Hi my 1998 Nissan micra k11 fuel gauge keeps fluctuating changes the sensor in the tank still the same
In a conventional system the tank sensor provides a variable ground path for the gauge which is fed by a stable regulated voltage from the instrument regulator. Sometimes the regulator will fail and cause a fluctuating voltage supply depending on engine speed, whether the lights are on or off and suchlike. Mostly such fluctuations, if they seem random, are caused by a less-than-perfect connection somewhere, mostly the fuel tank ground connection. Newer systems use a computer to drive the instruments but excellent connections are equally important..
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