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701 Fuel System with Rotax 912S

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txpilot

Joined: 26 Feb 2007
Posts: 87
Location: Houston, TX

Posted: Mon Oct 08, 2007 8:07 am Post subject: 701 Fuel System with Rotax 912S

I have a couple questions regarding the fuel system.  According to the Rotax installation manual, a return line is required from the fuel manifold back to the fuel tank.  I spoke with ZAC about this since the 701 plans make no mention of this return line.



They said the return line is not necessary if you're running 100LL because of the reduced chance of vapor lock.  Although I plan on running only 100LL, I'm wondering if any other builders are installing a return fuel line.  If there are builders installing return lines, do you go to a wing tank or to the gascolator?



I spoke with my EAA tech adviser and he wasn't sure.  He did make another suggestion:  use stainless steel fuel lines instead of the supplied 1/4" rubber hose.  That leads me to another question for the forum:  are there any builders experiencing problems with their rubber hose fuel lines, or are stainless steel fuel lines an overkill?



Thanks,



Dan Ginty

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gfmjr_20(at)HOTMAIL.COM
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Posted: Mon Oct 08, 2007 1:02 pm Post subject: 701 Fuel System with Rotax 912S

Dan--

   Many rotax engines are run without a return line.  The major reason for the return line is to help avoid vapor lock when using autogas.  I did install a return line in the system on my 601xl because I mostly use autofuel. If you usage of auto fuel is minimal, I'd skip the return line.

    You can ever go wrong using the stainless steel line in the engine compartment, but I personally think it is overkill for the mission of our planes.  The rubber fuel line will suffice and if in doubt about they can be relatively easily changed out every couple of years

  

 George May

 601xl 912s  162 hrs



 	  Quote: 	
		   Subject: 701 Fuel System with Rotax 912S

 From: djg7(at)comcast.net

 Date: Mon, 8 Oct 2007 09:07:07 -0700

 To: zenith-list(at)matronics.com

 

 --> Zenith-List message posted by: "txpilot" <djg7(at)comcast.net>

 

 I have a couple questions regarding the fuel system. According to the Rotax installation manual, a return line is required from the fuel manifold back to the fuel tank. I spoke with ZAC about this since the 701 plans make no mention of this return line.

 

 They said the return line is not necessary if you're running 100LL because of the reduced chance of vapor lock. Although I plan on running only 100LL, I'm wondering if any other builders are installing a return fuel line. If there are builders installing return lines, do you go to a wing tank or to the gascolator?

 

 I spoke with my EAA tech adviser and he wasn't sure. He did make another suggestion: use stainless steel fuel lines instead of the supplied 1/4" rubber hose. That leads me to another question for the forum: are there any builders experiencing problems with their rubber hose fuel lines, or are stainless steel fuel lines an overkill?

 

 Thanks,

 

 Dan Ginty

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=138777#138777

 

 

 

 

 

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