Matronics Email Lists :: View topic

Matronics Email Lists
Web Forum Interface to the Matronics Email Lists

Get Email Distribution Too! FAQ Search Memberlist Usergroups Register

Profile Log in to check your private messages Log in

Fuel pumps

Matronics Email Lists Forum Index -> Europa-List

View previous topic :: View next topic

Author Message

fklein(at)orcasonline.com
Guest

Posted: Sun Aug 23, 2009 7:52 am Post subject: Fuel pumps

Hi Guys...



After biting the bullet and ordering a RAM Performance Sube EA81  

derivative engine, I must now deal w/ aux. fuel pump selection...I've  

been planning on installing two for redundancy downstream from a  

single gascolator. Acft Spruce lists a number of different models of  

Facet fuel pumps.



	http://www.aircraftspruce.com/catalog/eppages/facetpumps.php



There's a notation at the bottom of the page stating that "the above"  

fuel pumps "do not feature an anti-siphoning valve and fuel will flow  

through them in event of pump failure". That would seem to indicate  

that if using two of them, they should be installed in series rather  

than parallel in order to avoid loss of fuel pressure by having the  

operative pump pumping fuel back thru the failed pump instead of to  

the engine. (I'm presuming that an anti-siphoning valve functions as a  

back flow preventer.)



I'd welcome comment on my reasoning and any suggestions on alternate  

brands of pumps.



Fred

- 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:

http://www.matronics.com/Navigator?Europa-List

frans(at)paardnatuurlijk.
Guest

Posted: Sun Aug 23, 2009 8:24 am Post subject: Fuel pumps

Fred Klein wrote:



 	  Quote: 	
		   There's a notation at the bottom of the page stating that "the above"

 fuel pumps "do not feature an anti-siphoning valve and fuel will flow

 through them in event of pump failure". That would seem to indicate that

 if using two of them, they should be installed in series rather than

 parallel in order to avoid loss of fuel pressure by having the operative

 pump pumping fuel back thru the failed pump instead of to the engine.


	


I would install them in the same way as recommended with the Europa

engine. That is, in series with two external one-way valves. The one-way

valves act as a bypass for the non-functioning fuel pump.

Why, you might ask, the fuel pumps flow through anyway? Well, if a fuel

pump is broken, you can't count on anything. Maybe just the motor gave

up the ghost, but it is also possible that a vane broke off and is now

blocking the stream, or the axle broke and the entire pump section

scattered in pieces, or something downstream of the filter got loose and

plugged the pump, or whatever. The fuel pump might let the fuel through,

but it might also not. If all this could never happen, you didn't need a

secondary fuel pump anyway. Just make sure that if you take one fuel

pump completely out of the equation, you can still get fuel to the engine.



Frans

- 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:

http://www.matronics.com/Navigator?Europa-List

fklein(at)orcasonline.com
Guest

Posted: Sun Aug 23, 2009 10:17 am Post subject: Fuel pumps

 	  Quote: 	
		   I would install them in the same way as recommended with the Europa

 engine. That is, in series with two external one-way valves. The one- 

 way

 valves act as a bypass for the non-functioning fuel pump.


	


Thanks Frans...sage advice as I've come to expect from you. I'll be  

doing further research w/ regard to desired pressures, etc.



BTW, how are you coming?...still looking for first flight this fall?



Fred

- 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:

http://www.matronics.com/Navigator?Europa-List

frans(at)paardnatuurlijk.
Guest

Posted: Sun Aug 23, 2009 12:41 pm Post subject: Fuel pumps

Fred Klein wrote:

 	  Quote: 	
		   Thanks Frans...sage advice as I've come to expect from you. I'll be

 doing further research w/ regard to desired pressures, etc.

 

 BTW, how are you coming?...still looking for first flight this fall?


	


Yep. Well, no, make it winter.  Next month the airplane will go to a

professional painter. Interior is already finished. I just have to go

through a long list with various small issues, but we are slowly getting

there.



Your wing root fairings are installed. Took me some headaches to do it

in such a way that the airplane can still be easily transported, that a

conversion to glider wings remains possible, and that the result is not

only airworthy but also pretty and functional. I think I succeeded in

that.  Will try to find some time to post some pictures.



Frans

- 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:

http://www.matronics.com/Navigator?Europa-List

Display posts from previous:

	Matronics Email Lists Forum Index -> Europa-List	All times are GMT - 8 Hours
Page 1 of 1

Jump to:

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum