister@qia.net>
Fred,
The standard Europa design has the fuel return coming in at the bottom of
the tank. I made my system return the fuel into the top of the tank via a
1/4" aluminum line. I found in my setup with parallel pumps that I did not
did not exceed the maximum return fuel pressure as specified by Rotax.
Paul
Message 3
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Subject: | Re: AW: RE: 914 Fuel System |
--> Europa-List message posted by: RK Hallett III <n100rh@sbcglobal.net>
Actually Dave sent me a picture of South Lake Tahoe, taken from his MG
while at more than 20,000 feet. Dave isn't following this site any
longer, but I can fwd questions on to him if you like.
Ralph
RK Hallett III
Reno,NV
Vaughn & Gaye Teegarden wrote:
> --> Europa-List message posted by: "Vaughn & Gaye Teegarden" <N914VA@starband.net>
>
> Dan
>
> "If not, do you know of anyone that is flying at these high altitudes with
> the 914 and what configuration they are using?"
>
>
> Dave Anderson is flying his XS 914 with glider at 17,000'. He used to have a
> web page with his build log, but I haven't looked for it lately so I will
> have to. Formerly it could be accessed from the Europa site somehow.
>
> Vaughn Teegarden
> ============================================================
>
>>
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Message 4
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Subject: | Re: Fuel pumps in series can get blocked |
--> Europa-List message posted by: RK Hallett III <n100rh@sbcglobal.net>
Paul,
Makes perfect sense. This way you aren't returning back against the
hydrostatic pressure of all the fuel in the tank.
Ralph
RK Hallett III
Reno,NV
Paul McAllister wrote:
> --> Europa-List message posted by: "Paul McAllister" <paul.mcallister@qia.net>
>
> Fred,
>
> The standard Europa design has the fuel return coming in at the bottom of
> the tank. I made my system return the fuel into the top of the tank via a
> 1/4" aluminum line. I found in my setup with parallel pumps that I did not
> did not exceed the maximum return fuel pressure as specified by Rotax.
>
> Paul
>
>
>
>
>
>
>
>
Message 5
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Subject: | Re: Fuel pumps in series can get blocked |
--> Europa-List message posted by: "europa flugzeug fabrik" <n3eu@comcast.net>
n100rh(at)sbcglobal.net wrote:
> Makes perfect sense. This way you aren't returning back against the hydrostatic
pressure of all the fuel in the tank.
If the return line still runs along the floor, I was assuming that the head pressure
would be identical -- full tank vs. upward push in the return line. Partial
tank; we're in the hole. However, I can just about remember what my Physics
101 prof looked like! Whatever works, though, I always say.
Best would be the routing return line back along the fuselage side, thence to tank
top. That one I'm pretty sure of... [Wink]
Reg,
Fred F..
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=14666#14666
Message 6
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Subject: | Re: Fuel pumps in series can get blocked |
--> Europa-List message posted by: "Paul McAllister" <paul.mcallister@qia.net>
Fred,
Mine runs through the firewall along the side of the fuselage under the
window still and into the tank. It never gets to run uphill.
Paul
Message 7
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Subject: | Re: Fuel pumps in series can get blocked |
--> Europa-List message posted by: <rparigor@suffolk.lib.ny.us>
Quick note on parallel vs series.
In parallel, if 1 pump destroys itself, and some debris jams the 1 way
valve in the pump opened, the other pump, although may be perfectly
functional may not create enough pressure to prevent the playing of silent
night.
Has anyone actual had a pump 1 way fail opened?
Like someone mentioned a Andair or similar 1 way in series with each pump
output could help with both pumps, or one 1 way not allowing back feed
from the aux pump back through main.
Not going to help the excess pressure though.
One thing I noticed on my build is that all fittings are not created
equal. Some have smaller internal holes than other. This for certain can
cause restriction on 914s where flow rates can be 40gph plus. I chose
fittings or bored so restriction held to minimum.
Paul it would be interesting to see if your lack of a too high
differential fuel pressure with both pumps on are in fact because of not
returning to bottom of tank, or because of lack of restriction in return
line??
The thicker the air, the greater the return pressure should be.
Ron Parigoris
Message 8
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Subject: | UK - trailer for Classic mono wanted. |
--> Europa-List message posted by: "Pete Lawless" <pete@lawless.info>
Hi All
I am looking to buy a second hand factory, or similar, trailer for my
Europa Classic monowheel. I have just sold my Schofield trailer as the
aeroplane is hangered, but do feel the need to have a trailer available
to move the aeroplane by road should it be necessary.
Please contact me off Forum with age and price
Thanks
Pete Lawless
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