Rosco's Reefs December 5, 2011 Share December 5, 2011 I purchased an external pump for a water movement system I am designing and after pulling out my hair (and I'm bald already) I called Tech Support. They guy there told me this particular pump (a panworld from BRS) required priming before it would pump... After I fussed about lack of documentation, etc. etc., he said just about all external pumps are this way... Is this true? As with many of my grand designs, if true, it will be back to the drawing board. Did I say in an earlier post that the DIY was my favorite part of the hobby? I take it back! Thx WAMAS! Link to comment Share on other sites More sharing options...
Jon Lazar December 5, 2011 Share December 5, 2011 Most hobby level pumps are centrifugal, which can't pull enough air through to self prime. We get around this by normally mounting the pump low enough that the water from the sump fills the pump, even when it's off. Link to comment Share on other sites More sharing options...
Coral Hind December 5, 2011 Share December 5, 2011 Can you detail the situation so we can maybe offer a fix? Link to comment Share on other sites More sharing options...
Guest thefishman65 December 5, 2011 Share December 5, 2011 i agree details there should be a fix. Maybe the first time it needs to be primed, but after that if you leave it with some water you should be ok. Link to comment Share on other sites More sharing options...
jtro December 5, 2011 Share December 5, 2011 To prime mine at first I had to back fill some water down the output line .Then when I felt it was enough it started up perfectly ! Link to comment Share on other sites More sharing options...
Origami December 6, 2011 Share December 6, 2011 Most hobby level pumps are centrifugal, which can't pull enough air through to self prime. We get around this by normally mounting the pump low enough that the water from the sump fills the pump, even when it's off. +1 If you provide a drawing of your setup, maybe we could give more help. In any case, you need to get the air out of the intake side of the pump to give the impeller something to "bite" on. You can do this by pumping water up into the intake, or by drawing air out of the intake. Either way should work, but you need to get the air out. Link to comment Share on other sites More sharing options...
Rosco's Reefs December 6, 2011 Author Share December 6, 2011 Thx all. I will draw it up, write it up and post it. Link to comment Share on other sites More sharing options...
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