Today's Message Index:
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1. 01:18 PM - Fuel return line (John Elling)
2. 01:36 PM - Re: Re: fuel return line? (rayj)
3. 04:23 PM - Re: fuel return line? (Roger Lee)
Message 1
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| Subject: | Fuel return line |
Folks, I've followed the fuel return line thread and I can see that the
912 ULS installation manual calls for a fuel manifold with a return line
to the tank. My 912 ULS on my Titan Tornado does not have one. There
is simply a T in the fuel line out from the mechanical pump to each
carb. I've recently added an electric backup/boost pump to the fuel
system which I use on startup and on takeoff and landing (when I
remember to turn it on). The electrical boost makes it much easier to
start the engine.
The engine and airframe had about 650 hours with the original
mechanical-pump-only configuration and now there are another 30 hours
with the mechanical+electrical fuel system and I have not had any
problems running the engine.
What is going on in the fuel system in the absence of the manifold and
with the electric pump on and off? Is excess fuel going overboard from
the carb bowl drains? Is there some flow regulation that is
compensating for (what I assume is) the variable fuel pressure?
Is it worth rebuilding the fuel system to add the manifold?
On a side note, none of the other Rotax 912-equipped Titan Tornadoes I
have seen have had a fuel manifold either. So leaving it out of
home-build installations seems common.
Thanks for any advice, John
Message 2
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| Subject: | Re: fuel return line? |
Greetings Roger,
Thanks for the items you posted below. I looked at them and then went
back later to save them and the one for the ULS gives me a 404 error.
Please post them again so I can down load a copy.
Thanks again for your help.
Raymond Julian
Kettle River, MN.
"And you know that I could have me a million more friends,
and all I'd have to lose is my point of view." - John Prine
On 03/31/2013 05:11 PM, Roger Lee wrote:
>
> Hi Raymond,
>
> The 912UL and ULS needs a return line. It is in the Installation manual. The
orifice size is .035. The line comes off up by the carb feed where it bifurcates
to the carbs on the cross over balance tube and can go back to either a wing,
a header tank or the gascolator. It is absolutely necessary if you have the
new style fuel pump or you may easily flood the carbs and puke fuel out the vent
tube. This helps for carb flooding and vapor lock.
>
> I looked through the 912Si Installation manual and found no return line. Here
are the pages from each Installation manual.
>
> --------
> Roger Lee
> Tucson, Az.
> Light Sport Repairman - Maintenance Rated
> Rotax Repair Center - Heavy Maint. Rated
> Home 520-574-1080 TRY HOME FIRST
> Cell 520-349-7056
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=397460#397460
>
>
> Attachments:
>
> http://forums.matronics.com//files/912_fuel_injection_installation_manual_150.pdf
> http://forums.matronics.com//files/912uls_rotax_installation_manual_326.pdf
>
>
Message 3
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| Subject: | Re: fuel return line? |
They are in the installation manual.
--------
Roger Lee
Tucson, Az.
Light Sport Repairman - Maintenance Rated
Rotax Repair Center - Heavy Maint. Rated
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=397812#397812
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