Had the same thing happen to me about two years ago. Turns out that the pump was bad and leaked water when you first energized the system. I bought a new pump and installed it. Reading the installation instructions, it told you not to connect the pump directly to the plastic pipe, but to run a short hose connection from the pump to the pipe. Hooking it directly can lead to excessive vibration and damage the pump. Thor had connected the pump directly to the pipe, destroying the pump.
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