One screen washer not working on XK8 (2005 model). I checked and no fluid is coming out of the left hand outlet mounted on top of the bulkhead - the right hand jet is fine. Any ideas would be welcomed.

 

Small bits of debris can clog the tiny spray nozzle hole. A small sewing needle may be able to clear it. You may also need to detach the hose from the spray nozzle and clean it from both directions....

 

The washer bottle reservoir is behind the front left wheel well liner. Small diameter hoses connect the pump to the bulkhead and the wipers so maybe they’re just blocked. Try blowing them out.

At a pinch use any kitchen / bathroom cleaning solution ie Jif/Cif to dissolve any lime/crud blockage in the hoses.