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fuel return system rotax 912s

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fconnell(at)bigpond.net.a
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Posted: Thu Aug 10, 2006 3:04 am Post subject: fuel return system rotax 912s

Some advice please re rotax fuel return  system.

 Is this always necessary?

 Do some installations run succesfully without0 it,say, with adequate fuel line insulation & perhaps with dedicated air0 vent.to the fuel system

 What is its main purpose-to cool the fuel by0 recirculating warm fuel back into the tank,or perhaps to allow any fuel vapour0 to be purged from the system?

 All advice welcome.

 Frank Connell   Australia.

  

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paul.mitchell2(at)homecal
Guest

Posted: Thu Aug 10, 2006 3:43 am Post subject: fuel return system rotax 912s

Frank,

 I live in the Uk and we do have some warm days. I0 would say the return line is a must. It's purpose is to return any vapour lock0 or air bubbles back to the tank. I can see mine while I am flying and there are0 bubbles going back to the tank in a steady stream. Not a lot but they are0 there.

 Paul Mitchell

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thilo.kind(at)gmx.net
Guest

Posted: Thu Aug 10, 2006 10:33 am Post subject: fuel return system rotax 912s

Hi Frank,

  

 most Rotax 912, that I know of, don't have the fuel0 return (including mine, a Zodiac CH 601 HDS). No problems with that set-up,0 except during re-starts on hot days. In such cases, the hot engine and the lack0 of air going through the cowling will create vapor lock, which will make it0 difficult to re-start. One way is to take the cowling off, so that the hot air0 can get out. Another way, we just learned from a Rotx shop is to switch on the0 electrical fuel pump, keep it running for 3 minutes, switch it off, push a0 throttle ever so slightly forward and start (without choke). Works well on the0 D40 in our flying club here. I haven't tried that yet on my Zodiac.

  

 Best regards

  

 Thilo Kind

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