Dave has the right pump. I don't think that Sanger ever used Tsunami pumps but I could be wrong every one I have seen that used aerator pump uses the Shurflo piranha. Typically what causes the pump not to work is an air lock. Had this problem with my starboard pump. Make sure all the fittings are tight (valve, street fitting pump to valve) use plenty of Teflon tape on fittings. Remove motor from housing and apply a little marine grease or Vaseline to the o-ring and reinstall. Make sure nut is tight and reinstall keeper. Finally make sure that discharge hose keeps a gradual up angle from pump to the tank. If the pump is above the hose then air will get caught in the pump. These pumps are not self priming so if there is air in the pump then it will not work. By the way my problem was that my pump was above the hose. Just had to install some small spacers under the clamps to get hose off floor, problem solved.
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