SABAOD...
I downloaded your model and found the problem in just a few seconds (at least the most obvious problem, if more than one exists). I am deliberately being cryptic because you should be able to find the same problem I found in short order, in spite of the fact that this is your first time using EPANET. HINT: check your data.
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"Is it the only lesson of history that mankind is unteachable?"
--Winston S. Churchill