Fuel tank is comparably low and wide and irregular shape and the cars is not always level, there is no way you will get very accurate reading and it has to be on the cautions side to avoid running out of fuel. For a floating sensor to register anything there need to be certain level of fuel to lift it. If you have dry tank you can probably put couple of litres of fuel in it and the sensor float will still be resting on the bottom of tank and showing no fuel. I think you would do better with load cells checking weight of tank than 2 floating sensors.
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Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
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