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Re: Europa-List: Fuel return line one-way-valve

Subject: Re: Europa-List: Fuel return line one-way-valve
From: Raimo Toivio <raimo.toivio@rwm.fi>
Date: Mon, 16 Sep 2013 21:49:14
Hi Ron,

I try to elaborate this a bit:

Think what happen if you will get a leak to this line. Return fuel is 
then coming out from engine as well as direct from the tank by gravity. 
Remember =93 if installed as per manual =93  a fuel return 
line is connected to the reserve side bottom of the tank.

Even worse scenario: during succesful forced landing your ac will suffer 
minor damages to the fire wall etc. Before landing you have closed as 
per POH your fuel valve but you have no valve in the fuel return line. 
If it is broken your tank will go empty under you. Maybe you are not 
able to escape in time. How is then sitting as jammed in the ac, 
listening fuel splitting out and waiting the possible flames? 

Of course it is possible to have also a manual fuel valve in the return 
line also. Intead of that one-way-valve is automatic and works well if 
located as close as possible from the tank.

Before installing my one-way-valve I closed the entire fuel return line 
and I did not noticed any difference (there is a risk for a vapour lock 
/fire upp engine difficulties when semi warm and reserve side of the 
tank is then also not refreshed ie. always full).

If I were building now, I would like to instal the fuel return line 
joint to the top of the tank instead of the bottom of it. That=C2=B4s 
bad only if you are inverted...and damaging the ac same time.

How was my elaboration?


Cheers, Raimo Toivio


Europa XS Mono OH-XRT #417

Updated flight hours /landings: 376 /604

(no damaged props so far)

37500 Lempaala
FINLAND

p +358-3-3753 777
f +358-3-3753 100

www.rwm.fi


From: rparigor@suffolk.lib.ny.us 
Sent: Friday, September 06, 2013 5:21 AM
Subject: Re: Europa-List: Fuel filters

Hi Raimo

You mentioned:

Notice:

- Adding one-way-valve to the fuel return line
(idea by Frans Veldman) is a great must (and
mandatory at least for me).
Can you elaborate a little on why you might want to put a one-way-valve 
on the fuel return line? Is this for a 914 fuel system?

Thx.

Ron Parigoris



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