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Rotax 912 Fuel Pump Inlet/Outlet

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Tommy Walker

Joined: 12 Jan 2006
Posts: 442
Location: Anniston, AL 36207

Posted: Sat Nov 11, 2006 2:44 pm Post subject: Rotax 912 Fuel Pump Inlet/Outlet

Edited 11/11/2006 by T Walker



After reading this, it didn't make sense to me so I am going to try to clarify it.

"...The intake side of the mechanical fuel pump is a 5/16" nipple.  The output side is 1/4".  The fuel line supplied by Zenith is 1/4" for the entire system.

 

What have others used for the fuel line. 1/4 or 5/16?   All the connectors into and out of the gascolator are 1/4.

 

I guess what I'm wondering about is why would a 5/16 line make a difference in a 1/4 system?...."

 



912'ers,



I am plumbing up my fuel lines and have run into a problem with the ZAC supplied fuel lines, connectors, etc.  I thought someone who has been there/done that, would be a good solution (I also emailed Support(at)zenithair.com).  The inlet side of the fuel pump is a 5/16 nipple and the outlet side is a 1/4 nipple.  All the material I got in my kit is for a 1/4 plumbing scheme.  I'm wondering what some of you did to your lines when you plumbed the fuel system.



Thanks,



Tommy Walker in Alabama

Do Not Archive

N8701

80% done  50% to go.

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_________________
Tommy Walker
N25A - Anniston, AL

Last edited by Tommy Walker on Sat Nov 11, 2006 4:49 pm; edited 1 time in total

webmaster(at)upac.ca
Guest

Posted: Sat Nov 11, 2006 3:47 pm Post subject: Rotax 912 Fuel Pump Inlet/Outlet

Tommy, the only thing I did to my lines to and from the pump was to cover them in firesleeve to prevent the fuel from boiling and causing vapour lock. It can get pretty hot under that cowl.



 

Trevor Page 

UPAC Webmaster 

www.upac.ca  



On Nov 11, 2006, at 5:44 PM, Tommy Walker wrote:

[quote]--> Zenith-List message posted by: "Tommy Walker" <twalker(at)cableone.net (twalker(at)cableone.net)>

912'ers,

I am plumbing up my fuel lines and have run into a problem with the ZAC supplied fuel lines, connectors, etc.  I thought someone who has been there/done that, would be a good solution (I also emailed Support(at)zenithair.com (Support(at)zenithair.com)).  The inlet side of the fuel pump is a 5/16 nipple and the outlet side is a 1/4 nipple.  All the material I got in my kit is for a 1/4 plumbing scheme.  I'm wondering what some of you did to your lines when you plumbed the fuel system.

Thanks,

Tommy Walker in Alabama

Do Not Archive

N8701

80% done  50% to go.

--------

Tommy Walker

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NYTerminat(at)aol.com
Guest

Posted: Sat Nov 11, 2006 5:07 pm Post subject: Rotax 912 Fuel Pump Inlet/Outlet

Tommy, 

 I changed at the firewall from 1/4" to 5/16" using brass fittings. Then I  went into the filter (Skyshops supplied a 5/16" filter) then I went to the inlet  of the fuel pump. I also covered my lines in firesleeve. I'll send you a picture  directly.

  

 Bob Spudis

 N701ZX

  

  

 In a message dated 11/11/2006 6:48:22 P.M. Eastern Standard Time,  webmaster(at)upac.ca writes:

  	  Quote: 	
		  Tommy,    the only thing I did to my lines to and from the pump was to cover them in    firesleeve to prevent the fuel from boiling and causing vapour lock. It can    get pretty hot under that cowl.    

   

      

Trevor Page   

UPAC Webmaster   

www.upac.ca



      On Nov 11, 2006, at 5:44 PM, Tommy Walker wrote:

    	  Quote: 	
		       --> Zenith-List message posted by: "Tommy      Walker" <twalker(at)cableone.net (twalker(at)cableone.net)>

     



     912'ers,

     



     I am plumbing up my fuel lines and have run into a      problem with the ZAC supplied fuel lines, connectors, etc.  I thought someone who has been      there/done that, would be a good solution (I also emailed Support(at)zenithair.com (Support(at)zenithair.com)).  The inlet side of the fuel pump is      a 5/16 nipple and the outlet side is a 1/4 nipple.  All the material I got in my kit      is for a 1/4 plumbing scheme.       I'm wondering what some of you did to your lines when you plumbed the      fuel system.

     



     Thanks,

     



     Tommy Walker in Alabama

     Do Not Archive

     N8701

     80% done       50% to go.

     



     --------

     Tommy  Walker

	




	


 

  

  [quote][b]

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RURUNY(at)aol.com
Guest

Posted: Sat Nov 11, 2006 6:35 pm Post subject: Rotax 912 Fuel Pump Inlet/Outlet

Tommy,

  

 I have the main and aux tanks for my 701. I have 1/4 inch hose from the  tanks to the 

 gascolaters mounted behind the seat, one for inboard tanks and the other  for outboard tanks.

