Lets start with a basic rule of thumb:
1. A "new" pump either works; or it does not, period. This is especially true if it was tested prior to replacement installation. (something we always do in the manufacturing of any item/model because this will eliminate any variables)
2. You may want to inspect the quick disconnects:
(a)--- making sure that they are not clogged; or are in good condition.
(b)--- make sure all QD's are of and from the exact same manufacturer. The Chinese knock-off's for example are not compatible with the USA made brands in most cases. Therefore, will not engage water flow.
In the end, this should be a simple one to resolve by a knowledgeable repair shop, or the Operator.
Hope this helps you to solve your situation.
Ed Valentine
cross-American corp.