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Introduction and Fuel Systems (trying to keep it brief!)

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zuluonecat

Joined: 12 Jul 2006
Posts: 4
Location: Thailand

Posted: Sun Jul 16, 2006 6:21 am Post subject: Introduction and Fuel Systems (trying to keep it brief!)

Hi list, I've been quietly reading this great forum for a while now, time for me to introduce myself!  Name: Chris, Plane: Zodiac 601UL/912 where: Thailand, Eastern Seaboard.  As far as I and the Zenair man know, this is the only flying 601 in Thailand at the moment.  I purchased this aircraft a few years ago, from a closed airfield where it sat for 6 years unused, and freshened it up with a new panel, cowl, and everything else to get it airworthy again, it flew on August last year, and has been performing well.  It's an early Czech built 'quick build' kit I believe. (serial 7001)

My question regards the fuel system, I've read all the posts I can find about this, but would like a bit of fresh advice if possible.  Big centre tank (60L) with flexible hose to a centre console on-off valve, and down to the firewall mounted Zenair sump/drain, flexible hose up to a firewall mounted Facet boost pump, up to an aircraft inline fuel filter, to the mechanical pump, back to a 'T' for the carbs (Rotax 912) with another 'T' to mechanical fuel pressure gauge on the panel.  All hose is 'Aeroquip' brand with fire-sleeve.  When I park it on the ramp after flying, the fuel pressure gauge rises to 10psi (engine, pumps off) due to Vapour forming in the lines due to ambient heat from engine in the cowl, it slowly bleeds away after a few hours.  I've never had vapour lock problems with it, but am very aware this is a dangerous scenario.  I would like to reconfigure the system to alleviate this danger if possible.



Open to any advice you gentlemen may have regarding this!



Best regards,



Chris

U-Z01



PS, here's a link that features the Zodiac on a recent Search and Rescue get together in Central/North Thailand.  Sorry, no English, but pix say most of it!



http://www.sportflyingthailand.com/index.php?lay=show&ac=article&Id=322952&Ntype=4

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gfmjr_20(at)HOTMAIL.COM
Guest

Posted: Sun Jul 16, 2006 2:50 pm Post subject: Introduction and Fuel Systems (trying to keep it brief!)

Chris--

   It sounds like you have the typical Czech fuel installation.  I just 

installed their FWF on a 601XL. The only difference (other than wing tanks 

versus the fuse tank)  appears to be a return line in my FWF system. The 

return line (as suggested in the rotax information) is to alleviate vapor 

lock. You might want to also put another  T in you main line feed with a 

.3mm restriction return line to the main tank. That should reduce your 

pressure increase and potential vapor lock



George May

601XL 912s



 	  Quote: 	
		  From: "zuluonecat" <easternflyingclub(at)HOTMAIL.COM>

Reply-To: zenith-list(at)matronics.com

To: zenith-list(at)matronics.com

Subject: Introduction and Fuel Systems (trying to keep it 

brief!)

Date: Sun, 16 Jul 2006 07:21:50 -0700




<easternflyingclub(at)hotmail.com>



Hi list, I've been quietly reading this great forum for a while now, time 

for me to introduce myself!  Name: Chris, Plane: Zodiac 601UL/912 where: 

Thailand, Eastern Seaboard.  As far as I and the Zenair man know, this is 

the only flying 601 in Thailand at the moment.  I purchased this aircraft a 

few years ago, from a closed airfield where it sat for 6 years unused, and 

freshened it up with a new panel, cowl, and everything else to get it 

airworthy again, it flew on August last year, and has been performing well. 

  It's an early Czech built 'quick build' kit I believe. (serial 7001)

My question regards the fuel system, I've read all the posts I can find 

about this, but would like a bit of fresh advice if possible.  Big centre 

tank (60L) with flexible hose to a centre console on-off valve, and down to 

the firewall mounted Zenair sump/drain, flexible hose up to a firewall 

mounted Facet boost pump, up to an aircraft inline fuel filter, to the 

mechanical pump, back to a 'T' for the carbs (Rotax 912) with another 'T' 

to mechanical fuel pressure gauge on the panel.  All hose is 'Aeroquip' 

brand with fire-sleeve.  When I park it on the ramp after flying, the fuel 

pressure gauge rises to 10psi (engine, pumps off) due to Vapour forming in 

the lines due to ambient heat from engine in the cowl, it slowly bleeds 

away after a few hours.  I've never had vapour lock problems with it, but 

am very aware this is a dangerous scenario.  I would like to reconfigure 

the system to alleviate this danger if possible.



Open to any advice you gentlemen may have regarding this!



Best regards,



Chris

U-Z01



PS, here's a link that features the Zodiac on a recent Search and Rescue 

get together in Central/North Thailand.  Sorry, no English, but pix say 

most of it!



http://www.sportflyingthailand.com/index.php?lay=show&ac=article&Id=322952&Ntype=4





Read this topic online here:



http://forums.matronics.com/viewtopic.php?p=47596#47596


	


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zuluonecat

Joined: 12 Jul 2006
Posts: 4
Location: Thailand

Posted: Sat Jul 22, 2006 4:46 pm Post subject: Re: Introduction and Fuel Systems (trying to keep it brief!)

Thanks very much for your reply George, I will source a restrictor (I've seen a restrictor 'T' that would be perfect) to bleed fuel and vapour back to the tank.  Simple job, as I have a guage at line pressure on the panel, and the top tank connector is redundant and blocked off at the moment.



Cheers!



Chris.

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