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Fuel System for 914

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wdaniell.longport(at)gmai
Guest

Posted: Wed Nov 06, 2013 12:50 pm Post subject: Fuel System for 914

My manual from 2003 (J)shows the fuel pumps for a 914 in parallel.  Does anyone know why the latest manual has pumps in series?

 

Thanks

 

Will

  [quote][b]

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jan_de_jong(at)casema.nl
Guest

Posted: Wed Nov 06, 2013 2:41 pm Post subject: Fuel System for 914

I believe it makes pressure regulation easier. Pressure regulation     works by returning not needed flow (that is most of the forward     flow) to the tank.

     With pumps in parallel the second pump doubles the flow which     requires quick action from the regulator; also, the maximum pressure     drop in the return line (0.25 bar?) is easily exceeded . With pumps     in series the second pump does almost nothing (except double the     maximum attainable pressure at no flow condition - not relevant -     and making it doubly certain that the required flow is there).

     

     Jan de Jong

     

     On 11/6/2013 9:49 PM, William Daniell       wrote:

     

     [quote]                       <![endif]-->   <![endif]-->                

My manual from 2003 (J)shows the fuel pumps for a 914 in parallel.              Does anyone know why the latest manual has pumps in series?         

          

Thanks         

          

Will       

     [b]

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wdaniell.longport(at)gmai
Guest

Posted: Thu Nov 07, 2013 8:07 am Post subject: Fuel System for 914

Thanks jan

Yours

Will

 

From: owner-europa-list-server(at)matronics.com [mailto:owner-europa-list-server(at)matronics.com] On Behalf Of Jan de Jong

Sent: Wednesday, November 06, 2013 17:41

To: europa-list(at)matronics.com

Subject: Re: Fuel System for 914

 

I believe it makes pressure regulation easier. Pressure regulation works by returning not needed flow (that is most of the forward flow) to the tank.

With pumps in parallel the second pump doubles the flow which requires quick action from the regulator; also, the maximum pressure drop in the return line (0.25 bar?) is easily exceeded . With pumps in series the second pump does almost nothing (except double the maximum attainable pressure at no flow condition - not relevant - and making it doubly certain that the required flow is there).



Jan de Jong

On 11/6/2013 9:49 PM, William Daniell wrote:



  [quote][b]

- The Matronics Europa-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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