1/4" would work if you use around 18' of it. Just not practical. Start with 7' to 8' of clear 3/16". The bud select is around 2.5 vols. of CO2 which requires 13 PSIG @ 36F @ sea level to 2000' Get the pressure correct and then cut back the 3/16" in six inch increments until you acquire the flow desired. By the way, is the 36F temp from the second glass of beer or from a glass of water in the kegerator?
Scott Zuhse, Instructor
Micro Matic Dispense Institute