gas gauge stopped working after fuel pump and fuel filter was repaired on BMW 740i

Average mileage: 163,000 (163,000–163,000)
1 model year affected: 1995
2 people reported this problem
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1995 BMW 740i, One day while driving my car died. It would restart but was not getting gas. Battery cable was taken off during the process of elemination trying to figure out what was wrong with the car. I took my car to the local BMW shop the diagnosis was the fuel pump and fuel filter needed to be repaired. After the repair work the following day i filled my gas tank but my gas guage never moved. my gas light remains on..what could have caused this. My gas guage was working prior to the repair service.