Noah
Well Known Member
My RV-7A has just shy of 1000 hours and the capacitive fuel level gauges (Vans plates in fuel tanks) have always been spot-on, until a couple of months ago, when I noticed they are BOTH reading HIGHER than the levels in the tanks by a few gallons. Dangerous! I have reverted to old-school timing of each tank and bookeeping. My Princeton converters have 5 setpoints feeding AFS 4500 displays. Always dead nuts. Thankfully the red cube fuel flow totalizer has always been spot-on so that's some insurance. I ran a tank dry with the gauge showing 1.5 gal remaining.
Has anybody else had a problem like this? I verified my calibration setpoints haven't changed since Phase I. What kind of failure mode should I be considering? I only use 100LL, so this isn't a mogas fuel mixing issue / capacititve differences with different types of fuel. Should I be looking at the converters? The plates in the tank? Plots of fuel level over time in flight are very linear & consistent, no jumpiness or noisy signals.
Has anybody else had a problem like this? I verified my calibration setpoints haven't changed since Phase I. What kind of failure mode should I be considering? I only use 100LL, so this isn't a mogas fuel mixing issue / capacititve differences with different types of fuel. Should I be looking at the converters? The plates in the tank? Plots of fuel level over time in flight are very linear & consistent, no jumpiness or noisy signals.