are you keeping the soda in the fridge in the fridge or running it through a cold plate? pepsi standards for co2 volume is 3.4 when we set up a system running through a cold plate on diet pepsi our pressure is at 40 lbs but soda is at room temp run through a cold plate with 1/4 inch line we are also not useing a beer head to dispense soda im a tech for pepsi if you need to get in touch with me let me know
marty
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