Intermittent Low Fuel Pressure

by Sid Lloyd in 912 / 914 Technical Questions 6 years ago

2012 CTLS, just did 5-year rubber replacement. In warm weather and after long taxi at low power, when full power is added (takeoff WOT), fuel pressure will drop generating a warning light. In addition, at the same time, fuel flow briefly climbs to 10-11 gph, then fuel pressure rises to normal and fuel flow drops to normal full power climb rates. Have changed fuel pump (twice). Thoughts? Thanks!

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Re: Intermittent Low Fuel Pressure

by Garrett Wysocki » 6 years ago

Garrett Wysocki

1 572 1.45k

I have a 2009 Remos GX and have similar issues. My fuel pressure drops after leveling off or during a decent and leveling back out. The problem has not been as bad with the new style pump, but no one seems to be able to explain this.

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Re: Intermittent Low Fuel Pressure

by James Ott » 6 years ago

James Ott

22 322 358

I have had the same issue for 600 hours. The engine has never hiccuped once when the fuel pressure was in the warning area at WOT, so I quit worrying about it. Sure wish someone could explain it though. I know there are several others who have this same issue in varying degrees. Supposedly the Rotax factory was looking into this several years ago, but nothing has ever been said about it.

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Re: Intermittent Low Fuel Pressure

by Barrie Strachan » 6 years ago

Barrie Strachan

0 7 0

I had intermittent low fuel pressure warnings ( < 2 PSI) for years. StingSport low wing, fuel tank under the cockpit floor. Never had the engine stumble, and turning on the boost pump usually brought the pressure back up. I finally found that the flow restrictor in the return line that goes from the "octopus" on top of the engine back to the main tank was totally plugged. I cleaned it out and haven't had a single problem since.

Thank you said by: Garrett Wysocki

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Re: Intermittent Low Fuel Pressure

by Sid Lloyd » 6 years ago

Sid Lloyd

2 2 0

Thanks! I’ll check it out tomorrow.

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Re: Intermittent Low Fuel Pressure

by Garrett Wysocki » 6 years ago

Garrett Wysocki

1 572 1.45k

Yes, thank you I am going to check it out also.

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Intermittent Low Fuel Pressure

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