Hello and thanks for your time. I have no idea how to prime my irrigation pump. Not sure where to add water or what the big additional tank is on top of the pump. I turned the pump on and it ran for a few minutes and never built pressure, so I assumed it was not sucking water. Any help you may be able to provide will be greatly appreciated. The manual doesn't make sense to me; I'd rather chat with someone who has done this before. I've included some photos for reference. Thanks!