Only the impeller pumps will prime, the JABSCO will put out 540 GPH, and the new Johnsons I believe are 740 GPH. On my supra, I drain the bags with Tsunami 800's and it works fine, plus you can run them dry all day long and they wont burn up. $30 for a Tsunami, $200+ for the Jabsco/Johnson.
When people use Impeller pumps, they will use them to fill and drain.
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