 Since the 912 pump input is 5/16 I figured I'd just make everything 5/16  from the outlet of these gascolaters.This makes 2 1/4 inch lines feeding 1  5/16 line right up to that fuel pump. I switched all brass fittings with  5/16 ones from McMaster  Carr (catalog page 239). They sell them in 10 packs or 5 packs  depending on if they are straight, right angle or 45 deg. They are relatively  inexpensive, and you can get them in 1/4 or 1/8 npt depending on what you need.   I come out of the gascolaters(1/8 npt) into the fuel selector(2  right angle 1/4 npt) just in front of the pilots seat. Output of  selector is 45 deg 1/4 npt.Then into a 10 micron 6061-T6 aluminum

 filter with 5/16 barbs built into it only 6 inches away from the selector.  I run up the left side with 5/16 line purchased from Wicks  Aircraft goodyear 30R7 to a Facet  10405 aux pump in

 front of the rudder pedals mounted on the floor. The facet input is a right  angle 5/16 1/4 npt fitting and the output is a strait one. Then into a fuel flow  sensor for my GRT EIS with strait fittings. Then thru the firewall via an  ACS  Gascolater. The output of the gascolater has a 5/16 right angle 1/4 npt and  the input has a strait fitting. Then on up and over to the 5/16 mechanical fuel  pump input. I am using firesleeve on the 5/16 and 1/4 hose firewall  forward. I did not get any 5/16 fittings from Zenith or any 5/16  hose.

 This is probably more info than what you needed but I'm just putting this  out there for others and if anyone has a problem with this let me know.

  

 Brian

  

  [quote][b]

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lgold(at)quantum-associat
Guest

Posted: Sat Nov 11, 2006 7:57 pm Post subject: Rotax 912 Fuel Pump Inlet/Outlet

Bob, Could you please  also send me your firewall pics.

 Thanks

   Les  Goldner

 Berkeley, CA  94705

 lgold(at)quantum-associates.com (lgold(at)quantum-associates.com)

 (701 builder, starting on the  fus next month)



 [quote]         From: owner-zenith-list-server(at)matronics.com    [mailto:owner-zenith-list-server(at)matronics.com] On Behalf Of    NYTerminat(at)aol.com

Sent: Saturday, November 11, 2006 5:07    PM

To: zenith-list(at)matronics.com

Subject: Re: Zenith-List:    Rotax 912 Fuel Pump Inlet/Outlet

   

      Tommy, 

   I changed at the firewall from 1/4" to 5/16" using brass fittings. Then I    went into the filter (Skyshops supplied a 5/16" filter) then I went to the    inlet of the fuel pump. I also covered my lines in firesleeve. I'll send you a    picture directly.

    

   Bob Spudis

   N701ZX

    

    

   In a message dated 11/11/2006 6:48:22 P.M. Eastern Standard Time,    webmaster(at)upac.ca writes:

    	  Quote: 	
		  Tommy,      the only thing I did to my lines to and from the pump was to cover them in      firesleeve to prevent the fuel from boiling and causing vapour lock. It can      get pretty hot under that cowl.      

     

          

Trevor Page     

UPAC Webmaster     

www.upac.ca



          On Nov 11, 2006, at 5:44 PM, Tommy Walker wrote:

      	  Quote: 	
		         --> Zenith-List message posted by: "Tommy        Walker" <twalker(at)cableone.net (twalker(at)cableone.net)>

       



       912'ers,

       



       I am plumbing up my fuel lines and have run into        a problem with the ZAC supplied fuel lines, connectors, etc.  I thought someone who has been        there/done that, would be a good solution (I also emailed Support(at)zenithair.com (Support(at)zenithair.com)).  The inlet side of the fuel pump        is a 5/16 nipple and the outlet side is a 1/4 nipple.  All the material I got in my kit        is for a 1/4 plumbing scheme.         I'm wondering what some of you did to your lines when you plumbed        the fuel system.

       



       Thanks,

       



       Tommy Walker in Alabama

       Do Not Archive

       N8701

       80% done         50% to go.

       



       --------

       Tommy    Walker

	




	


   

    

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Tommy Walker

Joined: 12 Jan 2006
Posts: 442
Location: Anniston, AL 36207

Posted: Sun Nov 12, 2006 3:55 pm Post subject: Re: Rotax 912 Fuel Pump Inlet/Outlet

All,



Thanks for the responses, on list and off.  I amazed at how much everyone else knows and how little I know.



Tommy Walker in Alabama

Do Not Archive



"It takes a village to build Tommy's Airplane...."

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Tommy Walker
N25A - Anniston, AL

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