2001 Pontiac Sunfire Q&A

2001 Pontiac Sunfire Question: WHY MY FUEL GAGE IS ONLY READING HALF FULL. BUT THE CAR IS FULL OF FUEL?

JUST HAD THE FUEL PUMP REPLACED AND THE FUEL GAGE IS ONLY READING HALF FULL WHEN IN FACT THE CAR IS FULL OF GAS. NOT UNDERSTANDING WHY THIS IS HAPPENING. PLEASE CAN SOMEONE HELP ME??? -
Answer 1
Was it working ok before the pump was installed? And does it work from 1/2 to empty? -