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Tank level too low to prime Pump1. Pump2 primes Pump1. So far OK. Pump1 turns on, and both for recirculation and taking some load off Pump2. Probably OK thanks to recirculation making up flow difference. Pump2 turns off. This is where things get a little hairy since Pump1 might actually end up driving Pump2 and Pump2 may not handle that. solution is a ...

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