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Hi my name is Robert.....
Click HERE and have a look that would be how to adjust the pump if you have that screw. IF not make sure your inlet side is tight, if the inlet was loose or you had a cracked fitting then the water pump would suck air and cause it to cycle..... Hope this helps some... Robert
Hi was just checking in to see if my answer helped??? IF you have more questions or concerns please feel free to contact me..
I might contact shurflo directly and see if they would warrant that new pump, possible you got a bad pump, have seen that before right out of the box. Click HERE for the contact info, they are normally pretty good on warranty with there pumps, but maybe they would have some more input as well..... Robert