This phenomenon exists in the air leakage of coke machine syrup pump. Coke machine can only be repaired by professional equipment personnel, so you have to contact professional maintenance personnel. Please do not disassemble it without permission, otherwise there is no warranty. PepsiCo coke machine is a professional equipment for making carbonated drinks. PepsiCo coke machine includes syrup pumps and connectors, pressure gauges, syrup pipes and accessories, water filters, carbon dioxide cylinders, ice makers and other accessories.