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Discussion Starter #1 (Edited)
I have a pump with about 8ft of verticle rise available,i looped it at top but it wont climb that little rise through the 3/8th tube then it starts to leak out of inlet side of pump, any ideas? Thank you.
 

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Junk pump -- replace the pump
 

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install a check valve right out of the pump discharge and get rid of that loop
There's not enough power in the pump to lift the water up to that height, and now it must push a check valve open also? Any fitting attached along the line is considered a flow restrictor and will reduce outlet velocity.
 
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