Gas gauge

Asked by Mar 13, 2013 at 05:02 PM about the 1987 Nissan 300ZX 2 Dr GS 2+2

Question type: General

When the fuel tank is full the gauge is measuring it right but once it goes below 1/2 tank the needle
drops all the way to empty.  The only way I know it still has fuel in it is by the mileage.  I have people
tell me that I need to fill up when I have just driven it 100 miles.

4 Answers


Sounds like a bad sender, the sender is just like a rheostat with segments that tell the gauge how many ohms for different fuel levels, sometimes those segments get dirty or simply wear through and then the gauge looses the signal. Hope this helps.

2 of 2 people found this helpful.

Running around with less than half a tank for twenty years has worn a hole in the resister windings. Reset the trip odometer when you fill it up so you know how many miles you have gone.

1 of 1 people found this helpful.

I concur. It is your sending unit.

1 of 1 people found this helpful.

My car is doing the exact same thing, but my mechanic is telling me that I have 2 sending units and they both have to be changed.. Is this true? Thanks

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