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txpilot
Joined: 26 Feb 2007
Posts: 87
Location: Houston, TX
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 Posted: Thu Oct 22, 2009 6:28 pm Post subject: Fuel return line on Rotax 912ULS - revisited |
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I just found out that Rotax has now approved autogas with 10% ethanol for the 912 series engines. Since it seems 100LL will eventually be going away, I have to revisit the question about the fuel return line from the fuel manifold.
I was originally planning on running 100LL on my aircraft so I wasn't concerned about vapor lock issues. Therefore, I never installed the return line suggested by Rotax. However, since it seems the powers-that-be will eventually force us to alternative fuels, I'm wondering if installing this return line for running premium autogas would be a good idea. I just priced the parts needed from Lockwood to install the fuel manifold and it comes to a whopping $514.01.
Am I the only one concerned about this? Is anyone currently running autogas without the return line?
Thanks,
Dan Ginty
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Tommy Walker
Joined: 12 Jan 2006
Posts: 442
Location: Anniston, AL 36207
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| Posted: Thu Oct 22, 2009 6:37 pm Post subject: Re: Fuel return line on Rotax 912ULS - revisited |
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They are doing away with 100LL?
Dan,
I think that you could plumb the return line back to the gascolator.
You might want to call Zenith and talk to Roger or Caleb.
Tommy Walker in Alabama
Do Not Archive
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_________________
Tommy Walker
N25A - Anniston, AL |
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craig(at)craigandjean.com
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| Posted: Fri Oct 23, 2009 6:57 am Post subject: Fuel return line on Rotax 912ULS - revisited |
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You can build the equivalent of the official Rotax fuel manifold with parts
from Aircraft Spruce and McMaster-Carr. Look at their multi-port manifolds.
One tricky part is the restrictor on the return line. I think the Rotax
manuals call this out as a 0.030 inch pinhole. I intend to make mine by
filling a brass NPT nipple with solder and drilling a pinhole in it. The
manifold will be mounted vertically and the return line will come off of the
top of the manifold (like the Rotax one) since (as I understand it) in a
vapor lock situation what is being returned is vapor, not liquid fuel.
Another subtle point is that the lines to and from the mechanical fuels pump
have different IDs (1/4 inch in and 5/16ths out?).
On the 701 I won't be trying to return the fuel all the way to the wing
tanks. I'm running the return line to a multi-port manifold (also from
Spruce or McMaster) on the firewall where it will mix with cool fuel coming
from the tanks. I believe this is the way Quality Sport Planes plumbs their
701s.
-- Craig
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dwilde(at)clearwire.net
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| Posted: Fri Oct 23, 2009 7:58 am Post subject: Fuel return line on Rotax 912ULS - revisited |
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t
| Quote: | Am I the only one concerned about this? Is anyone currently running autogas without the return line?
Thanks,
Dan Ginty
I have been running premium autogas on my 912S (100HP) for over 90 hours
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with no problems and I do not have a return line. I connected the fuel
lines per Zenith firewall forward instructions. All of my fuel lines
are enclosed in firesleeve which should help shield it from high temps.
Dan Wilde
701
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s.clive.richards(at)homec
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| Posted: Fri Oct 23, 2009 11:05 am Post subject: Fuel return line on Rotax 912ULS - revisited |
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Dan
Here in UK it is mandatory to install the return line to a fuel tank to use
auto gas as per Rotax instructions, but our CAA say we cannot use auto gas
if it contains alcohol unless we are a microlight.
Clive
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txpilot
Joined: 26 Feb 2007
Posts: 87
Location: Houston, TX
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| Posted: Wed Oct 28, 2009 7:22 am Post subject: Re: Fuel return line on Rotax 912ULS - revisited |
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Thanks to all who replied. I guess I'll just get my airplane flying as is and worry about the fuel manifold later. Craig -- thanks for the idea of building a manifold. I'll consider that in the future.
Dan
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