Sudden complete motor failure
in 912 / 914 Technical Questions
8 years ago
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Re: Sudden complete motor failure
by James Ott » 8 years ago
Could it be vapor lock due to long idle times. Do you have the fuel bypass line installed?
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Re: Sudden complete motor failure
by Richard » 8 years ago
Dear James, what I know is that there is a separate fuel line for the backup electric pump (that was running during the incident).
In case of a vapor lock, is it typical for a vapor lock that it happens while the aircraft is:
-in the sun
-standing still and running for 10 minutes on idle
-and then giving throttle?
Would be a relief if that would be the cause!
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Re: Sudden complete motor failure
by Roger Lee » 8 years ago
Typically this happens after a flight and you land for a while. Then the fuel lines under the cowl heat soak.
Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell
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Re: Sudden complete motor failure
by James Ott » 8 years ago
The fuel bypass line is what keeps cool fuel circulating during hot long idle times. It is required by Rotax in their engine installation manual and you need to make sure you have it. It is different from the extra line for the backup pump. Your recent motor stoppage may or may not have been caused by vapor lock, but it sounds to me very possible. In any case, this bypass line should be installed in my opinion, especially if you run Mogas.
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Re: Sudden complete motor failure
by Richard » 8 years ago
We did another test and we experienced when giving full throttle that after about 10 seconds the rpm went down from 6.000 to about 4.000. After two seconds or so rpm was back to normal. Ten minutes later the same thing happend again. We checked the fuel lines again and found an air bubble in the fuel filter. We removed the air bubble and tested again. We tried the engine for half an hour and it didn't occur again.
Could the failure also be caused by air in the fuel lines?
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