fuel pressure
in General Tech Discussion
7 years ago
Tommy Megremis created the topic: loss of fuel pressure
I recently purchased new Sirius TL3000 high wing which flies beautifully. It has a 912ULS engine with aux pump in parallel and the fuel block is return vented to the gascolator. The airplane has about 50 total hours. On two occasions on cross country trips when flying from high altitude e.g. 7000 to 9000 agl down to lower altitude fairly rapidly(500-1000 fpm) I received low fuel pressure warning from the Dynon Skyview HDX and a separate analog backup gauge which works off a separate sending unit. The aux pump rectified the fuel pressure to normal immediately and the engine never missed a beat even when the low fuel pressure warning was on. Eventually I am able to switch off aux pump and all is well. Otherwise when flight altitudes are fairly constant the mechanical pressure stays at 4.2 psi. This airplane has no carb heat as Rotax says not needed due to carbs on top of motor. Again the engine ran smoothly and spun up normally even with low fuel pressure. Is this some quirk related to the fuel tanks venting problem or the Bing carbs or bubble formation in the mechanical pump? Any ideas?
I recently purchased new Sirius TL3000 high wing which flies beautifully. It has a 912ULS engine with aux pump in parallel and the fuel block is return vented to the gascolator. The airplane has about 50 total hours. On two occasions on cross country trips when flying from high altitude e.g. 7000 to 9000 agl down to lower altitude fairly rapidly(500-1000 fpm) I received low fuel pressure warning from the Dynon Skyview HDX and a separate analog backup gauge which works off a separate sending unit. The aux pump rectified the fuel pressure to normal immediately and the engine never missed a beat even when the low fuel pressure warning was on. Eventually I am able to switch off aux pump and all is well. Otherwise when flight altitudes are fairly constant the mechanical pressure stays at 4.2 psi. This airplane has no carb heat as Rotax says not needed due to carbs on top of motor. Again the engine ran smoothly and spun up normally even with low fuel pressure. Is this some quirk related to the fuel tanks venting problem or the Bing carbs or bubble formation in the mechanical pump? Any ideas?
