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Fuel Return line 912 ULS

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madriver(at)wildblue.net
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Posted: Tue Aug 05, 2008 3:47 pm Post subject: Fuel Return line 912 ULS

I know that the subject has been broached before but still in a quandry about the " fuel return line " fitting on the fuel manifold of my 912 ULS.  The Rotax drawing says something like " zum fuel tank " which in english translates to to fuel tank.  

   

 In previous discussion I've been advised that the return line is not necessary and another response that " the fuel line was plumbed into the line from the tank" - I sure don't want to try to attach a fitting to the tank at this point as the tanks are in the wings.

   

 I an going to install a gascolator on the engine side of the fire wall which has a 1/4 npt hole used for a primer attachment that I could use to run the return line back to the system.

  

 Anybody have any thoughts and or suggestions on this routing?  Jon what are your thoughts on this arraignment?  Who could I contact about this at Rotax?

  

 Phil



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ptag.dev(at)tiscali.co.uk
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Posted: Tue Aug 05, 2008 11:02 pm Post subject: Fuel Return line 912 ULS

Hi! Phil  

The LAA will require that all fuel lines to the engine are solely dedicated to the engine, IOW there must be no other service fuel lines joining. WE with Europa Aircraft have water drain pipes also connected to our tanks, in my case by a special combined adapter into the tank(produced by Graham Singleton (who I have copied in to this mailing) We utilize two connections on the Europa Tank since it is a saddle tank (one side being reserve)so fuel return is connected to the water drain side on the reserve side and our visual sight gauge being connected to the other side water drain pipe. The necessity for a return side depends on the time “yet to be used fuel” sits in the engine compartment gaining heat before getting to the carbs. and of course ambient temperatures.  

Also I note that you are fitting a GASCOLATOR to the engine side of the firewall …..this is also a fuel delivery pause place where the fuel gets to heat up prior to getting to the carbs. My installation has fire stop insulation lagging through which all the fuel pipes are routed in the engine compartment this also reduces the fuel temperature increase.  

Regards  

Bob Harrison G-PTAG Europa c/w Rotax 914 and Intercooler.  

   

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ptag.dev(at)tiscali.co.uk
Guest

Posted: Wed Aug 06, 2008 1:19 am Post subject: Fuel Return line 912 ULS

Hi! Philip/all

Graham Singleton has highlighted another item to consider concerning

fuel heat up ....of course not applicable on my 914 installation since

the pumps are both electrical but his point is valid for mechanical

pumps.

Regards

Bob Harrison.



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