Re: Europa-List: Re: Fuel Return Line

[Bud Yerly <budyerly@msn.com>]

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&amp;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


  Read this topic online here:


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