NORDO Industries LLC
Member
in the past ~3 months of owning my new-to-me RV-12, I've averaged probably 3.5-4 GPH out here. However, it recently jumped to ~5.0-5.5 GPH.
I did an A&P shop-inspected annual a few weeks ago for the 100hr inspection on the Rotax, and afterwards, the fuel consumption during flight jumped up, and was consistently high over the course of the next 8 hours. I replaced the spark plugs, flew 2 flights over the course of 3½ hours immediately afterwards, and there was no issue found.
This weekend, I had a 2½ hour flight with no issue, but the return journey today had it back up at the 5.5 mph rate, which didn't change much as I altered altitude (though one time when was increasing altitude, the reported fuel burn went down for a few minutes while I had the throttle opened up.
I saw that there was a notice some time back about the possibility of erroneously high fuel flow rates at certain altitudes, however the measured fuel burn has always matched the real world one, both via the mechanical gauge and how many gallons I'm pumping into it.
Any idea I could be missing here? Could it even be something along the lines of how it's being filled, given the vent lines? The carbs weren't opened as it was the engine's first 100-hour service.
I did an A&P shop-inspected annual a few weeks ago for the 100hr inspection on the Rotax, and afterwards, the fuel consumption during flight jumped up, and was consistently high over the course of the next 8 hours. I replaced the spark plugs, flew 2 flights over the course of 3½ hours immediately afterwards, and there was no issue found.
This weekend, I had a 2½ hour flight with no issue, but the return journey today had it back up at the 5.5 mph rate, which didn't change much as I altered altitude (though one time when was increasing altitude, the reported fuel burn went down for a few minutes while I had the throttle opened up.
I saw that there was a notice some time back about the possibility of erroneously high fuel flow rates at certain altitudes, however the measured fuel burn has always matched the real world one, both via the mechanical gauge and how many gallons I'm pumping into it.
Any idea I could be missing here? Could it even be something along the lines of how it's being filled, given the vent lines? The carbs weren't opened as it was the engine's first 100-hour service.