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Sounds like your fuel gauge sending unit is bad. The sending unit will have to be replaced as a whole. It is located in the fuel tank and may or may not be part of the fuel pump itself. New vehicles have the sending unit and the pump as one whole unit. Sometimes you can access the top of the fuel tank by removing the rear seat and removing the large grommet or cover. Good luck.

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Q: Why is it when you put in 10 gallons of gas the gauge only shows your tank is half or maybe one quarter full on a Nissan 240sx 1989 coupe?
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