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Finally got around to looking at #PEH578L's petrol gauge. Multimeter showed that the fault was at the sender, which is a simple float on an arm operating a variable resistor.
Opened it up and was slightly surprised to discover a wire-wound rheostat. Also that three of the turns are broken which would explain why it doesn't work. So unless I feel like re-winding it, I probably need a new one.
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Ben Harris
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in reply to Alexandra Lanes • • •@ajlanes The tank is basically a cuboid, so I don't think that's what it's for.
It might be compensating for the fact that the float is on a pivoting arm, so the rate of rotation changes with depth.
But now that I look at it, I think the variance may be the wrong way around for that, so maybe it's compensating for non-linearity in the dashboard gauge instead.
Maybe I should do some experiments...
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