I've recently been priming my beer in the keg because I can only fit 2 kegs and a co2 tank in the fridge and I want them ready to drink as soon as they get cold rather than waiting 3 or 4 weeks. I've been putting them on the co2 like normal at 15 psi because I assumed they need the pressure for serving. But is that true? Can I just hook up a serving line and let it flow? Followup question: if my primed keg is primed over 15psi is it forcing co2 back into my co2 tank? It makes absolutely no noise or other indication that co2 is going into the keg when I have already primed.