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Rotax 914 fuel starvation stopage on ground

  • GADGET
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7 months 1 day ago #17575 by GADGET
Hi

Yesterday I was performing a maintenance start on my Rotax 914, installed on a new Blackshape Prime, grounded for almost a month now, due to bureaucracy of civil aviation authorities in order to be able to operate with no restrictions the airport I want to base the aircraft.

Battery showed 11.9 Volts, so I decided it could be a good idea to start the engine and charge the battery while keeping those pieces moving and lubricating. At the begining I could not start the engine, probably due to the low battery voltage. I called a mechanic and tried again after battery cooled for about 30 minutes, with no other action required. This time the engine started, but after a minute or so, the engine run rough and stopped (fuel starvation). When tried again to start the engine, I noticed that fuel pressure was cero, with either one of the fuel pumps, or both.

See the video and please let me know what you think.

Thank you


drive.google.com/file/d/1FKB03WiLTWZnlaq...z8r/view?usp=sharing

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7 months 1 day ago #17577 by Roger Lee
Replied by Roger Lee on topic Rotax 914 fuel starvation stopage on ground
I would start with checking any fuel filters. Possibly blowing out the fuel hoses, checking banjo bolt fittings common to both carbs. Those pumps seemed sounded high pitched and noisy like they didn't have fuel. The sound usually has a duller or more muffled sound with fuel in them and pressured up.
You have to start somewhere with the diagnostics. Since neither pump seems to give any pressure you might want to start on the fuel delivery from the tank to the pumps and any filter in line.

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-574-1080 Home (TRY HOME FIRST)
520-349-7056 Cell
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7 months 1 day ago #17578 by GADGET
Replied by GADGET on topic Rotax 914 fuel starvation stopage on ground
That is my plan also.
Thank you so much.
I am in need for some support.

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6 months 3 weeks ago #17652 by Berkut13
Replied by Berkut13 on topic Rotax 914 fuel starvation stopage on ground
Check the fuel vent lines too. Some bugs love to make nests in the outlet hole and if it is plugged, the pump can not pull fuel against a vacuum.
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6 months 3 weeks ago #17654 by GADGET
Replied by GADGET on topic Rotax 914 fuel starvation stopage on ground
I sure will
Thank you

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3 months 6 days ago #18498 by GADGET
Replied by GADGET on topic Rotax 914 fuel starvation stopage on ground
Problem solved.

Thing was that the fuel selector and the fuel valve were connected by a rod too short, that got disconnected from the corresponding receptacles on the fuel valve and the fuel selector handle.

A new longer rod was in order and everything is ok.
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