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Fuel return

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madriver(at)wildblue.net
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Posted: Sun Sep 07, 2008 3:44 pm Post subject: Fuel return

I posted this a while back but did not get definitive answers.  The Rotax 912ULS I'm hanging on my CH-701 has a fitting on the top of the fuel rail that says "return line to tank"  in the Rotax installation manual.  Some have said just to block it off -  others said they plumbed it back to a "line from the tank".  I imagine that this line is to prevent fuel vaporization. I have installed a Spruce gascolator ahead of the firewall it has a 1/8 npt fitting in the top for "fuel primer".   Would it work to run a 1/4 hose to this fitting - I don't want to run another line back through the cockpit if I don't have to. Planning to use 91 octane mogas - field elevation is 4000ft with hot summers. 

   

 Thanks  Phil



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craig(at)craigandjean.com
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Posted: Sun Sep 07, 2008 4:18 pm Post subject: Fuel return

At least one of the 701s built at Quality Sport Planes ran the line back to a three port manifold on the people side of the firewall. I’ve attached a picture. Presumably there it mixed with cooler fuel coming from the tanks. I’ve attached a picture. Doug Dugger said the part came with the FWF kit from ZAC but that a similar part could be bought from Aircraft Spruce. Look under hardware->fittings->aluminum manifold fittings. I found a similar part at McMaster-Carr, p/n 5469K101 “ALUMINUM MANIFOLD, 2 OUTLETS, 1/4" NPT INLET X 1/8" NPT OUTLET”  

   

-- Craig

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ggower_99(at)yahoo.com
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Posted: Sun Sep 07, 2008 8:49 pm Post subject: Fuel return

Hello Phil,

  

 I am flying a 701 912S, from our strip at 5,000 ft ASL  and fly normaly up to 11,500 (legal limit is 12 here) in XCountry trips (yes my 701 IS a XCountry plane), temperature year round is normal to hot in summers,  normally no frezzing (sp?) temps in winter, just cold.

  

 We use only 93 oct fuel (Only brand available here in Mexico).  The return conection in our airplane is canceled,  No problem in 200 plus hours.    There are several airplanes (diferent brands and models) with 912 engines around here, some with return line some without it.  Never heard of any problem with the engines in that matter.

  

 I dont think there is alcohol in the gasoline here, only place to find some alcohol and Tequila is in the hangar talk time in the late afternoon and night.   

 

Hope this helps.

  

 Saludos

 Gary Gower.

 701 912S 

 601 XL Jab 3300 Building.

 

--- On Sun, 9/7/08, philip smith <madriver(at)wildblue.net> wrote:



  	  Quote: 	
		  From: philip smith <madriver(at)wildblue.net>

Subject: Fuel return

To: zenith701801-list(at)matronics.com

Date: Sunday, September 7, 2008, 7:43 PM



   I posted this a while back but did not get definitive answers.  The Rotax 912ULS I'm hanging on my CH-701 has a fitting on the top of the fuel rail that says "return line to tank"  in the Rotax installation manual.  Some have said just to block it off -  others said they plumbed it back to a "line from the tank".  I imagine that this line is to prevent fuel vaporization. I have installed a Spruce gascolator ahead of the firewall it has a 1/8 npt fitting in the top for "fuel primer".   Would it work to run a 1/4 hose to this fitting - I don't want to run another line back through the cockpit if I don't have to. Planning to use 91 octane mogas - field elevation is 4000ft with hot summers. 

  

 Thanks  Phil



 	  Quote: 	
		  

	


	


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b.carl@sympatico.ca

Joined: 20 May 2008
Posts: 77

Posted: Mon Sep 08, 2008 8:22 pm Post subject: Fuel return

Philip

 The purpose of running a fuel return line is to  bring fresh (read cool) fuel to the engine fuel system. A return to the engine  compartment gascolator would probably create a loop that would collect more heat  and increase susceptibility for vapour lock.

 Carl

  

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