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kaarsberg(at)terra.com.br
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 Posted: Fri Nov 02, 2012 6:05 am Post subject: [Spam] Re: Re: Fuel Return Line |
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I would expect return pressure to depend on the height to which it is pushed, ie the height of the surface or opening.
Exit to top of tank will provide equal (in average higher) back pressure than if return is at the bottom, all other parameters being equal...
Alex, kit 529
Enviado via iPhone
Em 01/11/2012, às 23:32, GRAHAM SINGLETON <grahamsingleton(at)btinternet.com (grahamsingleton(at)btinternet.com)> escreveu:
| Quote: |
Jim
I have always put the fuel return into the top of the tank, (I used a redesigned tank fitting that incorporated the breather connection (3/8 aluminum)
fuel return and sight gauge return connection. Much less back pressure at the top of the tank and the (maybe hot from the engine driven pump)
then mixes with the main bulk of the tank contents before going baCK TO THE ENGINE. sorry kaps lok again!
Graham
From: "h&jeuropa" <butcher43(at)att.net (butcher43(at)att.net)>
To: europa-list(at)matronics.com (europa-list(at)matronics.com)
Sent: Thursday, 1 November 2012, 19:45
Subject: Re: Fuel Return Line
--> Europa-List message posted by: "h&jeuropa" <butcher43(at)att.net (butcher43(at)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’t 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
Read this topic online here:
http://forums.matronicsease Support ref="http://www.matronics.com/contribution">http://www.matronics.com/contbsp; -Matt Dralle, List Admin. --> http://www.matronics.com/Navigator?Europa-Listhttp://forums.matronics.com
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<Europa breather system sketch copy.jpg>
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Remi Guerner
Joined: 14 Dec 2010
Posts: 284
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| Posted: Sat Nov 03, 2012 2:36 am Post subject: Re: [Spam] Re: Re: Fuel Return Line |
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Alex,
In my opinion it depends on what fluid you are returning. You are right if 100 per cent liquid fuel is returned. Now if 100 percent vapor is returned, returning to the top of the fuel tank will significantly reduce the back pressure. Because one of the most important function of the return line is to allow vapor to escape the fuel system, therefore preventing potential vapor lock, I believe returning to the top of the tank is a better option.
Remi Guerner
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