Replaced the mechanical fuel pump due to increasing fuel pressure drop-outs. Before the change the Red Cube fuel flow meter was dead on. After the change it is consistently reading high at all mixtures.
Normal takeoff WOT flow was in the 14 GPH range. It now reads 25 GPH.
Normal leaned for cruise at 75% power was 8 GPH. It now reads 15 GPH.
It is NOT a fuel leak. Several test flights including a long XC indicate that the engine's burn rate has not changed. It's not a software issue - I read the raw pulse count and did the math myself and the reading is much higher than it used to be.
FWIW: The engine is fuel injected. The cube is located at the bottom of the firewall in the correct orientation. It has worked properly for the past 90+ hours.
Any guesses? Bubbles? Cavitation? Gremlins?
Thanks,
-S
Normal takeoff WOT flow was in the 14 GPH range. It now reads 25 GPH.
Normal leaned for cruise at 75% power was 8 GPH. It now reads 15 GPH.
It is NOT a fuel leak. Several test flights including a long XC indicate that the engine's burn rate has not changed. It's not a software issue - I read the raw pulse count and did the math myself and the reading is much higher than it used to be.
FWIW: The engine is fuel injected. The cube is located at the bottom of the firewall in the correct orientation. It has worked properly for the past 90+ hours.
Any guesses? Bubbles? Cavitation? Gremlins?
Thanks,
-S