Ok I have been having a similiar problem with my last 2 kegs, all beer poured through this kegarator has been the same Busch Light. All of sudden with the second to last keg that I purchased, it would foam off the first 2 sometimes up to 4 beers before being able to pour a good beer. With the present keg, I am having 1-2 beers of foam before getting a full 20 oz beer.
I do live in the southeast, the appliance is being kept in the garage, the inside temperature is at around 36 degrees, the beer temperature is dispensing seems to be fine to my palete. Could low pressure in the Co2 tank cause a pumping problem as with air conditioning, (when freon runs low the lines freeze)? Is there anyway (aside from installing a second pressure gauge) to determine the pressure level of the tank? I have been at a loss, followed some of the instructions in this thread, although I can't find any flow holes in my stem at all, the neck of the tap did unscrew slightly so I tried that with no better luck. If it's a fact that the appliance is in the garage and therefore when it's cooler outside it works better is the reason than I will suffer along with it, if it something else then I am willing to try it out. I look forward to any and all advice...