Quote:
Originally Posted by VCuomo
That's what just happened this morning - when I started the Z this morning the gauge was suddenly down 3 LEDs.
Last night the gauge was still reading full, but the "Range" display seemed to be showing the correct range - about 300 miles. Using an average MPG of about 20MPG that was displayed, that indicates that the tank has about 15 gallons left - definitely not full. So it would seem that the sender is working like it should, but the display is not (either the display itself is bad or something strange is going on with the ECU). And now it's working again like it should - very strange...
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The sender may still be the part with the problem. The computer tries to smooth out the fluctuations of the sender so that you don't see flashing lights or moving dials, so erratic sender voltages while driving are hidden. When you restart the car it takes a fresh reading and starts again which is why it is not unusual to see the gauge move a fair bit after a restart.
On my G35 the float arm that the sender uses got bent resulting in the car reporting 3/4 of a tank as I spluttered into the gas station out of fuel.