Since the ethylene plant of a refinery was put into operation in June 2018 after overhaul, the pressure difference in the gasoline/diesel section of gasoline fractionator has gradually increased from 5.4 kPa at the initial startup to a maximum of 7.5 kPa, while the pressure difference in the pumparound section and the quench oil section remained relatively stable. In response to the increased pressure difference in the gasoline/diesel section of gasoline fractionator, relevant measures were developed to control the rising trend and stabilize the pressure difference within 6 kPa. The internal components of the tower were modified during the overhaul in 2023, successfully reducing the pressure difference to around 2.5 kPa.