Im dealing with what I think is a air bladder issue on a Hoyt tank, however I cant for the life of me find any info online about this tank, nothing on it says anything about an air bladder, wondering if this is a bladder less tank? It has a valve stem near the top. When I pressed that down water dribbled out. The pump was short cycling, added air to the tank to 2 lbs below the 30lb cut on, now the pump cycles every 20 seconds or so depending on water demand. Any help/input would be greatly appreciated.