My passenger wiper no longer sprays. I suspect there is a hose disconnected somewhere and in fact, there is a downspout-type thing in front of the passenger wiper joint that looks like it should have tubing attached (similar to the driver side) but I can't find any diagram showing the tubing layout. Can anyone help? I don't think there is a clog, but I'll try that if anyone can offer assistance. Anyone know if the tube that connects to the passenger side is visible just like the driver side (once the hood is lifted)?

 

Below is the downspout I referred to in my original post. What is this?

 

I suspect the tube you show in the photo is a drain tube for the wiper box ??

I've attached a couple of diagrams from the XK (X150) Workshop manual that might help, but it doesn't address your problem specifically.
I'd suggest disconnecting the passenger-side tube and blowing thru it ??

 

Thank you for the diagrams. Worked on the car yesterday and found the problem was a disconnected tube. The spout in the photo I posted is not a spout at all but rather a mounting screw to hold the plastics down. We were able to pry up the plastic at the base of the windshield just enough to fish out the tubing with needle-nose pliers and reattach. Works like a charm again!