Super sales job! If the glycol system components are intact and the keg cooler has a constant temperature, the system could be set up with 100% CO2. Pumps were never designed for short systems. Nor were FOBs.
Pumps are applied to very long systems (150' plus) with extensive lifts where gas blenders are ineffective. FOBs are also designed for long systems as they eliminate a substantial amount of waste when a keg empties. FOBs are helpful in short systems such that the glass is not knocked out of the bartenders hand when the keg empties.
Determine beer temperature in the keg, set the pressures to this temp. based on its carbonation level. Possibly rebuild the lines for proper restriction to this pressure at the keg and
remove the pumps.
Scott Zuhse, Instructor
Micro Matic Dispense Institute