Brian, I'll go ahead and say it, welcome to the forum. You will not find another place to go that will help you more with your A4 questions than here. You had mentioned having some 3/4" hoses on your water intake. If there is the slightest air leak in that part of the system, it will not pump water. All of the info so far is good so, take it one step at a time and we'll get you through it.
tom
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