Hello,
It sounds like the issue is the fuel level sending unit.
The fuel level sender is mounted on the fuel pump assembly. It consists of a float and a resistor panel. With the fuel level the float will go up or down and contact different part of the resistor. That gets translated into the fuel level at the gauge.
Malfunctioning level sender can show that the fuel is full when it is not or vice versa.
In order to replace that sensor you will have to remove the fuel tank and take out the fuel pump.
https://www.2carpros.com/articles/how-to-replace-an-electric-fuel-pump
I have attached diagrams for your reference.
Please let me know if you have any questions.
Thank you.
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Tuesday, December 14th, 2021 AT 8:45 PM