Fuel Pressure Drop at Runup

[olderthandirt]

I would guess like most the real concern is loss of power, especially on takeoff...none of the posts ever say they had loss of power which I am very glad to hear...with two fuel pumps it would surprise me if both gave up the ghost at same time?? thanks for all the posts and help...

[bruceflys]

Four RV-12s, all E-LSA, and a Piper Sport fly out of my home airpark. The Sport and one RV-12 had frequent fuel pressure alarms on departure. They occurred after rotation and continued for 30 to 60 seconds. For reasons unknown, the low pressure instances gradually became infrequent.

During Phase I testing of my wife's RV-12 I experienced its one and so far fuel pressure alarm after a power off glide from 5000 to 1000'. During power up and climb the pressure dropped similarly to others' departure experiences.

Importantly, in all of these instances no engine roughness or power loss occurred! Yes, the alarms are disconcerting, but seemingly inconsequential.

I have almost 400 hrs on my E-AB SeaRey with a 912ULS. I did not see any reason to install fuel pressure or flow sensors on a carbureted engine with a return line. Never had roughness or power loss. Sometimes ignorance is bliss.

[RFSchaller]

I agree with Bruce. Fuel flow, fuel pressure and EGT/CHT indications are very helpful in diagnosing problems, but spurious alarms at critical phases of a flight can be dangerously distracting.

[ben barron]

This seems to be an issue like the Voltage Regulator where many of us have had similar issues. Has Rotax ever formally responded to this? Like the suggestion to formally contact Rotax on the VR maybe those of us that have experienced this should submit our issue and force a response.

http://www.rotax-owner.com/en/suppor...rmation-report