I have a capacitance fuel gauge sender in a tube behind the baggage
compartment, and a VDO gauge on the panel. For some reason the gauge
refuses to read more than about 5/8ths full even when the tank is
brimming. I had this fault intermittently last summer, but after about
an hour's flying the fault corrected itself and the reading returned to
normal. Once the tank really is below 5/8ths full the gauge starts
functioning normally right down to empty. The vent appears to be clear
and blowing down it makes no difference. It was recently completely
emptied when I was replacing a fuel pipe, so there is no foreign
substance in the tube. The wiring appears to be sound. It's as though
the top part of the probe is inneffective, but as I don't understand
these things I would welcome advice. should I pull the capacitance tube
apart to look at it?
Frank Mycroft
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