the main drawback i see to a fluid transfer pump versus a bilge pump, is that a bilge is meant to operate in much worse conditions than a transfer pump. the bilge will hold up better to being bounced around in an atv and also to pumping dirty water. the bilge has a screen to keep out the large debris, and the bilge pump has bigger clearances to allow the small stuff to pass through (also why they pump a bit slower)
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