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Hi my name is Robert.....
Sometimes you need to prime the line that is going into the jug OR the water pump can get air bound, try and get a funnel, pre-fill the line and then see if you get flow. IF not put your line in the jug go to the outlet of the water pump loosen the connector and briefly turn the pump on, doing this will make sure the pump is not air bound, make sure you open ALL the faucets inside as well, as the all the antifreeze gets pumped through the system it should push air out first then you should get flow. Also make sure you have good battery voltage, if the voltage was under 11 volts the pump would still run but might not produce anything. Let me know if you still need more help....... Follow ups are included... Robert