Foot pump windshield washer

Hey Does anyone know how to prime the foot pump for a windshield washer . Mine is a 69 dart style. When I did the V8 swap I took the lines off for the squirters to pain the motor compartment. ever since I put it back together I can only get a little sprits of water to come out with pumping the foot pump. I tried to take the made water feed off the tank and blew threw it and got a nice stream to both sides of the windshield. Now I tried to pump the foot pump back full of water and no go, it just gurgles air any suggestions? Thanks Ted