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Are you re-using the same output assembly (output fitting, spring, pin, etc...) when you switch the pumps? Just trying to figure out what is in common between all the failed pumps, and wondering if maybe the pressure bypass is sticking. I've had it stick open on mine, meaning it was just bypassing all of the pressure and felt like the pump died. I could also see it be stuck closed and not bypass which could also kill the pump.
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