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try checking the connections first, along with checking the grounds then check the relays also, since if it's a bad pump, you'll have to know the problem to buy a rebuild kit or new pump...
funny mine have gone the other way, it doesn't turn off even after it passed the max psi. lol I have to flip the fuse to make it stop... and I'll have to wait til after my trip to Vancouver to start looking into it... I think mine, well, hope, mine's just wiring. lol Good luck