Welcome to the forum. Couldn't quite follow the suction path in detail, but are you saying that you basically have a single hose feeding the pump and it primes, starts pumping, then quits? Usually once a pump gets going it won't quit pumping. Impellers generally don't wear out. When you say 'once the hose has water in it the vacuum peters out' do you mean the pump basket gets air in it? If so, here's what I'm thinking. If you hooked the hose to one side of a Tee for example, put the end of the hose in the pool, started the pump, it would prime but once you started pulling water maybe the 'other' side of the Tee, the one without the hose, has now exposed an air leak once water was sucked out and that's what's causing the flow to quit.
Glad the pump fix was an easy and cheap one.
Al
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