You have the pump air bound, try opening the lowest or closest faucet first, I usually try the commode first hold the flush pedal down and go from there sometimes it takes a while. Mine started doing that and it finally quit found the housing inside my pump broken of course mine was older than yours . On mine I have found if I move the valves around on my water panel it starts to prime. And do not open more than one faucet at a time
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