MY FUEL GAUGE FLUCTUATES ALL THE TIME SINCE MY FUEL PUMP WAS REPLACED. on 2001 Toyota Corolla

A MECHANIC CHANGED MY FUEL PUMP AND EVER SINCE THAT FAITFUL DAY 3 MONTHS AGO MY FUEL GAUGE FLUCTUATES. WHO CAN REPAIR IT OR CAN YOU ADVISE IF I CAN DO THIS MYSELF?
JHB - MIDRAND

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2 answers
Bring it back to the shop that replaced the pump.
agree with #1 what kinda assm did he use,poss bad. also could be the float is not free from obstructions in tank