why is the fuel warning light still on after refuel?

The fuel light in my car is on when there is a bit fuel left in the tank. After supper, I went to the gas station and refueled. Now it is almost full, yet the warning light doesn't go off.

The reason is probably due to your improper operation of tank cap,losen
or not firm.

After couple of days driving, it should go off if there is no car problem.
 
很能是fuel sending unit出啦问题.:blowzy:
 
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