Hi Roger. It sounds like the float isn't positioned right. Unscrew the anti-syphon cap. Make sure the plastic float is centered on the pin and the black rubber washer is there. Also the Dig anti-syphon adapters flow is controled by turning the adapter itself counter-clockwise. If it's not open far enough it can give the impression of coming on but wont have enough force to seal the float thus the water bubbles out. Good luck!
If I can't fix it, it's broken!