foot pump windsheild washer

Can anyone tell me why my foot pump washer doesn't work?
It worked fine till I changed the engine and painted the engine compartment.
Do I have to reprime the system to get it to work after three months ? It worked fine when I removed it? If I remove the water line off the tank and blow into it water squirts onto the windshield. I have been messing with it and can't quite figure out whats wrong? Thanks