Vacuum level issues with water jet vacuum pumps

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The water-jet vacuum pump PSJ-280 has a vacuum level of 0.098 MPa; currently, its water tank has cracked. There are two issues that need to be resolved with everyone’s help! The first issue is the rupture of the water tank. I identify two possible causes: one is a pressure problem inside the tank, with excessive pressure building up; but if the pressure is indeed too high, it should cause the tank to collapse inward ； Another issue is related to the foundation embedments, which are severely rotten; please help analyze the reasons! The second issue is that with another identical vacuum pump, a new pump of the same model was installed after the original water pump was damaged. The pump operates normally, but the vacuum level doesn’t increase – what could be the reason? I’m asking for help in analyzing this issue. As far as I know, similar symptoms occurred a long time ago, and the problem was resolved by replacing the liquid in the water tank; I don’t think that’s the cause here, as the water in the tank is circulating water of ordinary material. So please help analyze what could be the reason