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There is faucet on the system (though I don't really use it) - so that explains the presence of the tank in the old system. There is a check valve on the inlet pipe, I did prime the pump before starting it initially, and the pump seems to hold a prime, so I think we're good there. I suspect...

Thanks for the reply! I went with the pump + tank setup, because the original system that died had both a pump and a tank. I thought the tank was required to maintain pressure. I'm surprised, since the reviews of that pump have several people very happily using it for their sprinkler systems...

I've recently replaced my sprinkler system pump with a 1 HP shallow well pump from Harbor Freight. The pump turns on, runs and seems so far to maintain a prime. The problem is, it does not build any pressure; the pressure gauge stays at zero and only one sprinkler head runs. I also have an...