Mandatory fuel return line

by Rich Provenzano in 912 / 914 Technical Questions 7 years ago

I just read a mandatory bulletin on the need to install a fuel return line on all 912 engines. This must be new because my plane has just had a fresh annual and this topic did not come up. Annual was 2 days ago.
I did not see a time frame for completion.
Thoughts please,
Rich

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Re: Mandatory fuel return line

by Jacques Foucher » 7 years ago

Jacques Foucher

19 107 246

I have an Evektor for ten years, and the fuel installation is exactly as in the bulletin ...
Maybe the manufacturer of your device could inform you?

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Re: Mandatory fuel return line

by Rhett Mitchell » 7 years ago

Rhett Mitchell

8 99 0

I believe it is the AIRCRAFT Mfg that will ultimately determine if it is required to be fitted.
My aircraft Mfg says it will remain an option.
My personal thoughts are that as my aircraft is a "high wing" it is not needed.

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Re: Mandatory fuel return line

by Roger Lee » 7 years ago

Roger Lee

126 5.14k 4.62k

Rotax has wanted the recirculating line for many years it just changed the language in the manual. I know some that come to the shop with them since the late 1990's. Many engines in the earlier days were open air exposed and ran cooler, but now many are inside tight cowls which maintains more heat. The newer Corona pump is better off with it to.

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell

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Re: Mandatory fuel return line

by Rich Provenzano » 7 years ago

Rich Provenzano

20 59 30

Thanks for the replies. I contacted my mechanic and the return line is there. It's routed back to the inlet side of the gascolator from the spider manifold where the orifice is located.
Rich

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Re: Mandatory fuel return line

by Bill Hertzel » 7 years ago

Bill Hertzel

13 1.95k 7.97k

... the return line is ... routed back to the inlet side of the Gascolator ...

That may be problematic.
It needs to go to a location that is vented. Preferably the Fuel Tank.
Returning Air/Vapors to the Gascolator allows it to accumulate and return back to the engine.
It will eventually find its way to the carburetors and vented from the bowls
but that defeats the purpose of a Vent Line returning the vapors to the fuel tanks to be vented.

Bill Hertzel
Rotax 912is
North Ridgeville, OH, USA
Clicking the "Thank You" is Always Appreciated by Everyone.

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Mandatory fuel return line

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