Larry DeCamp
Well Known Member
I have asked before and got no response. My fuel pressure reading (carb) is OK on the ground but drops significantly flying. Example, at startup/run-up, mechanical may be near green and in the green on boost pump. But flying, both pressures drop proportionately to about half way between o and green. High Altitude (8k) and temperature affect it a little, but the same trends remain.
If the sender referenced local pressure, why wouldn’t the fuel pressure go up, proportional to altitude . If the sensor is a strain gauge, wouldn't’ it be indifferent to altitude and a little sensitive to temperature ?
I know the absolute reading could be a calibration issue with Vans steam gauge, but drop at altitude is puzzling. Ideas appreciated.
If the sender referenced local pressure, why wouldn’t the fuel pressure go up, proportional to altitude . If the sensor is a strain gauge, wouldn't’ it be indifferent to altitude and a little sensitive to temperature ?
I know the absolute reading could be a calibration issue with Vans steam gauge, but drop at altitude is puzzling. Ideas appreciated.